AM29PL320D SPANSION [SPANSION], AM29PL320D Datasheet - Page 26

• Manufacturer Part Number: AM29PL320D
• Description: 32 Megabit (2 M x 16-Bit/1 M x 32-Bit) CMOS 3.0 Volt-only High Performance Page Mode Flash Memory
• Manufacturer: SPANSION [SPANSION]

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.
24
Am29PL320D
Notes:
1. All protected sectors are unprotected. If WP# = V
2. All previously protected sectors are protected once again.
Figure 4. Temporary Sector Unprotect Algorithm
first or last 64 KByte sector will remain protected.
Write Temporary Sector
Write Temporary Sector
Command Sequence
Command Sequence
Procedure Complete
Program Operations
Unprotect Disable
Unprotect Enable
Perform Erase or
START
October 2, 2003
(Note 1)
(Note 2)
IL
, the