Datasheet

©2011 Silicon Storage Technology, Inc. DS25001A 03/11
10
2 Mbit / 4 Mbit / 8 Mbit Multi-Purpose Flash
SST39LF200A / SST39LF400A / SST39LF800A
SST39VF200A / SST39VF400A / SST39VF800A
Data Sheet
A
Microchip Technology Company
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 CE# OE# WE# DQ Address
Read V
IL
V
IL
V
IH
D
OUT
A
IN
Program V
IL
V
IH
V
IL
D
IN
A
IN
Erase V
IL
V
IH
V
IL
X
1
1. X can be V
IL
or V
IH
, but no other value.
Sector or Block address,
XXH for Chip-Erase
Standby V
IH
X X High Z X
Write Inhibit X V
IL
X High Z/ D
OUT
X
XXV
IH
High Z/ D
OUT
X
Product Identification
Software Mode V
IL
V
IL
V
IH
See Table 4
T3.4 25001
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
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
Data
2
2. DQ
15
-DQ
8
can be V
IL
or V
IH
, but no other value, for the Command sequence
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
3. WA = Program word address
Data
Sector-Erase
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H SA
X
4
30H
Block-Erase
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H BA
X
4
50H
Chip-Erase
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H 5555H 10H
Software ID
Entry
5,6
5555H AAH 2AAAH 55H 5555H 90H
CFI Query Entry
5
5555H AAH 2AAAH 55H 5555H 98H
Software ID Exit
7
/
CFI Exit
XXH F0H
Software ID Exit
7
/
CFI Exit
5555H AAH 2AAAH 55H 5555H F0H
T4.3 25001