AM29LV640MT100REF datasheet(32/66 Pages) AMD

32 / 66 page

Am29LV640MT/B

26190C8 February 1, 2007

D A TA

SH EE T

the write buffer. DQ7, DQ6, DQ5, and DQ1 should be

monitored to determine the device status during Write

Buffer Programming.

The write-buffer programming operation can be sus-

pended using the standard program suspend/resume

commands. Upon successful completion of the Write

Buffer Programming operation, the device is ready to

execute the next command.

The Write Buffer Programming Sequence can be

aborted in the following ways:

■ Load a value that is greater than the page buffer

size during the Number of Locations to Program

step.

■ Write to an address in a sector different than the

one specified during the Write-Buffer-Load com-

mand.

■ Write an Address/Data pair to a different

write-buffer-page than the one selected by the

Starting Address during the write buffer data load-

ing stage of the operation.

■ Write data other than the Confirm Command after

the specified number of data load cycles.

The abort condition is indicated by DQ1 = 1, DQ7 =

DATA# (for the last address location loaded), DQ6 =

toggle, and DQ5=0. A Write-to-Buffer-Abort Reset

command sequence must be written to reset the de-

vice for the next operation. Note that the full 3-cycle

Write-to-Buffer-Abort Reset command sequence is re-

quired when using Write-Buffer-Programming features

in Unlock Bypass mode.

Accelerated Program

The device offers accelerated program operations

through the WP#/ACC pin. When the system asserts

HH on the WP#/ACC pin, the device automatically en-

ters the Unlock Bypass mode. The system can then

write the two-cycle Unlock Bypass program command

sequence. The device uses the higher voltage on the

WP#/ACC pin to accelerate the operation. Note that

the WP#/ACC pin must not be at V

HH for operations

other than accelerated programming, or device dam-

age can result. In addition, no external pullup is neces-

sary since the WP#/ACC pin has internal pullup to

CC.

Figure 5 illustrates the algorithm for the program oper-

ation. See the table, Erase and Program Operations

on page 48 in AC Characteristics for parameters, and

Figure 17 for timing diagrams.

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