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2 Mbit / 4 Mbit / 8 Mbit Multi-Purpose Flash
SST39LF200A / SST39LF400A / SST39LF800A
A Microchip Technology Company
SST39VF200A / SST39VF400A / SST39VF800A
Data Sheet
Product Identification Mode Exit/CFI Mode Exit
In order to return to the standard Read mode, the Software Product Identification mode must be exited.
Exit is accomplished by issuing the Software ID Exit command sequence, which returns the device to
the Read mode. This command may also be used to reset the device to the Read mode after any inad-
vertent transient condition that apparently causes the device to behave abnormally, e.g., not read cor-
rectly. Please note that the Software ID Exit/CFI Exit command is ignored during an internal Program
or Erase operation. See Table 4 for software command codes, Figure 15 for timing waveform, and Fig-
ure 20 for a flowchart.
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
T3.4 25001
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
Data
Data
Addr
Data
Addr
Data
Data
Addr
Data
1
2
Addr 1
2
1
2
1
2
Addr 1
2
1
2
Word-Program
5555H AAH
2AAAH
55H
5555H
A0H
WA 3
Data
Sector-Erase
Block-Erase
Chip-Erase
5555H AAH
5555H AAH
5555H 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
5555H AAH
2AAAH
55H
5555H
90H
Entry 5,6
CFI Query Entry 5
5555H AAH
2AAAH
55H
5555H
98H
Software ID Exit 7 /
CFI Exit
XXH
F0H
Software ID Exit 7 / 5555H AAH
2AAAH
55H
5555H
F0H
CFI Exit
T4.3 25001
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 16 for SST39LF/VF200A, A 17 for SST39LF/VF400A, and A 18 for SST39LF/VF800A
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
? 2011 Silicon Storage Technology, Inc.
10
DS25001A
03/11
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