S29GL01GS datasheet(8/108 Pages) CYPRESS

8 / 108 page

Document Number: 001-98285 Rev. *R

Page 8 of 108

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 Figure 11.16 on page 87 for ASO Entry timing requirements.

For the complete address map see Table7.2 onpage58.

Table 2.4 S29GL128S Sector and Memory Address Map

Sector Size (kbyte)

Sector Count

Sector Range

Address Range

(16-Bit)

Notes

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

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