Document Number: 001-98285 Rev. *R
S29GL01GS/S29GL512S
S29GL256S/S29GL128S
Note:
These tables have been condensed to show sector related information for an entire device on a single page Sectors and their
address ranges that are not explicitly listed (such as SA001-SA510) have sectors starting and ending addresses that form the same
pattern as all other sectors of that size. For example, all 128 kB sectors have the pattern XXX0000h–XXXFFFFh.
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 within, and overlays the Flash Array data of, the sector selected by the address used in the ID-CFI
enter command. While the ID-CFI ASO is entered the content of all other sectors is undefined.
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. See
for ASO Entry timing requirements.
For the complete address map see
Table 2.4
S29GL128S Sector and Memory Address Map
Sector Size (kbyte)
Sector Count
Sector Range
Address Range
(16-Bit)
Notes
128
128
SA00
0000000h–000FFFFh
Sector Starting Address
:
:
–
SA127
07F0000h–07FFFFFh
Sector Ending Address
Table 2.5
ID-CFI Address Map Overview
Word Address
Description
Read / Write
(SA) + 0000h to 000Fh
Device ID
(traditional Autoselect values)
Read Only
(SA) + 0010h to 0079h
CFI data structure
Read Only
(SA) + 0080h to FFFFh
Undefined
Read Only
