參數(shù)資料
型號(hào)： AM29LV256MH128EI
廠商： ADVANCED MICRO DEVICES INC
元件分類(lèi)： PROM
英文描述： 16M X 16 FLASH 3V PROM, 120 ns, PDSO56
封裝： TSOP-56
文件頁(yè)數(shù)： 27/63頁(yè)
文件大小： 1515K
代理商： AM29LV256MH128EI
September 9, 2002
Am29LV256M
33
A D VA NCE
I N FO RM ATIO N
s Load a value that is greater than the page buffer
size during the Number of Locations to Program
step.
s Write to an address in a sector different than the
one specified during the Write-Buffer-Load com-
mand.
s 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.
s 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
V
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 4 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.
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