AM29LV6402ML100R datasheet(29/57 Pages) SPANSION

29 / 57 page

January 23, 2006

Am29LV6402M

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 and DQ15 may change simultaneously with

DQ5 and DQ13. Therefore, DQ7 and DQ15

should be verified.

If this flowchart location was reached because

DQ5 and DQ13 = “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 be written before the device can

begin another operation. If DQ1 and DQ9 =1,

write the Write-Buffer-Programming-Abort-Reset

command. if DQ5 and DQ13 =1, write the Reset

command.

See Tables 10 and 11 for command sequences

required for write buffer programming.

(Note 3)

(Note 1)

(Note 2)

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