P320DT90VI datasheet(26/49 Pages) AMD

Part #	P320DT90VI

Description	32 Megabit (2 M x 16-Bit/1 M x 32-Bit) CMOS 3.0 Volt-only High Performance Page Mode Flash Memory

PDF	49 Pages

Scroll/Zoom	100%

Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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26 / 49 page

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)

P320DT90VI Datasheet(PDF) 26 Page - Advanced Micro Devices