AM29LV640MU Datasheet, PDF (28/58 Pages) Advanced Micro Devices – 64 Megabit (4 M x 16-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with

ADVANCE INFORMATION
Write “Write to Buffer”
command and
Sector Address
Write number of addresses
to program minus 1(WC)
and Sector Address
Part of “Write to Buffer”
Command Sequence
Write first address/data
Yes
WC = 0 ?
No
Abort Write to
Yes
Buffer Operation?
No
(Note 1) Write next address/data pair
WC = WC - 1
Write program buffer to
flash sector address
Read DQ7 - DQ0 at
Last Loaded Address
No
DQ1 = 1?
Yes
Yes
DQ7 = Data?
No
No
DQ5 = 1?
Yes
Read DQ7 - DQ0 with
address = Last Loaded
Address
Write to a different
sector address
Write to buffer ABORTED.
Must write “Write-to-buffer
Abort Reset” command
sequence to return
to read mode.
Notes:
1. 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.
2. DQ7 may change simultaneously with DQ5.
Therefore, DQ7 should be verified.
3. 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 be written 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.
4. See Table 10 for command sequences required for
write buffer programming.
(Note 2)
(Note 3)
Yes
DQ7 = Data?
No
FAIL or ABORT
PASS
Figure 4. Write Buffer Programming Operation
June 12, 2003
Am29LV640MU
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