AM29LV256MH103REF datasheet(37/69 Pages) AMD

37 / 69 page

December 16, 2005

Am29LV256M

D A TA SH EE T

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

Address/Data

pair

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.

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 = 1, or cause the DQ7

and DQ6 status bits to indicate the operation was suc-

cessful. 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 16 for timing diagrams.

AM29LV256MH103REF Datasheet(PDF) 37 Page - Advanced Micro Devices

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