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In block 1404, the read scan circuit may configure a second read level window for a second candidate read level based on a correlation. The correlation is between at least one of the two adjacent memory states and one or more other adjacent memory states associated with the second read level window. |
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In block 1406, the read scan circuit may scan the second read level window for a second candidate read level that activates the fewest number of memory cells in relation to other candidate read levels within the second read level window. Once the first candidate read level and second candidate read level are determined by the read scan circuit, in block 1408, the read scan circuit may configure a read operation to use the first candidate read level and the second candidate read level. |
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As depicted in FIG. 15, the data processing system 1502 may include one or more processor(s) 1512 and a storage subsystem 1514. "Processor" refers to any circuitry, component, chip, die, package, or module configured to receive, interpret, decode, and execute machine instructions. "Instructions" refers to symbols representing commands for execution by a device using a processor, microprocessor, controller, interpreter, or other programmable logic. Broadly, `instructions` can mean source code, object code, and executable code. "Instructions" herein is also meant to include commands embodied in programmable read-only memories (EPROM) or hard coded into hardware (e.g., "micro-code") and like implementations wherein the instructions are configured into a machine read-only memory or other hardware component at manufacturing time of a device. Examples of a processor may include, but are not limited to, a central processing unit, a general-purpose processor, an application-specific processor, a graphics processing unit (GPU), a field programmable gate array (FPGA), Application Specific Integrated Circuit (ASIC), System on a Chip (SoC), virtual processor, processor core, and the like. |
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The processor(s) 1512 communicate with a number of peripheral devices via a bus subsystem 1516. These peripheral devices may include input device(s) 1508, output device(s) 1510, communication network interface 1506, and the storage subsystem 1514. The storage subsystem 1514, in one embodiment, comprises one or more storage devices and/or one or more memory devices. |
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"Storage device" or "memory device" refers to any hardware, system, sub-system, circuit, component, module, non-volatile memory media, hard disk drive, storage array, device, or apparatus configured, programmed, designed, or engineered to store data for a period of time and retain the data in the storage device while the storage device is not using power from a power supply. Examples of storage devices include, but are not limited to, a hard disk drive, FLASH memory, MRAM memory, a Solid-State storage device, Just a Bunch Of Disks (JBOD), Just a Bunch Of Flash (JBOF), an external hard disk, an internal hard disk, and the like. |
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While the non-volatile memory media is referred to herein as "memory media," in various embodiments, the non-volatile memory media may more generally be referred to as non-volatile memory. Because non-volatile memory media is capable of storing data when a power supply is removed, the non-volatile memory media may also be referred to as a recording media, non-volatile recording media, storage media, storage, non-volatile memory, volatile memory medium, non-volatile storage medium, non-volatile storage, or the like. |
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In one embodiment, the storage subsystem 1514 includes a volatile memory 1518 and a non-volatile memory 1520. The volatile memory 1518 and/or the non-volatile memory 1520 may store computer-executable instructions that alone or together form logic 1522 that when applied to, and executed by, the processor(s) 1512 implement embodiments of the processes disclosed herein. |
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"Volatile memory" refers to a shorthand name for volatile memory media. In certain embodiments, volatile memory refers to the volatile memory media and the logic, controllers, processor(s), state machine(s), and or other periphery circuits that manage the volatile memory media and provide access to the volatile memory media. |
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"Volatile memory media" refers to any hardware, device, component, element, or circuit configured to maintain an alterable physical characteristic used to represent a binary value of zero or one for which the alterable physical characteristic reverts to a default state that no longer represents the binary value when a primary power source is removed or unless a primary power source is used to refresh the represented binary value. Examples of volatile memory media include but are not limited to dynamic random-access memory (DRAM), static random-access memory (SRAM), double data rate random-access memory (DDR RAM) or other random-access solid-state memory. |
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While the volatile memory media is referred to herein as "memory media," in various embodiments, the volatile memory media may more generally be referred to as volatile memory. |
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"Non-volatile memory" refers to shorthand name for non-volatile memory media. In certain embodiments, non-volatile memory media refers to the non-volatile memory media and the logic, controllers, processor(s), state machine(s), and/or other periphery circuits that manage the non-volatile memory media and provide access to the non-volatile memory media. |
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The input device(s) 1508 include devices and mechanisms for inputting information to the data processing system 1502. These may include a keyboard, a keypad, a touch screen incorporated into a graphical user interface, audio input devices such as voice recognition systems, microphones, and other types of input devices. In various embodiments, the input device(s) 1508 may be embodied as a computer mouse, a trackball, a track pad, a joystick, wireless remote, drawing tablet, voice command system, eye tracking system, and the like. The input device(s) 1508 typically allow a user to select objects, icons, control areas, text and the like that appear on a graphical user interface via a command such as a click of a button or the like. |
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The output device(s) 1510 include devices and mechanisms for outputting information from the data processing system 1502. These may include a graphical user interface, speakers, printers, infrared LEDs, and so on, as well understood in the art. In certain embodiments, a graphical user interface is coupled to the bus subsystem 1516 directly by way of a wired connection. In other embodiments, the graphical user interface couples to the data processing system 1502 by way of the communication network interface 1506. For example, the graphical user interface may comprise a command line interface on a separate computing device 1500 such as desktop, server, or mobile device. |
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The communication network interface 1506 provides an interface to communication networks (e.g., communication network 1504) and devices external to the data processing system 1502. The communication network interface 1506 may serve as an interface for receiving data from and transmitting data to other systems. Embodiments of the communication network interface 1506 may include an Ethernet interface, a modem (telephone, satellite, cable, ISDN), (asynchronous) digital subscriber line (DSL), FireWire, USB, a wireless communication interface such as Bluetooth or WiFi, a near field communication wireless interface, a cellular interface, and the like. |
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The communication network interface 1506 may be coupled to the communication network 1504 via an antenna, a cable, or the like. In some embodiments, the communication network interface 1506 may be physically integrated on a circuit board of the data processing system 1502, or in some cases may be implemented in software or firmware, such as "soft modems", or the like. |
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"Software" refers to logic implemented as processor-executable instructions in a machine memory (e.g., read/write volatile memory media or non-volatile memory media). |
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"Hardware" refers to functional elements embodied as analog and/or digital circuitry. |
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"Firmware" refers to logic embodied as processor-executable instructions stored on volatile memory media and/or non-volatile memory media. |
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The storage client 110 manages files and data and utilizes the functions and features of the storage controller 102 and associated memory dies 104. Representative examples of storage clients include, but are not limited to, a server, a file system, an operating system, a database management system ("DBMS"), a volume manager, and the like. The storage client 110 is in communication with the storage controller 102 within the storage device 200. In some embodiments, the storage client 110 may include remote storage clients operating on hosts 106 or otherwise accessible via the network 116. Storage clients may include, but are not limited to operating systems, file systems, database applications, server applications, kernel-level processes, user-level processes, applications, and the like. |
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In one embodiment, the storage system 100 includes one or more clients connected to one or more hosts 106 through one or more computer networks 116. A host 106 may be a server, a storage controller of a SAN, a workstation, a personal computer, a laptop computer, a handheld computer, a supercomputer, a computer cluster, a network switch, router, or appliance, a database or storage appliance, a data acquisition or data capture system, a diagnostic system, a test system, a robot, a portable electronic device, a wireless device, or the like. The network 116 may include the Internet, a wide area network ("WAN"), a metropolitan area network ("MAN"), a local area network ("LAN"), a token ring, a wireless network, a fiber channel network, a SAN, network attached storage ("NAS"), ESCON, or the like, or any combination of networks. The network 116 may also include a network from the IEEE 802 family of network technologies, such Ethernet, token ring, WiFi, WiMax, and the like. |
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