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P320DT90VI bảng dữ liệu(PDF) 26 Page - Advanced Micro Devices

tên linh kiện P320DT90VI
Giải thích chi tiết về linh kiện  32 Megabit (2 M x 16-Bit/1 M x 32-Bit) CMOS 3.0 Volt-only High Performance Page Mode Flash Memory
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
Logo AMD - Advanced Micro Devices

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Am29PL320D
June 13, 2005
Temporary Sector Unprotect Enable/Dis-
able Command Sequence
The temporary unprotect command sequence is a
four-bus-cycle operation. The sequence is initiated by
writing two unlock write cycles. A third write cycle sets
up the command. The fourth and final write cycle en-
ables or disables the temporary unprotect feature. If
the temporary unprotect feature is enabled, all sectors
are temporarily unprotected. The system may program
or erase data as needed. When the system writes the
temporary unprotect disable command sequence, all
sectors return to their previous protected or unpro-
tected settings. See Table 13 and Figure 4 for more
information.
Notes:
1. All protected sectors are unprotected. If WP# = VIL, the
first or last 64 KByte sector will remain protected.
2. All previously protected sectors are protected once again.
Figure 4.
Temporary Sector Unprotect Algorithm
START
Write Temporary Sector
Unprotect Enable
Command Sequence
Write Temporary Sector
Unprotect Disable
Command Sequence
Perform Erase or
Program Operations
Procedure Complete
(Note 1)
(Note 2)



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