AM29LV320ML112REF datasheet(28/59 Pages) AMD

28 / 59 page

Am29LV320MH/L

26517B4 January 31, 2007

D A TA

SH EE T

means that Write Buffer Programming cannot be per-

formed across multiple sectors. If the system attempts

to load programming data outside of the selected

write-buffer page, the operation will abort.

Note that if a Write Buffer address location is loaded

multiple times, the address/data pair counter will be

decremented for every data load operation. The host

syste m m u st there fo r e account fo r loa d in g a

write-buffer location more than once. The counter dec-

rements for each data load operation, not for each

unique write-buffer-address location. Note also that if

an address location is loaded more than once into the

buffer, the final data loaded for that address will be

programmed.

Once the specified number of write buffer locations

have been loaded, the system must then write the Pro-

gram Buffer to Flash command at the sector address.

Any other address and data combination aborts the

Write Buffer Programming operation. The device then

begins programming. Data polling should be used

while monitoring the last address location loaded into

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 may 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 may result. In addition, no external pullup is nec-

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

CC.

Figure 5 illustrates the algorithm for the program oper-

ation. Refer to the Erase and Program Operations

table in the AC Characteristics section for parameters,

and Figure 17 for timing diagrams.

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