Datasheet
©2011 Silicon Storage Technology, Inc. DS25085A 10/11
21
8 Mbit Firmware Hub
SST49LF008A
Data Sheet
A
Microchip Technology Company
Software Command Sequence
Table 9: Software Command Sequence
Command
Sequence
1st
1
Write Cycle
1. FWH Mode uses consecutive Write cycles to complete a command sequence; PP Mode uses consecutive bus cycles to
complete a command sequence.
2nd
1
Write Cycle
3rd
1
Write Cycle
4th
1
Write Cycle
5th
1
Write Cycle
6th
1
Write Cycle
Addr
2
2. Address format A
14
-A
0
(Hex), Addresses A
21
-A
15
can be V
IL
or V
IH
, but no other value, for the Command sequence in
PP Mode.
Data Addr
2
Data Addr
2
Data Addr
2
Data Addr
2
Data Addr
2
Data
Byte-Program 5555H AAH 2AAAH 55H 5555H A0H BA
3
3. BA = Program Byte address
Data
Sector-Erase 5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H SA
X
4
4. SA
X
for Sector-Erase Address
30H
Block-Erase 5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H BA
X
5
5. BA
X
for Block-Erase Address
50H
Chip-Erase
6
6. Chip-Erase is supported in PP Mode only
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H 5555H 10H
Software ID Entry
7,8
7. SST Manufacturer’s ID = BFH, is read with A
0
=0,
With A
19
-A
1
= 0; 49LF008A Device ID = 5AH, is read with A
0
=1.
8. The device does not remain in Software Product ID mode if powered down.
5555H AAH 2AAAH 55H 5555H 90H
Software ID Exit
9
9. Both Software ID Exit operations are equivalent.
XXH F0H
Software ID Exit
9
5555H AAH 2AAAH 55H 5555H F0H
T9.6 25085