s29gl01gp Meet Spansion Inc., s29gl01gp Datasheet - Page 73

• Manufacturer Part Number: s29gl01gp
• Description: 3.0 Volt-only Page Mode Flash Memory Featuring 90 Nm Mirrorbit Process Technology
• Manufacturer: Meet Spansion Inc.

12.2
June 11, 2008 S29GL-P_00_A11
Common Flash Memory Interface
The Common Flash Interface (CFI) specification outlines device and host system software interrogation
handshake, which allows specific vendor-specified software algorithms to be used for entire families of
devices. Software support can then be device-independent, JEDEC ID-independent, and forward- and back-
ward-compatible for the specified flash device families. Flash vendors can standardize their existing
interfaces for long-term compatibility.
This device enters the CFI Query mode when the system writes the CFI Query command, 98h, to address
55h any time the device is ready to read array data. The system can read CFI information at the addresses
given in Tables 12.6–12.8). All reads outside of the CFI address range, returns non-valid data. Reads from
other sectors are allowed, writes are not. To terminate reading CFI data, the system must write the reset
command.
The system can also write the CFI query command when the device is in the autoselect mode. The device
enters the CFI query mode, and the system can read CFI data at the addresses given in Tables 12.6–12.8.
The system must write the reset command to return the device to reading array data.
The following is a C source code example of using the CFI Entry and Exit functions. Refer to the Spansion
Low Level Driver User’s Guide (available on www.spansion.com) for general information on Spansion Flash
memory software development guidelines.
For further information, please refer to the CFI Specification (see JEDEC publications JEP137-A and
JESD68.01and CFI Publication 100). Please contact your sales office for copies of these documents.
Addresses
/* Example: CFI Entry command */
/* Example: CFI Exit command
*( (UINT16 *)base_addr + 0x55 ) = 0x0098;
*( (UINT16 *)base_addr + 0x000 ) = 0x00F0;
(x16)
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
Addresses
(x8)
2Ah
2Ch
2Eh
20h
22h
24h
26h
28h
30h
32h
34h
D a t a
S29GL-P MirrorBit
Table 12.5 CFI Query Identification String
*/
S h e e t
0051h
0052h
0059h
0002h
0000h
0040h
0000h
0000h
0000h
0000h
0000h
Data
®
Query Unique ASCII string “QRY”
Primary OEM Command Set
Address for Primary Extended Table
Alternate OEM Command Set (00h = none exists)
Address for Alternate OEM Extended Table (00h = none exists)
Flash Family
/* write CFI entry command
/* write cfi exit command
Description
*/
*/
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