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Equal sector architecture
Sector
Addresses
00000h–0FFFFh
10000h–1FFFFh
20000h–2FFFFh
30000h–3FFFFh
40000h–4FFFFh
50000h–5FFFFh
60000h–6FFFFh
70000h–7FFFFh
Size (Kbytes)
64
64
64
64
64
64
64
64
A18
0
0
0
0
1
1
1
1
0
1
2
3
4
5
6
7
ID sector address
A17
0
0
1
1
0
0
1
1
A16
0
1
0
1
0
1
0
1
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Mode
MFG code (Alliance
Semiconductor)
Device code
Sector protection
A18–A16
X
X
Sector
address
A9
V
ID
V
ID
V
ID
A8–A7
X
X
Sector
address
A6
L
L
L
A5–A2
X
X
Sector
address
A1
L
L
H
A0
L
H
L
Code on DQ0–DQ7
52h
A4h
01h protected
00h unprotected
L = Low (<V
IL
); H = High (>V
IH
); X = Don’t care.
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Command
sequence
Reset/read
Reset/read
Required
bus cycles
1
4
1st bus write
cycle
Address
XXXXh
5555h
Data
F0h
AAh
2nd bus write
cycle
Address
Read
Address
2AAAh
Data
Read
Data
55h
5555h
F0h
Read
Address
00h
MFR code
Autoselect ID
read
4
5555h
AAh
2AAAh
55h
5555h
90h
01h
Device code
XXX02h
Sector
protection
4
6
6
1
1
5555h
5555h
5555h
XXXXh
XXXXh
AAh
AAh
AAh
B0h
30h
2AAAh
2AAAh
2AAAh
55h
55h
55h
5555h
5555h
5555h
A0h
80h
80h
Program
Address
5555h
5555h
Read
Data
52h
A4h
01 = protected
00 = unprotected
Program
Data
AAh
AAh
2AAAh
2AAAh
55h
55h
5555h
Sector
Address
10h
30h
3rd bus write
cycle
Address
Data
4th bus read/write
cycle
Address
Data
5th bus write
cycle
Address
Data
6th bus write
cycle
Address
Data
Program
Chip erase
Sector erase
Sector erase
suspend
Sector erase
resume
1
2
3
4
5
6
Bus operations defined in "Mode definitions," on page 3.
Reading from or programming to non-erasing sectors allowed in Erase Suspend mode.
Address bit A15 = X = Don’t care for all address commands except Program Address.
Address bit A16 = X = Don’t care for all address commands except Program Address and Sector Address.
Address bit A17 = X = Don’t care for all address commands except Program Address and Sector Address.
Address bit A18 = X = Don’t care for all address commands except Program Address and Sector Address.
7
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ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
