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S29GL01GT10DHIyyx Datasheet(PDF) 8 Page - Cypress Semiconductor

Part # S29GL01GT10DHIyyx
Description  1 Gbit (128 Mbyte), 512 Mbit (64 Mbyte)
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

S29GL01GT10DHIyyx Datasheet(HTML) 8 Page - Cypress Semiconductor

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Document Number: 002-00247 Rev. *G
Page 8 of 105
S29GL01GT, S29GL512T
2.2
Device ID and CFI (ID-CFI) ASO
There are two traditional methods for systems to identify the type of flash memory installed in the system. One has traditionally been
called Autoselect and is now referred to as Device Identification (ID). The other method is called Common Flash Interface (CFI).
For ID, a command is used to enable an address space overlay where up to 16 word locations can be read to get JEDEC
manufacturer identification (ID), device ID, and some configuration and protection status information from the flash memory. The
system can use the manufacturer and device IDs to select the appropriate driver software to use with the flash device.
CFI also uses a command to enable an address space overlay where an extendable table of standard information about how the
flash memory is organized and operates can be read. With this method the driver software does not have to be written with the
specifics of each possible memory device in mind. Instead the driver software is written in a more general way to handle many
different devices but adjusts the driver behavior based on the information in the CFI table.
Traditionally these two address spaces have used separate commands and were separate overlays. However, the mapping of these
two address spaces are non-overlapping and so can be combined in to a single address space and appear together in a single
overlay. Either of the traditional commands used to access (enter) the Autoselect (ID) or CFI overlay will cause the now combined
ID-CFI address map to appear.
The ID-CFI address map appears overlays the entire Flash Array.
The ID-CFI address map starts at location 0 of the selected sector. Locations above the maximum defined address of the ID-CFI
ASO to the maximum address of the selected sector have undefined data. The ID-CFI enter commands use the same address and
data values used on previous generation memories to access the JEDEC Manufacturer ID (Autoselect) and Common Flash
Interface (CFI) information, respectively.
For the complete address map see Table 7.3 on page 55.
2.2.1
Device ID
The Joint Electron Device Engineering Council (JEDEC) standard JEP106T defines the manufacturer ID for a compliant memory.
Common industry usage defined a method and format for reading the manufacturer ID and a device specific ID from a memory
device. The manufacturer and device ID information is primarily intended for programming equipment to automatically match a
device with the corresponding programming algorithm. Cypress has added additional fields within this 32-byte address space.
The original industry format was structured to work with any memory data bus width e. g. x8, x16, x32. The ID code values are
traditionally byte wide but are located at bus width address boundaries such that incrementing the device address inputs will read
successive byte, word, or double word locations with the ID codes always located in the least significant byte location of the data
bus. Because the device data bus is word wide each code byte is located in the lower half of each word location. The original
industry format made the high order byte always 0. Cypress has modified the format to use both bytes in some words of the address
space. For the detail description of the Device ID address map see Table 7.3 on page 55.
2.2.2
Common Flash Memory Interface
The JEDEC Common Flash Interface (CFI) specification (JESD68.01) defines a standardized data structure that may be read from a
flash memory device, which allows vendor-specified software algorithms to be used for entire families of devices. The data structure
contains information for system configuration such as various electrical and timing parameters, and special functions supported by
the device. Software support can then be device-independent, Device ID-independent, and forward-and-backward-compatible for
entire Flash device families.
The system can read CFI information at the addresses within the selected sector as shown in Device ID and Common Flash
Interface (ID-CFI) ASO Map on page 55.
Table 2.3 ID-CFI Address Map Overview
Word Address
Byte Address
Description
Read / Write
(SA) + 0000h to 000Fh
(SA) + 0000h to 001Fh
Device ID (traditional Autoselect values)
Read Only
(SA) + 0010h to 0079h
(SA) + 0020h to 00F2h
CFI data structure
Read Only
(SA) + 0080h to FFFFh
(SA) + 00F3h to 1FFFFh
Undefined
Read Only


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