參數(shù)資料
型號(hào)： AM29F160DT90FI
廠(chǎng)商： ADVANCED MICRO DEVICES INC
元件分類(lèi)： PROM
英文描述： 16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 5.0 Volt-only, Boot Sector Flash Memory
中文描述： 1M X 16 FLASH 5V PROM, 90 ns, PDSO48
封裝： REVERSE, MO-142DD, TSOP-48
文件頁(yè)數(shù)： 14/46頁(yè)
文件大?。?/td> 914K
代理商： AM29F160DT90FI
Am29F160D
13
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the 16 Kbyte boot sector without
using V
ID
.
If the system asserts V
IL
on the WP# pin, the device
disables program and erase functions for the 16 Kbyte
boot sector (SA34 for top boot device and SA0 for bot-
tom boot device) independently of whether those sec-
tors were protected or unprotected using the method
described in “Sector Protection/Unprotection”.
If the system asserts V
IH
on the WP# pin, the device
reverts to whether the 16 Kbyte boot sector was previ-
ously set to be protected or unprotected using the
method described in “Sector Protection/Unprotection”.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to V
ID
. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Note, however, that the boot sector
will still be protected if WP# is asserted low. Once V
ID
is removed from the RESET# pin, all the previously pro-
tected sectors are protected again. Figure shows the
algorithm, and Figure 19 shows the timing diagrams,
for this feature.
Figure 1.
Temporary Sector Unprotect Operation
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sectors unprotected. Boot sector remains
protected if WP# is low.
2. All previously protected sectors are protected once
again.
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