S29WS064N0LBAI011 datasheet(32/99 Pages) SPANSION

32 / 99 page

S29WS-N_00_G0 January 25, 2005

Adva nce

Information

Note: Base = Base Address.

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

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

www.fujitsu.com) for general information on Spansion Flash memory software development

guidelines.

/* Example: Program Command

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

/* write unlock cycle 1

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

/* write unlock cycle 2

*( (UINT16 *)base_addr + 0x555 ) = 0x00A0;

/* write program setup command

*( (UINT16 *)pa )

= data;

/* write data to be programmed

/* Poll for program completion */

7.5.2 Write Buffer Programming

Write Buffer Programming allows the system to write a maximum of 32 words in one program-

ming operation. This results in a faster effective word programming time than the standard

“word” programming algorithms. The Write Buffer Programming command sequence is initiated

by first writing two unlock cycles. This is followed by a third write cycle containing the Write Buffer

Load command written at the Sector Address in which programming occurs. At this point, the sys-

tem writes the number of “word locations minus 1” that are loaded into the page buffer at the

Sector Address in which programming occurs. This tells the device how many write buffer ad-

dresses are loaded with data and therefore when to expect the “Program Buffer to Flash” confirm

command. The number of locations to program cannot exceed the size of the write buffer or the

operation aborts. (Number loaded = the number of locations to program minus 1. For example,

if the system programs 6 address locations, then 05h should be written to the device.)

The system then writes the starting address/data combination. This starting address is the first

address/data pair to be programmed, and selects the “write-buffer-page” address. All subsequent

address/data pairs must fall within the elected-write-buffer-page.

The “write-buffer-page” is selected by using the addresses AMAX - A5.

The “write-buffer-page” addresses must be the same for all address/data pairs loaded into the

write buffer. (This means Write Buffer Programming cannot be performed across multiple “write-

buffer-pages.” This also means that Write Buffer Programming cannot be performed across mul-

tiple sectors. If the system attempts to load programming data outside of the selected “write-

buffer-page”, the operation ABORTs.)

After writing the Starting Address/Data pair, the system then writes the remaining address/data

pairs into the write buffer.

Note that if a Write Buffer address location is loaded multiple times, the “address/data pair”

counter is decremented for every data load operation. Also, the last data loaded at a location be-

fore the “Program Buffer to Flash” confirm command is programmed into the device. It is the

software's responsibility to comprehend ramifications of loading a write-buffer location more than

Software Functions and Sample Code

Table 7.12. Single Word Program

(LLD Function = lld_ProgramCmd)

Cycle

Operation

Byte Address

Word Address

Data

Unlock Cycle 1

Write

Base + AAAh

Base + 555h

00AAh

Unlock Cycle 2

Write

Base + 554h

Base + 2AAh

0055h

Program Setup

Write

Base + AAAh

Base + 555h

00A0h

Program

Write

Word Address

Data Word

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