s29as008j Meet Spansion Inc., s29as008j Datasheet - Page 24

• Manufacturer Part Number: s29as008j
• Description: 8 Megabit 1 M X 8-bit/512 K X 16-bit Cmos 1.8 Volt-only Boot Sector Flash Memory
• Manufacturer: Meet Spansion Inc.

24
The Secured Silicon Sector protection must be used with caution since, once protected, there is no procedure
available for unprotecting the Secured Silicon Sector area, and none of the bits in the Secured Silicon Sector
memory space can be modified in any way.
D a t a
Figure 8.1 Secured Silicon Sector Protect Verify
S h e e t
Secured Silicon
Secured Silicon
Sector address
Sector address
A1 = 1, A0 = 0
A1 = 1, A0 = 0
A3 = A2 = 0,
Write 60h to
A3 = A2 = 0,
any address
Write 40h to
with A6 = 0,
with A6 = 0,
Read from
RESET# =
Wait 1 ms
V
S29AS008J
START
IH
or V
( A d v a n c e
ID
Remove V
Secured Silicon
Secured Silicon
Secured Silicon
Verify complete
Sector Protect
If data = 00h,
If data = 01h,
from RESET#
unprotected.
Write reset
protected.
command
Sector is
Sector is
I n f o r m a t i o n )
IH
or V
ID
S29AS008J_00_03 June 6, 2008