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Equal sector architecture
ID sector address
Sector
Addresses
Size (Kbytes)
A18
0
A17
0
A16
0
0
1
2
3
4
5
6
7
00000h–0FFFFh
10000h–1FFFFh
20000h–2FFFFh
30000h–3FFFFh
40000h–4FFFFh
50000h–5FFFFh
60000h–6FFFFh
70000h–7FFFFh
64
64
64
64
64
64
64
64
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
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Mode
A18–A16
A9
A8–A7 A6
A5–A2
A1
A0
L
Code on DQ0–DQ7
MFG code (Alliance
Semiconductor)
X
V
X
L
L
L
X
L
L
H
52h
ID
Device code
X
V
X
X
H
L
A4h
ID
Sector
address
Sector
Sector
address
01h protected
00h unprotected
Sector protection
V
ID
address
L = Low (<V ); H = High (>V ); X = Don’t care.
IL
IH
&RPPDQG#IRUPDW
1st bus write
cycle
bus cycles Address
2nd bus write
cycle
Address
3rd bus write
cycle
4th bus read/ write
cycle
5th bus write
cycle
6th bus write
cycle
Command
sequence
Required
Data
F0h
Data
Address
Data
Address
Data
Address
Data
Address
Data
Read
Address
Read
Data
Reset/ read
Reset/ read
1
4
XXXXh
5555h
Read
Address
Read
Data
AAh
AAh
2AAAh
55h
55h
5555h
F0h
00h
MFR code
52h
A4h
01h
Autoselect ID
read
4
5555h
2AAAh
5555h
90h Device code
XXX02h
Sector
protection
01 = protected
00 = unprotected
Program
A0h
Program
Data
Program
4
6
6
5555h
5555h
5555h
AAh
AAh
AAh
2AAAh
2AAAh
2AAAh
55h
55h
55h
5555h
5555h
5555h
Address
Chip erase
Sector erase
80h
80h
5555h
5555h
AAh
2AAAh
2AAAh
55h
55h
5555h
10h
30h
Sector
Address
AAh
Sector erase
suspend
1
1
XXXXh
XXXXh
B0h
30h
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 ]
