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8 Mbit Firmware Hub
A Microchip Technology Company
SST49LF008A
Data Sheet
Software Command Sequence
Table 9: Software Command Sequence
Command
Sequence
1st 1
Write Cycle
2nd 1
Write Cycle
3rd 1
Write Cycle
4th 1
Write Cycle
5th 1
Write Cycle
6th 1
Write Cycle
Addr 2 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
Data
Sector-Erase
Block-Erase
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H
SA X4
BA X5
30H
50H
Chip-Erase 6
Software ID Entry 7,8
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H 5555H 10H
5555H AAH 2AAAH 55H 5555H 90H
Software ID
Exit 9
XXH
F0H
Software ID Exit 9
5555H AAH 2AAAH 55H 5555H F0H
T9.6 25085
1. FWH Mode uses consecutive Write cycles to complete a command sequence; PP Mode uses consecutive bus cycles to
complete a command sequence.
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.
3. BA = Program Byte address
4. SA X for Sector-Erase Address
5. BA X for Block-Erase Address
6. Chip-Erase is supported in PP Mode only
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.
9. Both Software ID Exit operations are equivalent.
?2011 Silicon Storage Technology, Inc.
21
DS25085A
10/11
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