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AM29F004B Datenblatt(PDF) 13 Page - SPANSION

Teilenummer AM29F004B
Bauteilbeschribung  4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
PDF  37 Pages
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AM29F004B Datenblatt(HTML) 13 Page - SPANSION

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May 9, 2006 Am29F004B_00_E4
Am29F004B
11
D A TA
SH EE T
Figure 1.
In-System Sector Protect/Sector Unprotect Algorithms
Sector Protect:
Write 60h to sector
address with
A6 = 0, A5 = 1,
A1 = 1, A0 = 0
Set up sector
address
Wait 150 ± 15 µs
Verify Sector
Protect: Write 40h
to sector address
with A6 = 0,
A1 = 1, A0 = 0
Read from
sector address
with A6 = 0,
A1 = 1, A0 = 0
(requires 1 µs
access time)
START
PLSCNT = 1
Set OE# = VID.
Write Sector
Unlock sequence
with command 24h
Wait 1
μs
Data = 01h?
Set OE# = VID.
Write Sector
Relock sequence.
Set OE# = VIH.
Sector Protect
complete
Yes
Yes
No
PLSCNT
= 25?
Yes
Device failed
Increment
PLSCNT
Sector Unprotect:
Write 60h to sector
address with
A6 = 1, A5 = 1,
A1 = 1, A0 = 0
Set up first sector
address
Wait 15 ± 1.5 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A6 = 1, A1 = 1,
A0 = 0
Read from
sector address
with A6 = 1,
A1 = 1, A0 = 0
(requires 1 µs
access time)
START
PLSCNT = 1
Set OE# = VID.
Write Sector
Unlock sequence
with command 24h
Wait 1
μs
Data = 00h?
Last sector
verified?
Sector Unprotect
complete
Yes
No
PLSCNT
= 1000?
Yes
Device failed
Increment
PLSCNT
No
All sectors
protected?
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
Set up
next sector
address
No
No
Yes
No
Yes
No
Sector Protect
Algorithm
Sector Unprotect
Algorithm
Write 60h to
any address with
A6 = 1, A5 = 1,
A1 = 1, A0 = 0
Write 60h to any
address with
A6 = 0, A5 = 1,
A1 = 1, A0 = 0
Protect another
sector?
Reset
PLSCNT = 1
Set OE# = VID.
Write Sector
Relock sequence.
Set OE# = VIH.
Set OE# = VIL
Set OE# = VIH
Set OE# = VIH
Set OE# = VIL



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