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4 Mbit (x16) Multi-Purpose Flash
A Microchip Technology Company
SST39WF400B
Data Sheet
Operations
Table 3: Operation Modes Selection
Mode
Read
Program
Erase
CE#
V IL
V IL
V IL
OE#
V IL
V IH
V IH
WE#
V IH
V IL
V IL
DQ
D OUT
D IN
X 1
Address
A IN
A IN
Sector or Block address,
XXH for Chip-Erase
Standby
Write Inhibit
V IH
X
X
X
V IL
X
X
X
V IH
High Z
High Z/ D OUT
High Z/ D OUT
X
X
X
Product Identification
Software Mode
V IL
V IL
V IH
See Table 4
T3.0 25034
1. X can be V IL or V IH , but no other value.
Table 4: Software Command Sequence
Command
Sequence
1st Bus
Write Cycle
2nd Bus
Write Cycle
3rd Bus
Write Cycle
4th Bus
Write Cycle
5th Bus
Write Cycle
6th Bus
Write Cycle
Addr 1
Data 2
Addr 1
Data 2
Addr 1
Data 2
Addr 1
Data 2
Addr 1
Data 2
Addr 1
Data 2
Word-Program
5555H
AAH
2AAAH
55H
5555H
A0H
WA 3
Data
Sector-Erase
Block-Erase
Chip-Erase
5555H
5555H
5555H
AAH
AAH
AAH
2AAAH
2AAAH
2AAAH
55H
55H
55H
5555H
5555H
5555H
80H
80H
80H
5555H
5555H
5555H
AAH
AAH
AAH
2AAAH
2AAAH
2AAAH
55H
55H
55H
SA X4
BA X4
5555H
30H
50H
10H
Software ID Entry 5,6
SST CFI Query
5555H
5555H
AAH
AAH
2AAAH
2AAAH
55H
55H
5555H
5555H
90H
98H
Entry 5
General CFI Query
Mode
Software ID Exit 7 /
CFI Exit
55H
XXH
98H
F0H
Software ID Exit 7 /
5555H
AAH
2AAAH
55H
5555H
F0H
CFI Exit
T4.0 25034
1. Address format A 14 -A 0 (Hex), Addresses A MS- A 15 can be V IL or V IH , but no other value, for the Command sequence.
A MS = Most significant address
A MS = A 17 for SST39WF400B
2. DQ 15 -DQ 8 can be V IL or V IH , but no other value, for the Command sequence
3. WA = Program word address
4. SA X for Sector-Erase; uses A MS -A 11 address lines
BA X for Block-Erase; uses A MS -A 15 address lines
5. The device does not remain in Software Product ID mode if powered down.
6. With A MS -A 1 = 0; SST Manufacturer’s ID = 00BFH, is read with A 0 = 0,
SST39WF400B Device ID = 272EH, is read with A 0 = 1.
7. Both Software ID Exit operations are equivalent
?2011 Silicon Storage Technology, Inc.
11
DS25034A
09/11
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