S29GL128P SPANSION, S29GL128P Datasheet - Page 20

• Manufacturer Part Number: S29GL128P
• Description: Page Mode Flash Memory
• Manufacturer: SPANSION

18
Software Functions and Sample Code
Note
1. Any offset within the device works.
2. base = base address.
The following is a C source code example of using the autoselect function to read the manufacturer ID. 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.
/* Here is an example of Autoselect mode (getting manufacturer ID) */
/* Define UINT16 example: typedef unsigned short UINT16; */
UINT16 manuf_id;
/* Auto Select Entry */
*( (UINT16 *)base_addr + 0x555 ) = 0x00AA; /* write unlock cycle 1 */
*( (UINT16 *)base_addr + 0x2AA ) = 0x0055; /* write unlock cycle 2 */
*( (UINT16 *)base_addr + 0x555 ) = 0x0090; /* write autoselect command */
/* multiple reads can be performed after entry */
manuf_id = *( (UINT16 *)base_addr + 0x000 ); /* read manuf. id */
/*
*( (UINT16 *)base_addr + 0x000 ) = 0x00F0; /* exit autoselect (write reset command) */
Autoselect Command
Autoselect exit */
Unlock Cycle 1
Unlock Cycle 2
Unlock Cycle 1
Cycle
Cycle
D a t a
S29GL-P MirrorBit
Operation
Operation
S h e e t
Table 7.4 Autoselect Entry in System
Write
Write
Write
Write
(LLD Function = lld_AutoselectEntryCmd)
(LLD Function = lld_AutoselectExitCmd)
Table 7.5 Autoselect Exit
( A d v a n c e
TM
Byte Address
Byte Address
base + XXXh
BasexAAAh
BasexAAAh
Flash Family
Basex555h
Word Address
Word Address
base + XXXh
I n f o r m a t i o n )
Basex2AAh
Basex555h
Basex555h
S29GL-P_00_A3 November 21, 2006
0x00AAh
0x00F0h
0x0055h
0x0090h
Data
Data