AM29LV640MT100REF datasheet(33/66 Pages) AMD

33 / 66 page

February 1, 2007 26190C8

Am29LV640MT/B

D A TA

SH EET

Figure 4.

Write Buffer Programming Operation

Write “Write to Buffer”

command and

Sector Address

Write number of addresses

to program minus 1(WC)

and Sector Address

Write program buffer to

flash sector address

Write first address/data

Write to a different

sector address

FAIL or ABORT

PASS

Read DQ7 - DQ0 at

Last Loaded Address

Read DQ7 - DQ0 with

address = Last Loaded

Address

Write next address/data pair

WC = WC - 1

WC = 0 ?

Part of “Write to Buffer”

Command Sequence

Yes

Abort Write to

Buffer Operation?

DQ7 = Data?

DQ5 = 1?

DQ1 = 1?

Write to buffer ABORTED.

Must write “Write-to-buffer

Abort Reset” command

sequence to return

to read mode.

Notes:

When Sector Address is specified, any address in

the selected sector is acceptable. However, when

loading Write-Buffer address locations with data, all

addresses must fall within the selected Write-Buffer

Page.

DQ7 can change simultaneously with DQ5.

Therefore, verify DQ7 .

If this flowchart location was reached because

DQ5= “1”, then the device FAILED. If this flowchart

location was reached because DQ1= “1”, then the

Write to Buffer operation was ABORTED. In either

case, the proper reset command must write before

the device can begin another operation. If DQ1=1,

write the Write-Buffer-Programming-Abort-Reset

command. if DQ5=1, write the Reset command.

See Table 13 for command sequences required for

write buffer programming.

(Note 3)

(Note 1)

(Note 2)

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