參數(shù)資料
型號(hào)： AM41LV3204M
英文描述： Stacked Multi-chip Package (MCP) 32 Mbit (4 M x 8 bit/2 M x 16-bit) Flash Memory and 4 Mbit (512K x 8-Bit/256 K x 16-Bit) Static RAM (Preliminary)
中文描述： 堆疊式多芯片封裝（MCP）32兆位（4個(gè)M × 8位/ 2米x 16位）閃存和4兆位（為512k × 8-Bit/256畝x 16位），靜態(tài)存儲(chǔ)器（初步）
文件頁(yè)數(shù)： 20/67頁(yè)
文件大小： 1030K
代理商： AM41LV3204M
June 10, 2003
Am41LV3204M
19
P R E L I M I N A R Y
the standby mode, the maximum input load current is
increased. See the table in “DC Characteristics”.
If the system asserts V
IH
on the WP#/ACC pin, the de-
vice reverts to whether the top or bottom two sectors
were previously set to be protected or unprotected
using the method described in “Sector Group Protec-
tion and Unprotection”.
Note: No external pullup is
necessary since the WP#/ACC pin has internal pullup
to V
CC
Temporary Sector Group Unprotect
(
Note:
In this device, a sector group consists of four adjacent
sectors that are protected or unprotected at the same time
(see
Table 6
).
This feature allows temporary unprotection of previ-
ously protected sector groups to change data in-sys-
tem. The Sector Group Unprotect mode is activated by
setting the RESET# pin to
VID
. During this mode, for-
merly protected sector groups can be programmed or
erased by selecting the sector group addresses. Once
V
ID
is removed from the RESET# pin, all the previ-
ously protected sector groups are protected again.
Figure 1 shows the algorithm, and Figure 23 shows
the timing diagrams, for this feature.
Figure 1.
Temporary Sector Group
Unprotect Operation
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Group Unprotect
Completed (Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sector groups unprotected (If WP# = V
IL
,
the first or last sector will remain protected).
2. All previously protected sector groups are protected
once again.
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