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Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. Both use the same cell design, consisting of floating gate MOSFETs.
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- Hardware Architecture
- Prediction Graph
- Prefetch Procedure
Four essential components are included in the hardware design: host interface, SRAM (cache), NAND flash memory, and control logic. In order to fill up the performance gap between NAND and NOR, SRAM serves as a cache layer for data access over NAND. The host interface is responsible to the communication with the host system via address and data buse...
The access pattern of an application execution over NOR (or NAND) consists of a sequence of LBA's. As an application runs for multiple times, the “virtually” complete picture of the possible access pattern of an application execution might appear. Since most application executions are input-dependent or data-driven, there can be more than one subse...
The objective of the prefetch procedure is to prefetch data from NAND based on a given prediction graph such that most data accesses occur over SRAM. The basic idea is to prefetch data by following the LBA order in the graph. In order to efficiently look up a selected page in the cache, a cyclic queue is adopted in the cache management. Data prefet...
Flash memory devices use two different technologies—NOR and NAND—to map data. NOR flash provides high-speed random access, reading and writing data in specific memory locations; it can retrieve as little as a single byte. NAND flash reads and writes
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The Common Flash Memory Interface ( CFI) is an open standard jointly developed by AMD, Intel, Sharp and Fujitsu. It is implementable by all flash memory vendors, and has been approved by the non-volatile-memory subcommittee of JEDEC.
There is no clear boundary dividing the two, but the term "EEPROM" is generally used to describe non-volatile memory with small erase blocks (as small as one byte) and a long lifetime (typically 1,000,000 cycles). Many past microcontrollers included both (flash memory for the firmware and a small EEPROM for parameters), though the trend with ...
