$6 /9
&RPPDQG IRUPDW
Command
sequence
Reset/Read
Reset/
Read
×16
×8
×16
×8
×16
Autosele
×8
ct
ID Read
×16
Required 1st bus cycle 2nd bus cycle
bus write
cycles Address Data Address Data
1
3
XXXh
555h
AAAh
555h
AAh
AAAh
555h
3
AAAh
555h
AAh
AAh
555h
2AAh
555h
2AAh
55h
555h
2AAh
555h
2AA
555
Program
address
XXX
2AAh
555h
2AAh
555h
55h
F0h
AAh
Read
Address
2AAh
555h
2AAh
55h
Read
Data
55h
3rd bus cycle
Address Data
4th bus cycle
Address
Data
5th bus cycle
6th bus cycle
Address Data Address Data
555h
AAAh
555h
F0h
Read Address
01h
Device code
02h
Device code
00h
MFR code
XXX02h
Sector
protection
XXX04h
Sector
protection
Program
Address
Read
Data
22B9h (T)
22BAh (B)
B9h(T)
BAh(B)
0052h
52h
0001h = protected
0000h = unprotected
0001h=protected
0000h=unprotected
Program
Data
90h
AAAh
555h
AAAh
555h
90h
AAAh
555h
AAAh
555
AAA
90h
×8
×16
×8
×16
×8
AAAh
555h
AAAh
555
AAA
XXX
XXX
555h
AAAh
555h
AAAh
XXXh
XXXh
Program
Unlock
bypass
4
3
2
2
6
6
1
1
AAh
AAh
A0h
90h
AAh
AAh
B0h
30h
55h
55h
Program
data
00h
55h
55h
A0h
20h
Unlock bypass
program
Unlock bypass
reset
Chip
Erase
Sector
Erase
×16
×8
×16
×8
555h
AAAh
555h
AAAh
80h
80h
555h
AAAh
555h
AAAh
AAh
AAh
2AAh
555h
2AAh
555h
55h
55h
555h
AAAh
Sector
Address
10h
30h
Sector Erase
Suspend
Sector Erase
Resume
1
2
3
4
5
6
Bus operations defined in "Mode definitions," on page 3.
Reading from and programming to non-erasing sectors allowed in Erase
Suspend mode.
Address bits A11-A17 = X = Don’t Care for all address commands
except where Program Address and Sector Address are required.
Data bits DQ15-DQ8 are don’t care for unlock and command cycles.
The Unlock Bypass command must be initiated before the Unlock
Bypass Program command.
The Unlock Bypass Reset command returns the device to reading array
data when it is in the unlock bypass mode.
9/26/01; V.0.9.9.2
$OOLDQFH 6HPLFRQGXFWRU
P. 7 of 26
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
