AM29LV6402ML100R datasheet(28/57 Pages) SPANSION

28 / 57 page

Am29LV6402M

January 23, 2006

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 and DQ15, DQ6 and DQ14, DQ5

and DQ13, and DQ1 and DQ9 should be monitored to

determine the device status during Write Buffer Pro-

gramming.

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 and DQ9 = 1,

DQ7 and DQ15 = DATA# (for the last address location

loaded), DQ6 and DQ14 = toggle, and DQ5 and DQ13

=0. A Write-to-Buffer-Abort Reset command sequence

must be written to reset the device for the next opera-

tion. Note that the full 3-cycle Write-to-Buffer-Abort

Reset command sequence is required when using

Write-Buffer-Programming features in Unlock Bypass

mode.

Programming is allowed in any sequence and across

sector boundaries. A bit cannot be programmed

from “0” back to a “1.” Attempting to do so may

cause the device to set DQ5 and/or DQ13= 1, or

cause the DQ7 and/or DQ15 and DQ6 and/or DQ14

status bits to indicate the operation was successful.

However, a succeeding read will show that the data is

still “0.” Only erase operations can convert a “0” to a

“1.”

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. WP# has an internal pullup; when un-

connected, WP# is at V

IH.

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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