S75WS256NDFBAWMB datasheet(38/216 Pages) SPANSION

38 / 216 page

S75WS256Nxx Based MCPs

S75WS-N-00_A0 February 17, 2005

Ad van c e

Inf o rmation

Notes:

1. Base = Base Address.

2. Last = Last cycle of write buffer program operation; depending on number of words written, the total

number of cycles may be from 6 to 37.

3. For maximum efficiency, it is recommended that the write buffer be loaded with

the highest number of words (N words) possible.

The following is a C source code example of using the write buffer program function. Refer to

the Spansion Low Level Driver User Guide (available on www.amd.com and

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

ment guidelines.

/* Example: Write Buffer Programming Command

/* NOTES: Write buffer programming limited to 16 words. */

All addresses to be written to the flash in

one operation must be within the same flash

page. A flash page begins at addresses

evenly divisible by 0x20.

UINT16 *src = source_of_data;

/* address of source data

UINT16 *dst = destination_of_data;

/* flash destination address

UINT16 wc

= words_to_program -1;

/* word count (minus 1)

*( (UINT16 *)base_addr + 0x555 ) = 0x00AA;

/* write unlock cycle 1

*( (UINT16 *)base_addr + 0x2AA ) = 0x0055;

/* write unlock cycle 2

*( (UINT16 *)sector_address )

= 0x0025;

/* write write buffer load command */

*( (UINT16 *)sector_address )

= wc;

/* write word count (minus 1)

loop:

*dst = *src; /* ALL dst MUST BE SAME PAGE */ /* write source data to destination */

dst++;

/* increment destination pointer

src++;

/* increment source pointer

if (wc == 0) goto confirm

/* done when word count equals zero */

wc--;

/* decrement word count

goto loop;

/* do it again

confirm:

*( (UINT16 *)sector_address )

= 0x0029;

/* write confirm command

/* poll for completion */

/* Example: Write Buffer Abort Reset */

*( (UINT16 *)addr + 0x555 ) = 0x00AA;

/* write unlock cycle 1

*( (UINT16 *)addr + 0x2AA ) = 0x0055;

/* write unlock cycle 2

*( (UINT16 *)addr + 0x555 ) = 0x00F0;

/* write buffer abort reset

Software Functions and Sample Code

Table 8.13 Write Buffer Program

(LLD Functions Used = lld_WriteToBufferCmd, lld_ProgramBufferToFlashCmd)

Cycle

Description

Operation

Byte Address

Word Address

Data

Unlock

Write

Base + AAAh

Base + 555h

00AAh

Unlock

Write

Base + 554h

Base + 2AAh

0055h

Write Buffer Load Command

Write

Program Address

0025h

Write Word Count

Write

Program Address

Word Count (N–1)h

Number of words (N) loaded into the write buffer can be from 1 to 32 words.

5 to 36

Load Buffer Word N

Write

Program Address, Word N

Word N

Last

Write Buffer to Flash

Write

Sector Address

0029h

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