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零件编号
产品描述 (功能)
AM29F004BT-90JF 查看數據表(PDF) - Spansion Inc.
零件编号
产品描述 (功能)
生产厂家
AM29F004BT-90JF
4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
Spansion Inc.
AM29F004BT-90JF Datasheet PDF : 37 Pages
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DATA SHEET
Increment
PLSCNT
No
START
PLSCNT = 1
Set OE# = V
ID
.
Write Sector
Unlock sequence
with command 24h
Wait 1
μ
s
Write 60h to any
address with
A6 = 0, A5 = 1,
A1 = 1, A0 = 0
Set up sector
address
Sector Protect:
Write 60h to sector
address with
A6 = 0, A5 = 1,
A1 = 1, A0 = 0
Wait 150 ± 15 µs
Set OE# = V
IH
Verify Sector
Protect: Write 40h
to sector address
with A6 = 0,
A1 = 1, A0 = 0
Set OE# = V
IL
Read from
sector address
with A6 = 0,
A1 = 1, A0 = 0
(requires 1 µs
access time)
Reset
PLSCNT = 1
PLSCNT
= 25?
Yes
Device failed
No
Data = 01h?
Yes
Protect another
Yes
sector?
No
Set OE# = V
ID
.
Write Sector
Relock sequence.
Set OE# = V
IH
.
Sector Protect
Algorithm
Sector Protect
complete
Protect all sectors:
The indicated portion
of the sector protect
algorithm must be
performed for all
unprotected sectors
prior to issuing the
first sector
unprotect address
START
PLSCNT = 1
Set OE# = V
ID
.
Write Sector
Unlock sequence
with command 24h
Wait 1
μ
s
Write 60h to
any address with
A6 = 1, A5 = 1,
A1 = 1, A0 = 0
No
All sectors
protected?
Increment
PLSCNT
No
Yes
Set up first sector
address
Sector Unprotect:
Write 60h to sector
address with
A6 = 1, A5 = 1,
A1 = 1, A0 = 0
Set OE# = V
IH
Wait 15 ± 1.5 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A6 = 1, A1 = 1,
A0 = 0
Set OE# = V
IL
Read from
sector address
with A6 = 1,
A1 = 1, A0 = 0
(requires 1 µs
access time)
PLSCNT
= 1000?
No
Data = 00h?
Yes
Yes
Device failed
Last sector
No
verified?
Yes
Sector Unprotect
Algorithm
Set OE# = V
ID
.
Write Sector
Relock sequence.
Set OE# = V
IH
.
Set up
next sector
address
Sector Unprotect
complete
Figure 1. In-System Sector Protect/Sector Unprotect Algorithms
May 9, 2006 Am29F004B_00
_
E4
Am29F004B
11
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