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AM29F004B Datasheet(PDF) 31 Page - SPANSION

Part # AM29F004B
Description  4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
PDF  37 Pages
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Manufacturer  SPANSION [SPANSION]
Direct Link  http://www.spansion.com
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AM29F004B Datasheet(HTML) 31 Page - SPANSION

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May 9, 2006 Am29F004B_00_E4
Am29F004B
29
D A TA
SH EE T
AC CHARACTERISTICS
Notes:
1.
To enable the command mode sector protection/unprotection
algorithm, the system must issue the command 24h in the sector
unlock sequence.
2.
For sector protection, a valid address consists of the sector
address with A6 = 0, A5 = 1, A1 = 1, A0 = 0. For sector
unprotection, a valid address consists of the sector address with
A6 = 1, A5 = 1, A1 = 1, A0 = 0.
Figure 18.
Sector Protect/Unprotect Timing Diagram
OE#
A18 – A0
D7 – D0
CE#
WE#
60h
XXXh
60h
Valid (Note 2)
Valid (Note 2)
40h
VID
Sector Relock sequence (two cycles)
Sector Unlock sequence (three cycles)
VSS
Array Data
VIH



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