WO2014144864A1 - Performance optimization of data transfer for soft information generation - Google Patents

Performance optimization of data transfer for soft information generation Download PDF

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Publication number
WO2014144864A1
WO2014144864A1 PCT/US2014/029453 US2014029453W WO2014144864A1 WO 2014144864 A1 WO2014144864 A1 WO 2014144864A1 US 2014029453 W US2014029453 W US 2014029453W WO 2014144864 A1 WO2014144864 A1 WO 2014144864A1
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Prior art keywords
data values
buffer
read operations
storage medium
read
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PCT/US2014/029453
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French (fr)
Inventor
Jack Edward FRAYER
Aaron K. OLBRICH
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Sandisk Enterprise Ip Llc
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Priority to KR1020157024578A priority Critical patent/KR101982381B1/en
Priority to CN201480015991.9A priority patent/CN105264496B/en
Publication of WO2014144864A1 publication Critical patent/WO2014144864A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
    • G06F3/061—Improving I/O performance
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1008—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices
    • G06F11/1048—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using arrangements adapted for a specific error detection or correction feature
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
    • G06F3/0659—Command handling arrangements, e.g. command buffers, queues, command scheduling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0673—Single storage device
    • G06F3/068—Hybrid storage device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/3723—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35 using means or methods for the initialisation of the decoder
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/3769—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35 using symbol combining, e.g. Chase combining of symbols received twice or more
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • H03M13/45—Soft decoding, i.e. using symbol reliability information

Abstract

A single command initiates a first read operation and sequence of one or more additional read operations from the same portion of memory. The one or more additional read operations are terminable after the first read operation provides a first plurality of data values that is made available to a requesting device and/or module. In some implementations, the first plurality of data values includes hard information values. Subsequent pluralities of data values are generated from the same portion of memory until a terminating event occurs. In some implementations, until a terminating event occurs, a respective hybrid plurality of data values is generated by combining the latest read plurality of data values with one of a previously generated hybrid plurality of data values and the first plurality of data values. Each hybrid plurality of data values is representative of a corresponding plurality of soft information values.

Description

Performance Optimization of Data Transfer for Soft Information Generation
TECHNICAL FIELD
[0001] This disclosure relates to error control in memory systems, and in particular, to managing data that is used for soft information error control decoding.
BACKGROUND
[0002] Semiconductor memory devices, including flash memory, typically utilize memory cells to store data as an electrical value, such as an electrical charge or voltage. A flash memory cell, for example, includes a single transistor with a floating gate that is used to store a charge representative of a data value. Increases in storage density have been facilitated in various ways, including increasing the density of memory cells on a chip enabled by manufacturing developments, and transitioning from single-level flash memory cells to multi-level flash memory cells, so that two or more bits can be stored by each flash memory cell.
[0003] A drawback of increasing storage density is that the stored data is increasingly prone to being stored and/or read erroneously. An error control coding (ECC) engine is utilized to limit the number of uncorrectable errors that are introduced by electrical fluctuations, defects in the storage medium, operating conditions, device history, and/or write-read circuitry, etc. Additionally, for many error control codes, the decoding process can be improved by using soft information, which takes into account the associated probabilities of different interpretations of the results of one or more read operations. Hard information decoding generally means that an absolute decision is made as to whether a data value is one value or another. By contrast, soft information includes the probabilities that different interpretations of sensed electrical signals, corresponding to the results of one or more read operations, may be correct. By taking into consideration more information, soft information decoding often improves the error detection and correction capability of a particular error control code, and thus the data storage capacity of a system. However, the utilization of soft information decoding has a number of previously irresolvable drawbacks. For example, soft information decoding implementations tend to introduce undesirable delays (i.e., latencies), have relatively large semiconductor footprints, and are generally power and memory intensive. SUMMARY
[0004] Various implementations of systems, methods and devices within the scope of the appended claims each have several aspects, no single one of which is solely responsible for the attributes described herein. In one aspect, a single command initiates a first read operation and sequence of one or more additional read operations from the same portion of memory. This facilitates timely production of hard and then soft information values representative of data stored in a storage medium.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] So that the present disclosure can be understood in greater detail, a more particular description may be had by reference to the features of various implementations, some of which are illustrated in the appended drawings. The appended drawings, however, merely illustrate the more pertinent features of the present disclosure and are therefore not to be considered limiting, for the description may admit to other effective features.
[0006] Figure 1 is a diagram of an implementation of a data storage system, in accordance with some embodiments.
[0007] Figure 2 is a diagram of an implementation of a data storage system, including elements operable to produce soft information responsive to a command structure that facilitates timely production of hard and then soft information values from multiple read operations, in accordance with some embodiments.
[0008] Figure 3 is a diagram of an implementation of the soft information generation module included in Figure 2, in accordance with some embodiments.
[0009] Figure 4 is a flowchart representation of an implementation of a method of delivering read data as hard and then soft information values responsive to a command structure that facilitates timely production of hard and soft information from multiple read operations, in accordance with some embodiments.
[0010] Figure 5 is a flowchart representation of an implementation of a method of delivering read data as hard and then soft information values responsive to a command structure that facilitates timely production of hard and soft information from multiple read operations, in accordance with some embodiments.
[0011] In accordance with common practice the various features illustrated in the drawings may not be drawn to scale. Accordingly, the dimensions of the various features may be arbitrarily expanded or reduced for clarity. In addition, some of the drawings may not depict all of the components of a given system, method or device. Finally, like reference numerals may be used to denote like features throughout the specification and figures.
DETAILED DESCRIPTION
[0012] As noted above, a drawback to employing soft information decoding is that previously available efforts tend to introduce undesirable delays (i.e., latencies), have relatively large semiconductor footprints, and are generally power and memory intensive. By contrast, the various implementations described herein provide a command structure and method of operation responsive to the command structure that facilitates timely production of hard and then soft information values representative of data stored in a storage medium.
[0013] Some implementations include a command structure that initiates a first read operation and then a sequence of one or more additional read operations from the same portion of memory as the first read operation. The one or more additional read operations are terminable after the first read operation provides a first plurality of data values, and the first plurality of data values is made available to a requesting device and/or module. In some implementations, the first plurality of data values includes hard information values.
Subsequent pluralities of data values are generated by the subsequent read operations until a terminating event occurs. In some implementations, so long as performance of the one or more additional read operations has not been terminated, in response to the completion of each of the one or more additional read operations, a respective hybrid plurality of data values is generated by combining the latest read plurality of data values with one of a previously generated hybrid plurality of data values and the first plurality of data values. As used in the present disclosure, a hybrid plurality of data values is representative of a corresponding plurality of soft information values produced from two or more read operations from the same portion of memory.
[0014] More specifically, some implementations include a method for reading from a storage medium. In some implementations, the method includes receiving from a requesting device a control command of a first type. The method further includes responding to receiving the control command of the first type by (1) performing a first read operation, using a first reading signal value, to obtain a first plurality of data values from a portion of the storage medium, (2) after performing the first read operation, initiating performance of one or more additional read operations, each additional read operation using a respective reading signal value different from the first reading signal value to obtain a subsequent plurality of data values from the same portion of the storage medium as the first read operation, and (3) terminating performance of the one or more additional read operations upon the earlier of completion of a predefined number of the additional read operations and receiving a subsequent control command.
[0015] In some embodiments, the subsequent control command is of a type that causes termination of the one or more additional read operations.
[0016] In some embodiments, the method further includes storing the first plurality of data values in a buffer, transferring the first plurality of data values from the buffer to the requesting device, and initiating performance of a first additional read operation of the one or more additional read operations during a time period that overlaps with the transfer of the first plurality of data values from the buffer to the requesting device.
[0017] In some embodiments, the method further includes storing the first plurality of data values in a buffer, setting a status bit that is configured for reading by the requesting device, and initiating performance of a first additional read operation of the one or more additional read operations at a time period proximate to a time that the status bit is set.
[0018] In some embodiments, so long as performance of the one or more additional read operations has not been terminated, the method includes generating, in response to a completion of each of the one or more additional read operations, a respective hybrid plurality of data values by combining the latest read plurality of data values with one of a previously generated hybrid plurality of data values and the first plurality of data values.
[0019] In some embodiments, the method further includes receiving from a requesting device a control command of a second type, wherein the second type differs from the first type by indicating a request for a single read of a respective portion of the storage medium. The method further includes responding to receiving the control command of the second type by (1) performing a single read operation to obtain data values from a portion of the storage medium, (2) storing the obtained data values in a buffer, and (3) transferring the obtained data values from the buffer to the requesting device.
[0020] In some embodiments, the one or more additional read operations is limited to a predefined number of read operations.
[0021] In some embodiments, initiating performance of one or more additional read operations occurs in response to a first condition. In some embodiments, the first condition includes receiving a message indicating that the first plurality of data values could not be decoded. In some embodiments, the first condition includes determining that a message, that indicates that the first plurality of data values can be decoded successfully, has not been received within a first duration. In some embodiments, the first condition includes determining that a message, that indicates that the first plurality of data values has been successfully decoded, has not been received within a first duration.
[0022] In some embodiments, the method further includes storing the first plurality of data values in a buffer, and transmitting a first message indicating that the first plurality of data values is available to be read from the buffer.
[0023] In some embodiments, the method further includes storing each respective hybrid plurality of data values in the buffer by overwriting any previously generated hybrid plurality of data values stored in the buffer, and transmitting a subsequent message indicating that a new hybrid plurality of data values is available to be read from the buffer each time a hybrid plurality of data values is newly stored in the buffer.
[0024] In some embodiments, generating each respective hybrid plurality of data values includes an exclusive-or (XOR) between each of the latest read of the one or more subsequent pluralities of data values and one of a previously generated hybrid plurality of data values and the first plurality of data values.
[0025] In another aspect, a device operable to read from a storage medium is configured to read data in accordance with any of the methods described above.
[0026] In some implementations, with respect to any of the methods described above, a device operable to read from a storage medium includes a storage medium and a controller configured to read data in accordance with any of the methods described above.
[0027] Numerous details are described herein in order to provide a thorough understanding of the example implementations illustrated in the accompanying drawings. However, some embodiments may be practiced without many of the specific details, and the scope of the claims is only limited by those features and aspects specifically recited in the claims. Furthermore, well-known methods, components, and circuits have not been described in exhaustive detail so as not to unnecessarily obscure more pertinent aspects of the implementations described herein.
[0028] Figure 1 is a diagram of an implementation of a data storage system 100, in accordance with some embodiments. While some example features are illustrated, various other features have not been illustrated for the sake of brevity and so as not to obscure more pertinent aspects of the example implementations disclosed herein. To that end, as a non- limiting example, data storage system 100 includes a memory controller 120, and a storage medium 130, and is used in conjunction with computer system 110. In some
implementations, storage medium 130 is a single flash memory device while in other implementations storage medium 130 includes a plurality of flash memory devices. In some implementations, storage medium 130 is NAND-type flash memory or NOR-type flash memory. Further, in some implementations memory controller 120 is a solid-state drive (SSD) controller. However, other types of storage media may be included in accordance with aspects of a wide variety of implementations.
[0029] Computer system 110 is coupled to memory controller 120 through data connections 101. However, in some implementations computer system 110 includes memory controller 120 as a component and/or a sub-system. Computer system 110 may be any suitable computer device, such as a computer, a laptop computer, a tablet device, a netbook, an internet kiosk, a personal digital assistant, a mobile phone, a smart phone, a gaming device, a computer server, or any other computing device. Computer system 110 is sometimes called a host or host system. In some implementations, computer system 110 includes one or more processors, one or more types of memory, a display and/or other user interface components such as a keyboard, a touch screen display, a mouse, a track-pad, a digital camera and/or any number of supplemental devices to add functionality.
[0030] Storage medium 130 is coupled to memory controller 120 through connections
103. Connections 103 are sometimes called data connections, but typically convey commands in addition to data, and optionally convey metadata, error correction information and/or other information in addition to data values to be stored in storage medium 130 and data values read from storage medium 130. In some implementations, however, memory controller 120 and storage medium 130 are included in the same device as components thereof. Furthermore, in some implementations memory controller 120 and storage medium 130 are embedded in a host device, such as a mobile device, tablet, other computer or computer controlled device. Storage medium 130 may include any number (i.e., one or more) of memory devices including, without limitation, non-volatile semiconductor memory devices, such as flash memory. For example, flash memory devices can be configured for enterprise storage suitable for applications such as cloud computing, or for caching data stored (or to be stored) in secondary storage, such as hard disk drives. Additionally and/or alternatively, flash memory can also be configured for relatively smaller-scale applications such as personal flash drives or hard-disk replacements for personal, laptop and tablet computers.
[0031] Storage medium 130 is divided into a number of addressable and individually selectable blocks, such as selectable portion 131. In some implementations, the individually selectable blocks are the minimum size erasable units in a flash memory device. In other words, each block contains the minimum number of memory cells that can be erased simultaneously. Each block is usually further divided into a plurality of pages and/or word lines, where each page or word line is typically an instance of the smallest individually accessible (readable) portion in a block. In some implementations (e.g., using some types of flash memory), the smallest individually accessible unit of a data set, however, is a sector, which is a subunit of a page. That is, a block includes a plurality of pages, each page contains a plurality of sectors, and each sector is the minimum unit of data for reading data from the flash memory device.
[0032] For example, one block comprises any number of pages, for example, 64 pages, 128 pages, 256 pages, or another suitable number of pages. Blocks are typically grouped into a plurality of zones. Each block zone can be independently managed to some extent, which increases the degree of parallelism for parallel operations and simplifies management of storage medium 130.
[0033] As noted above, while data storage densities of non-volatile semiconductor memory devices are generally increasing, a drawback of increasing storage density is that the stored data is more prone to being stored and/or read erroneously. As described in greater detail below, error control coding can be utilized to limit the number of uncorrectable errors that are introduced by electrical fluctuations, defects in the storage medium, operating conditions, device history, write-read circuitry, etc., or a combination of these and various other factors.
[0034] In some implementations, memory controller 120 includes a management module 121, an input buffer 123, an output buffer 124, an error control module 125 and a storage medium interface (I/O) 128. Memory controller 120 may include various additional features that have not been illustrated for the sake of brevity and so as not to obscure more pertinent features of the example implementations disclosed herein, and that a different arrangement of features may be possible. Input and output buffers 123,124 provide an interface to computer system 110 through data connections 101. Similarly, storage medium I/O 128 provides an interface to storage medium 130 though connections 103. In some implementations, storage medium I/O 128 includes read and write circuitry, including circuitry capable of providing reading signals to storage medium 130 (e.g., reading threshold voltages for NAND-type flash memory).
[0035] In some implementations, management module 121 includes one or more processing units (CPUs, also sometimes called processors) 122 configured to execute instructions in one or more programs (e.g., in management module 121). In some
implementations, the one or more CPUs 122 are shared by one or more components within, and in some cases, beyond the function of memory controller 120. Management module 121 is coupled to input buffer 123, output buffer 124 (connection not shown), error control module 125 and storage medium I/O 128 in order to coordinate the operation of these components.
[0036] Error control module 125 is coupled to storage medium I/O 128, input buffer
123 and output buffer 124. Error control module 125 is provided to limit the number of uncorrectable errors inadvertently introduced into data. In some embodiments, error control module 125 is executed in software by the one or more CPUs 122 of management module 121, and, in other embodiments, error control module 125 is implemented in whole or in part using special purpose circuitry to perform encoding and decoding functions. To that end, error control module 125 includes an encoder 126 and a decoder 127. Encoder 126 encodes data by applying an error control code to produce a codeword, which is subsequently stored in storage medium 130.
[0037] When the encoded data (e.g., one or more codewords) is read from storage medium 130, decoder 127 applies a decoding process to the encoded data to recover the data, and to correct errors in the recovered data within the error correcting capability of the error control code. Those skilled in the art will appreciate that various error control codes have different error detection and correction capacities, and that particular codes are selected for various applications for reasons beyond the scope of this disclosure. As such, an exhaustive review of the various types of error control codes is not provided herein. Moreover, those skilled in the art will appreciate that each type or family of error control codes may have encoding and decoding algorithms that are particular to the type or family of error control codes. On the other hand some algorithms, such as the Viterbi algorithm, may be utilized at least to some extent in the decoding of a number of different types or families of error control codes. As such, for the sake of brevity, an exhaustive description of the various types of encoding and decoding algorithms generally available and known to those skilled in the art is not provided herein.
[0038] During a write operation, input buffer 123 receives data to be stored in storage medium 130 from computer system 110. The data held in input buffer 123 is made available to encoder 126, which encodes the data to produce one or more codewords. The one or more codewords are made available to storage medium I/O 128, which transfers the one or more codewords to storage medium 130 in a manner dependent on the type of storage medium being utilized.
[0039] A read operation is initiated when computer system (host) 110 sends one or more host read commands on control line 111 to memory controller 120 requesting data from storage medium 130. Memory controller 120 sends one or more read access commands to storage medium 130, via storage medium I/O 128, to obtain raw read data in accordance with memory locations (addresses) specified by the one or more host read commands. Storage medium I/O 128 provides the raw read data (e.g., comprising one or more codewords) to decoder 127. If the decoding is successful, the decoded data is provided to output buffer 124, where the decoded data is made available to computer system 110. In some implementations, if the decoding is not successful, memory controller 120 may resort to a number of remedial actions or provide an indication of an irresolvable error condition.
[0040] Flash memory devices utilize memory cells to store data as electrical values, such as electrical charges or voltages. Each flash memory cell typically includes a single transistor with a floating gate that is used to store a charge, which modifies the threshold voltage of the transistor (i.e., the voltage needed to turn the transistor on). The magnitude of the charge, and the corresponding threshold voltage the charge creates, is used to represent one or more data values. In some implementations, during a read operation, a reading threshold voltage is applied to the control gate of the transistor and the resulting sensed current or voltage is mapped to a data value.
[0041] The terms "cell voltage" and "memory cell voltage," in the context of flash memory cells, means the threshold voltage of the memory cell, which is the minimum voltage that needs to be applied to the gate of the memory cell's transistor in order for the transistor to conduct current. Similarly, reading threshold voltages (sometimes also called reading signals and reading voltages) applied to a flash memory cells are gate voltages applied to the gates of the flash memory cells to determine whether the memory cells conduct current at that gate voltage. In some im lementations, when a flash memory cell's transistor conducts current at a given reading threshold voltage, indicating that the cell voltage is less than the reading threshold voltage, the raw data value for that read operation is a "1" and otherwise the raw data value is a "0."
[0042] In some implementations, the memory cell voltage of a memory cell is read indirectly, by reading the memory cell using one or more reading threshold voltages. More specifically, each read operation produces a result that indicates whether the cell voltage of the memory cell is greater than or less than the reading threshold voltage used during that read operation. By reading the memory cell using multiple reading threshold voltages, the cell voltage can be determined more precisely than if the memory cell were read using only a single reading threshold voltage. Stated another way, the more read operations that are performed on a memory cell, each using a different reading threshold voltage, the more precisely the cell voltage of the memory cell is known.
[0043] Figure 2 is a diagram of an implementation of a data storage system 200, including elements operable to produce soft information responsive to a command structure that facilitates timely production of hard and then soft information values from multiple read operations. Data storage system 200 illustrated in Figure 2 is similar to and adapted from data storage system 100 illustrated in Figure 1. Elements common to each include common reference numbers, and only the differences between Figures 1 and 2 are described herein for the sake of brevity. Moreover, while certain specific features are illustrated, various other features have not been illustrated for the sake of brevity and so as not to obscure more pertinent aspects of the example implementations disclosed herein.
[0044] With reference to Figure 2, as a non-limiting example, storage medium 230 generally comprises a memory chip. Those skilled in the art will appreciate from the present disclosure that, in various other implementations, storage medium 230 includes various other types of memory devices, including two or more memory chips. Storage medium 230 includes a NAND flash cell array 231, a write buffer 232, a chip controller 236, read-write (R/W) access circuitry 237, a page buffer 235, and a multiplexer (MUX) 234.
[0045] Storage medium I/O 128 is coupled to storage medium 230 through connections 103. Connections 103 are sometimes called data connections, but typically convey commands in addition to data, and optionally convey metadata, error correction information and/or other information in addition to data values to be stored in storage medium 130 and data values read from storage medium 230. More specifically, with continued reference to Figure 2, storage medium I/O 128 is coupled to deliver write data to write buffer 232, and also coupled to chip controller 236 to convey at least one of commands, metadata and representations of one or more reading signal values (e.g., reading threshold voltages). Chip controller 236 is coupled to provide control commands, including read and write commands, to R/W access circuitry 237. R/W access circuitry 237 is also coupled to receive (or retrieve) write data from write buffer 232.
[0046] R/W access circuitry 237 is also coupled to NAND flash cell array 231.
During a write operation, R W access circuitry 237 operates to write data from write buffer 232 into a selectable portion of NAND flash cell array 231, such as for example, selectable portion of flash array 231-1. During a read operation, R/W access circuitry 237 operates to read data stored in NAND flash cell array 231. Read data is copied into page buffer 235. Storage medium I/O 128 is also coupled to receive read data (as either hard or soft information values) through MUX 234. Data read from the NAND flash cell array 231 is stored in page buffer 235, and is made accessible to storage medium I/O 128 through MUX 234. Chip controller 236 provides a control signal to MUX 234 that allows the storage medium I/O 128 to access the read data in page buffer 235 through MUX 234. In turn, storage medium I/O 128 stores read data from buffer 235 in stage buffer 228.
[0047] Figure 3 is a diagram of an implementation of soft information generation module 229 included in Figure 2, in accordance with some embodiments. Again, as noted above, while certain specific features are illustrated, those skilled in the art will appreciate from the present disclosure that various other features have not been illustrated for the sake of brevity and so as not to obscure more pertinent aspects of the example implementations disclosed herein. To that end, as a non-limiting example, the soft information generation module 229 includes a soft information management controller 510, a characterization module 520, a calculation/adjustment module 530, and an output multiplex (MUX) 540. Soft information generation module 229 is coupled to decoder 127.
[0048] The soft information management controller 510 is coupled to each of the characterization module 520, calculation/adjustment module 530, and MUX 540 in order to coordinate the operation of soft information generation module 229. More specifically, in some implementations, soft information management controller 510 is connected to receive a read request and one or more storage medium characterization parameters on control and data lines 501 and 502, respectively. Soft information management controller 510 is also connected to provide characterization module 520 a selection control signal on control line 511, and to receive a selected characterization vector on data line 512. In some
implementations, soft information management controller 510 is further connected to provide reading threshold voltages to the storage medium I/O 128 via data line 514, and to receive raw read data from the storage medium I/O 128 on data line 515 by way of page buffer 235 (Figure 2) and multiplexer 234 (Figure 2). Soft information management controller 510 is also connected to provide sequences of soft information values to the calculation/adjustment module 530 and output MUX 540 via corresponding data lines 516 and 517, and a control signal to output MUX 540 via control line 503. Output MUX 540 is also connected to receive adjusted soft information values from calculation/adjustment module 530 on data line 531. Output MUX 540 is connected to selectively provide soft information values from one of conversion module 533 and calculation/adjustment module 530 on data line 541 depending on the control signal received on control line 503.
[0049] Characterization module 520 includes a collection of characterization vectors
521-1, 521-2, 521-3,... 521-n, that each store characterization data, such as soft information values for bit-tuples and read comparison signal values, associated with storage medium 130 for one or more storage medium characterization parameter values. In some
implementations, the characterization data stored in the characterization vectors 521 is statistically derived. Each combination of storage medium characterization parameter values represents a respective state of a storage medium that may be characterized in a device characterization process, and may exist for other devices produced by the same
manufacturing process
[0050] Soft information management controller 510 includes a selection module 531, an optional read controller 532, and a conversion module 533. Selection module 531 is configured to use the one or more storage medium characterization parameters values to select a characterization vector from the stored collection of characterization vectors 521-1, 521-2, 521-3,... 521-n in accordance with the current state of storage medium 130. The selection control signal includes one or more of storage medium characterization parameters values and/or an index key associated with a combination of one or more of storage medium characterization parameters values that enables characterization module 520 to select a characterization vector based on the one or more storage medium characterization parameters values associated with the current state of the storage medium 130. [0051] Optional read controller 532 is configured to read a portion of the storage medium 130 via storage medium I/O 128. In some implementations, read controller 532 is configured to provide storage medium I/O 128 with read comparison signal values for the read operation. In some implementations, read controller 532 selects one or more statistically determined read comparison signal values from a characterization vector selected based on the one or more storage medium characterization parameter values associated with the current state of storage medium 130.
[0052] Conversion module 533 is configured to generate a sequence of soft information values corresponding to raw hard-decision read data. The sequence of soft information values is generated, at least in part, by selecting a respective soft information value from the selected characterization vector for each bit-tuple of the raw hard-decision read data produced by a read operation using a corresponding reading threshold voltage value. More specifically, in some implementations, the conversion module 533 assigns at least one soft information value, in the form of a LLR, to each bit-tuple in the hard-decision read data to produce a corresponding sequence of LLRs yLLR = (y1, y2>—> yn-i where n is the codeword length.
[0053] Calculation/adjustment module 530 is configured to optionally adjust soft information values in response to one or more characterization parameter values associated with a current state of the storage medium and/or previously detected error characterizations.
[0054] Figure 4 is a flowchart representation of an implementation of a method 400 of delivering read data as hard and then soft information values responsive to a command structure that facilitates timely production of hard and then soft information values from multiple read operations. In some implementations, method 400 is performed by a chip controller associated with a memory cell array, such as chip controller 236 (shown in Figure 2). Briefly, method 400 includes responding to receiving a control command of a first type by initiating a first read operation and then a sequence of one or more additional read operations from the same portion of memory as the first read operation. The additional read operations are terminable after a first plurality of data values is provided to the requesting device.
[0055] To that end, as represented by block 4-1, method 400 includes receiving from a requesting device a control command of a first type. As represented by block 4- la, the control command of the first type instructs a receiving device to initiate a first read operation and then a sequence of one or more additional read operations from the same portion of memory as the first read operation. In other words, the control command of the first type is a continuous read command. For example, with reference to Figures 2 and 4, chip controller 236 receives a continuous read command transmitted from storage medium I/O 128.
[0056] As represented by block 4-2, method 400 includes, responding to receiving the control command of the first type by performing a first read operation, using a first reading signal value (e.g., reading threshold voltage), to obtain a first plurality of data values from a portion of the storage medium. For example, with continued reference to Figures 2 and 4, chip controller 236 provides a first read command and a first reading threshold voltage to R/W access circuitry 237. R/W access circuitry 237 operates to read a first plurality of data from NAND flash cell array 231. First plurality of data values read from NAND flash cell array 231 is copied into page buffer 235.
[0057] As represented by block 4-3, after performing the first read operation, method
400 includes further responding to receiving the control command of the first type by initiating performance of one or more additional read operations, each additional read operation using a respective reading signal value different from the first reading signal value to obtain a subsequent plurality of data values from the same portion of the storage medium as the first read operation. For example, with continued reference to Figures 2 and 4, chip controller 236 iteratively provides subsequent read commands and respective subsequent reading threshold voltages to R/W access circuitry 237. In response to receiving each subsequent read command and the respective subsequent reading threshold voltage, R/W access circuitry 237 operates to read a respective subsequent plurality of data from NAND flash cell array 231. Each respective subsequent plurality of data values read from NAND flash cell array 231 is copied into page buffer 235.
[0058] Additionally, in some implementations, initiating performance of one or more additional read operations occurs in response to a first condition. In some implementations, the first condition includes receiving a message indicating that the first plurality of data values could not be decoded. In some implementations, the first condition includes determining that a message, that indicates that the first plurality of data values can be decoded successfully, has not been received within a first duration. In some
implementations, the first condition includes determining that a message, that indicates that the first plurality of data values has been successfully decoded, has not been received within a first duration. [0059] As represented by block 4-4, method 400 includes determining whether an iteration limit has been reached. In some implementations, the iteration limit defines a limit on the number of one or more additional read operations that are performed in response to the control command of the first type. As such, the one or more additional read operations is limited to a predefined number of read operations. If the iteration limit has been reached ("Yes" path from block 4-4), method 400 terminates. On the other hand, if the iteration limit has not been reached ("No" path from block 4-4), as represented by block 4-5, method 400 includes determining if another command has been received. If another command has been received ("Yes" path from block 4-5), method 400 terminates. On the other hand, if another command has not been received ("No" path from block 4-4), method 400 loops back to the portion of the method represented by block 4-3 so that subsequent read operations can be performed as described. In some implementations, the subsequent control command is of a type that causes termination of the one or more additional read operations. In some implementations, any subsequently received control command signals the termination of the one or more additional read operations.
[0060] In some implementations, as represented by the combination of blocks 4-4 and
4-5, method 400 includes terminating performance of the one or more additional read operations upon the earlier of completion of a predefined number of the additional read operations and receiving a subsequent control command. Moreover, in some
implementations, the portions of method 400 represented by blocks 4-4 and 4-5 occur in the opposite order, or simultaneously with respect to one another. In some implementations the portions of method 400 represented by blocks 4-4 and 4-5 also occur simultaneously with the portion of method 400 represented by block 4-3, thereby enabling the one or more additional read operations to be terminable at any time after the first plurality of data values is made available to the requesting device and/or module.
[0061] Figure 5 is a flowchart representation of an implementation of a method 500 of delivering read data as hard and then soft information values responsive to a command structure that facilitates timely production of hard and then soft information values from multiple read operations, in accordance with some implementations. In some
implementations, method 500 is performed by a chip controller associated with a memory cell array, such as chip controller 236 (shown in Figure 2). Briefly, method 500 includes responding to receiving a control command of a first type by initiating a first read operation and then a sequence of one or more additional read operations from the same portion of memory as the first read operation. The additional read operations are terminable after a first plurality of data values is provided to the requesting device.
[0062] To that end, as represented by block 5-1, method 500 includes receiving from a requesting device a control command of a first type. In other words, the control command of the first type is a continuous read command. For example, with reference to Figures 2 and 5, chip controller 236 receives a continuous read command transmitted from storage medium I/O 128.
[0063] As represented by block 5-2, method 500 includes, responding to receiving the control command of the first type by performing a first read operation, using a first reading signal value, to obtain a first plurality of data values from a portion of the storage medium. For example, with continued reference to Figures 2 and 5, chip controller 236 provides a first read command and a first reading threshold voltage to R/W access circuitry 237. R W access circuitry 237 operates to read a first plurality of data from NAND flash cell array 231. First plurality of data values read from NAND flash cell array 231 is copied into page buffer 235.
[0064] As represented by block 5-3, method 500 includes storing the first plurality of data values in a buffer. For example, with continued reference to Figures 2 and 5, the first plurality of data values read from NAND flash cell array 231 is copied into page buffer 235. From the portion of the method represented by block 5-3, method 500 takes two operational paths that are performed proximate in time to one another and/or simultaneously. Along one path, as represented by block 5-4, method 500 includes facilitating transfer of the first plurality of data values to a requesting device. In some implementations, as represented by block 5 -4a, facilitating the transfer of the first plurality of data values to the requesting device includes setting a status bit that is configured for reading by the requesting device. For example, with continued reference to Figures 2 and 5, chip controller 236 sets a status bit that is readable by storage medium I/O 128 over connections 103. In some implementations, as represented by block 5-4b, facilitating the transfer of the first plurality of data values to the requesting device includes transferring the first plurality of data values from the buffer to the requesting device. For example, with continued reference to Figures 2 and 5, chip controller 236 provides MUX 234 with a drive signal that enables the MUX 234 to push the first plurality of data from page buffer 235 to storage medium I/O 128 in memory controller 120 over connections 103. [0065] Along another path, as represented by block 5-5, after performing the first read operation, method 500 includes further responding to receiving the control command of the first type by initiating performance of an additional read operation using a respective reading signal value different from the first reading signal value to obtain a subsequent plurality of data values from the same portion of the storage medium as the first read operation. For example, with continued reference to Figures 2 and 5, chip controller 236 iteratively provides subsequent read commands and respective subsequent reading threshold voltages to R/W access circuitry 237. In response to receiving each subsequent read command and the respective subsequent reading threshold voltage, R/W access circuitry 237 operates to read a respective subsequent plurality of data from NAND flash cell array 231. Each respective subsequent plurality of data values read from NAND flash cell array 231 is copied into page buffer 235. In some implementations, method 500 includes initiating performance of a first additional read operation of the one or more additional read operations during a time period that overlaps with the transfer of the first plurality of data values from the buffer to the requesting device. In some implementations, method 500 includes initiating performance of a first additional read operation of the one or more additional read operations at a time period proximate to a time that the status bit is set.
[0066] Additionally, in some implementations, initiating performance of one or more additional read operations occurs in response to a first condition. In some implementations, the first condition includes receiving a message indicating that the first plurality of data values could not be decoded. In some implementations, the first condition includes determining that a message, that indicates that the first plurality of data values can be decoded successfully, has not been received within a first duration. In some
implementations, the first condition includes determining that a message, that indicates that the first plurality of data values has been successfully decoded, has not been received within a first duration.
[0067] As represented by block 5-6, method 500 includes storing each additional plurality of data values in a buffer. For example, with further reference to Figures 2 and 5, each respective subsequent plurality of data values read from NAND flash cell array 231 is copied into page buffer 235. As represented by block 5-7, method 500 includes generating a hybrid plurality of data values in the buffer. In other words, in some implementations, so long as performance of the one or more additional read operations has not been terminated, method 500 includes generating, in response to a completion of each of the one or more additional read operations, a respective hybrid plurality of data values by combining the latest read plurality of data values with one of a previously generated hybrid plurality of data values and the first plurality of data values. In some implementations, method 500 also includes storing each respective hybrid plurality of data values in the buffer by overwriting any previously generated hybrid plurality of data values stored in the buffer. In some
implementations, generating each respective hybrid plurality of data values includes an exclusive-or (XOR) between each of the latest read of the one or more subsequent pluralities of data values and one of a previously generated hybrid plurality of data values and the first plurality of data values.
[0068] As represented by block 5-8, method 500 includes facilitating transfer of the hybrid plurality of data values to the requesting device. In some implementations, facilitating transfer of the hybrid plurality of data values to the requesting device by transmitting a first message indicating that the first plurality of data values is available to be read from the buffer. In some implementations, facilitating transfer of the hybrid plurality of data values to the requesting device by transmitting a subsequent message indicating that a new hybrid plurality of data values is available to be read from the buffer each time a hybrid plurality of data values is newly stored in the buffer.
[0069] As represented by block 5-9, method 500 includes determining whether an iteration limit has been reached. In some implementations, the iteration limit defines a limit on the number of one or more additional read operations that are performed in response to the control command of the first type. If the iteration limit has been reached ("Yes" path from block 5-9), method 500 terminates. On the other hand, if the iteration limit has not been reached ("No" path from block 5-9), as represented by block 5-10, method 500 includes determining if another command has been received. If another command has been received ("Yes" path from block 5-10), method 500 terminates. On the other hand, if another command has not been received ("No" path from block 5-10), method 500 loops back to the portion of the method represented by block 5-5 so that subsequent read operations can be performed as described. In some implementations, the subsequent control command is of a type that causes termination of the one or more additional read operations. In some implementations, any subsequently received control command signals the termination of the one or more additional read operations.
[0070] In some implementations, as represented by the combination of blocks 5-9 and
5-10, method 500 includes terminating performance of the one or more additional read operations upon the earlier of completion of a predefined number of the additional read operations and receiving a subsequent control command. Moreover, in some
implementations, the portions of method 500 represented by blocks 5-9 and 5-10 occur in the opposite order, or simultaneously with respect to one another. In some implementations the portions of method 500 represented by blocks 5-9 and 5-10 also occur simultaneously with the portion of method 500 represented by block 5-5, thereby enabling the one or more additional read operations to be terminable at any time after the first plurality of data values is made available to the requesting device and/or module.
[0071] It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first contact could be termed a second contact, and, similarly, a second contact could be termed a first contact, which changing the meaning of the description, so long as all occurrences of the "first contact" are renamed consistently and all occurrences of the second contact are renamed consistently. The first contact and the second contact are both contacts, but they are not the same contact.
[0072] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the claims. As used in the description of the embodiments and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
[0073] As used herein, the term "if may be construed to mean "when" or "upon" or
"in response to determining" or "in accordance with a determination" or "in response to detecting," that a stated condition precedent is true, depending on the context. Similarly, the phrase "if it is determined [that a stated condition precedent is true]" or "if [a stated condition precedent is true]" or "when [a stated condition precedent is true]" may be construed to mean "upon determining" or "in response to determining" or "in accordance with a determination" or "upon detecting" or "in response to detecting" that the stated condition precedent is true, depending on the context.
[0074] The foregoing description, for purpose of explanation, has been described with reference to specific implementations. However, the illustrative discussions above are not intended to be exhaustive or to limit the claims to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings. The
implementations were chosen and described in order to best explain principles of operation and practical applications, to thereby enable others skilled in the art.

Claims

What is claimed is:
1. A method of reading from a storage medium, the method comprising:
receiving from a requesting device a control command of a first type;
responding to receiving the control command of the first type by:
performing a first read operation, using a first reading signal value, to obtain a first plurality of data values from a portion of the storage medium;
after performing the first read operation, initiating performance of one or more additional read operations, each additional read operation using a respective reading signal value different from the first reading signal value to obtain a subsequent plurality of data values from the same portion of the storage medium as the first read operation; and
terminating performance of the one or more additional read operations upon the earlier of completion of a predefined number of the additional read operations and receiving a subsequent control command.
2. The method of claim 1, wherein the subsequent control command is of a type that causes termination of the one or more additional read operations.
3. The method of claim 1, further comprising:
storing the first plurality of data values in a buffer;
transferring the first plurality of data values from the buffer to the requesting device; and
initiating performance of a first additional read operation of the one or more additional read operations during a time period that overlaps with the transfer of the first plurality of data values from the buffer to the requesting device.
4. The method of claim 1, further comprising:
storing the first plurality of data values in a buffer;
setting a status bit that is configured for reading by the requesting device; and initiating performance of a first additional read operation of the one or more additional read operations at a time period proximate to a time that the status bit is set.
5. The method of claim 1, wherein so long as performance of the one or more additional read operations has not been terminated, the method includes generating, in response to a completion of each of the one or more additional read operations, a respective hybrid plurality of data values by combining the latest read plurality of data values with one of a previously generated hybrid plurality of data values and the first plurality of data values.
6. The method of claim 1, further comprising:
receiving from a requesting device a control command of a second type, wherein the second type differs from the first type by indicating a request for a single read of a respective portion of the storage medium;
responding to receiving the control command of the second type by:
performing a single read operation to obtain data values from a portion of the storage medium;
storing the obtained data values in a buffer; and transferring the obtained data values from the buffer to the requesting device.
7. The method of any of claims 1-5, wherein the one or more additional read operations is limited to a predefined number of read operations.
8. The method of any of claims 1-5, wherein initiating performance of one or more additional read operations occurs in response to a first condition.
9. The method of claim 8, wherein the first condition includes receiving a message indicating that the first plurality of data values could not be decoded.
10. The method of claim 8, wherein the first condition includes determining that a message, that indicates that the first plurality of data values can be decoded successfully, has not been received within a first duration.
11. The method of claim 8, wherein the first condition includes determining that a message, that indicates that the first plurality of data values has been successfully decoded, has not been received within a first duration.
12. The method of claim 5, further comprising:
storing the first plurality of data values in a buffer; and
transmitting a first message indicating that the first plurality of data values is available to be read from the buffer.
13. The method of claim 12, further comprising:
storing each respective hybrid plurality of data values in the buffer by overwriting any previously generated hybrid plurality of data values stored in the buffer; and
transmitting a subsequent message indicating that a new hybrid plurality of data values is available to be read from the buffer each time a hybrid plurality of data values is newly stored in the buffer.
14. The method of claim 5, wherein generating each respective hybrid plurality of data values includes an exclusive-or (XOR) between each of the latest read of the one or more subsequent pluralities of data values and one of a previously generated hybrid plurality of data values and the first plurality of data values.
15. A device, comprising :
a storage medium; and
a controller configured to:
receive from a requesting device a control command of a first type;
respond to receiving the control command of the first type by:
performing a first read operation, using a first reading signal value, to obtain a first plurality of data values from a portion of the storage medium;
after performing the first read operation, initiating performance of one or more additional read operations, each additional read operation using a respective reading signal value different from the first reading signal value to obtain a subsequent plurality of data values from the same portion of the storage medium as the first read operation; and terminating performance of the one or more additional read operations upon the earlier of completion of a predefined number of the additional read operations and receiving a subsequent control command.
16. The device of claim 15, wherein the subsequent control command is of a type that causes termination of the one or more additional read operations.
17. The device of claim 15, wherein the controller is further configured to:
store the first plurality of data values in a buffer;
transfer the first plurality of data values from the buffer to the requesting device; and initiate performance of a first additional read operation of the one or more additional read operations during a time period that overlaps with the transfer of the first plurality of data values from the buffer to the requesting device.
18. The device of claim 15, wherein the controller is further configured to:
store the first plurality of data values in a buffer;
set a status bit that is configured for reading by the requesting device; and
initiate performance of a first additional read operation of the one or more additional read operations at a time period proximate to a time that the status bit is set.
19. The device of claim 15, wherein so long as performance of the one or more additional read operations has not been terminated, the method includes generating, in response to a completion of each of the one or more additional read operations, a respective hybrid plurality of data values by combining the latest read plurality of data values with one of a previously generated hybrid plurality of data values and the first plurality of data values.
20. The device of claim 15, wherein the controller is configured to:
receive from a requesting device a control command of a second type, wherein the second type differs from the first type by indicating a request for a single read of a respective portion of the storage medium;
respond to receiving the control command of the second type by:
performing a single read operation to obtain data values from a portion of the storage medium;
storing the obtained data values in a buffer; and transferring the obtained data values from the buffer to the requesting device.
21. The device of any of claims 15-19, wherein the one or more additional read operations is limited to a predefined number of read operations.
22. The device of any of claims 15-19, wherein initiating performance of one or more additional read operations occurs in response to a first condition.
23. The device of claim 22, wherein the first condition includes receiving a message indicating that the first plurality of data values could not be decoded.
24. The device of claim 22, wherein the first condition includes determining that a message, that indicates that the first plurality of data values can be decoded successfully, has not been received within a first duration.
25. The device of claim 22, wherein the first condition includes determining that a message, that indicates that the first plurality of data values has been successfully decoded, has not been received within a first duration.
26. The device of claim 19, wherein the controller is further configured to:
store the first plurality of data values in a buffer; and
transmit a first message indicating that the first plurality of data values is available to be read from the buffer.
27. The device of claim 26, wherein the controller is further configured to:
store each respective hybrid plurality of data values in the buffer by overwriting any previously generated hybrid plurality of data values stored in the buffer; and
transmit a subsequent message indicating that a new hybrid plurality of data values is available to be read from the buffer each time a hybrid plurality of data values is newly stored in the buffer.
28. The device of claim 19, wherein generating each respective hybrid plurality of data values includes an exclusive-or (XOR) between each of the latest read of the one or more subsequent pluralities of data values and one of a previously generated hybrid plurality of data values and the first plurality of data values.
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