START
RESET=V ID
Wait 4 us
Temporary Sector Group
Unprotect Mode
No
Protect Sector Group?
Yes
Sector Group
Protection (Unprotect) Mode
Address=Don't care
Data=60H
Pulse Count=1
Sector Group Protection
(A6, A1, A0)=(V IL, VIH, VIL),
Address=SGA, Data=60H
Increment Pulse Count
Timeout 250us
Verify Sector Group Protection
(A6, A1, A0)=(V IL, VIH, VIL),
Address=SGA, Data=40H
A29L323 Series
No
Data=01H?
Yes
Remove VID from RESET,
Write Reset Command
Fail
Read from Sector Group Address
(A6, A1, A0)=(V IL, VIH, VIL),
Address=SGA
No
Data=01H?
Yes
Protect Other
Sector Group?
No
Remove V ID from RESET,
Write Reset Command
Yes
Next Sector Group Address
Sector Group Protect Complete
Figure 1. Sector Group Protection Flow Chart
PRELIMINARY (May, 2002, Version 0.0)
17
AMIC Technology, Inc.