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A29L004AY Datasheet(PDF) 10 Page - AMIC Technology

Part # A29L004AY
Description  512K X 8 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory
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Manufacturer  AMICC [AMIC Technology]
Direct Link  http://www.amictechnology.com
Logo AMICC - AMIC Technology

A29L004AY Datasheet(HTML) 10 Page - AMIC Technology

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A29L004A Series
PRELIMINARY
(March, 2005, Version 0.0)
9
AMIC Technology, Corp.
START
PLSCNT=1
RESET=V ID
Wait 1 us
First Write
Cycle=60h?
Set up sector
address
Sector Protect
Write 60h to sector
address with A6=0,
A1=1, A0=0
Wait 150 us
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
Data=01h?
Protect another
sector?
Remove V ID
from RESET
Write reset
command
Sector Protect
complete
Sector Protect
Algorithm
Temporary Sector
Unprotect Mode
Increment
PLSCNT
PLSCNT
=25?
Device failed
No
No
No
Yes
Reset
PLSCNT=1
Yes
Yes
No
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
RESET=V ID
Wait 1 us
First Write
Cycle=60h?
No
Temporary Sector
Unprotect Mode
Yes
No
All sectors
protected?
Set up first sector
address
Sector Unprotect:
Write 60h to sector
address with A6=1,
A1=1, A0=0
Wait 15 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
Data=00h?
Last sector
verified?
Remove VID
from RESET
Write reset
Command
Sector Unprotect
complete
Yes
Yes
Set up
next sector
address
No
Yes
Yes
Sector Unprotect
Algorithm
Increment
PLSCNT
PLSCNT=
1000?
Device failed
Yes
No
No
Figure 2. In-System Sector Protect/Unprotect Algorithms


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