S75WS256NDFBAWMB datasheet(33/216 Pages) SPANSION

33 / 216 page

February 17, 2005 S75WS-N-00_A0

S75WS256Nxx Based MCPs

Advance

Information

Notes:

1. Any offset within the device works.

2. BA = Bank Address. The bank address is required.

3. base = base address.

The following is a C source code example of using the autoselect function to read the manu-

facturer ID. Refer to the Spansion Low Level Driver User Guide (available on www.amd.com

and www.fujitsu.com) for general information on Spansion Flash memory software develop-

ment 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 *)bank_addr + 0x555 ) = 0x00AA; /* write unlock cycle 1 */

*( (UINT16 *)bank_addr + 0x2AA ) = 0x0055; /* write unlock cycle 2 */

*( (UINT16 *)bank_addr + 0x555 ) = 0x0090; /* write autoselect command */

/* multiple reads can be performed after entry */

manuf_id = *( (UINT16 *)bank_addr + 0x000 ); /* read manuf. id */

Autoselect exit */

*( (UINT16 *)base_addr + 0x000 ) = 0x00F0; /* exit autoselect (write reset command) */

Software Functions and Sample Code

Table 8.10 Autoselect Entry

(LLD Function = lld_AutoselectEntryCmd)

Cycle

Operation

Byte Address

Word Address

Data

Unlock Cycle 1

Write

BAxAAAh

BAx555h

0x00AAh

Unlock Cycle 2

Write

BAx555h

BAx2AAh

0x0055h

Autoselect Command

Write

BAxAAAh

BAx555h

0x0090h

Table 8.11 Autoselect Exit

(LLD Function = lld_AutoselectExitCmd)

Cycle

Operation

Byte Address

Word Address

Data

Unlock Cycle 1

Write

base + XXXh

0x00F0h

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