SST39LF200A_11 Datasheet, PDF (10/37 Pages) Microchip Technology – Mbit / 4 Mbit / 8 Mbit (x16) Multi-Purpose Flash

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2 Mbit / 4 Mbit / 8 Mbit Multi-Purpose Flash
SST39LF200A / SST39LF400A / SST39LF800A
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
X¹
Standby
Write Inhibit
Product Identification
Software Mode
V_IH
X
X
V_IL
X
X
V_IL
V_IL
1. X can be V_IL or V_IH, but no other value.
X High Z
X High Z/ D_OUT
V_IH High Z/ D_OUT
V_IH
Address
A_IN
A_IN
Sector or Block address,
XXH for Chip-Erase
X
X
X
See Table 4
T3.4 25001
Table 4: Software Command Sequence
Command
Sequence
1st Bus
2nd Bus
3rd Bus
4th Bus
5th Bus
6th Bus
Write Cycle Write Cycle Write Cycle Write Cycle Write Cycle Write Cycle
Word-Program
Sector-Erase
Block-Erase
Chip-Erase
Addr
1
5555H
5555H
5555H
5555H
Data
2
AAH
AAH
AAH
AAH
Addr¹
2AAAH
2AAAH
2AAAH
2AAAH
Data
2
55H
55H
55H
55H
Addr
1
5555H
5555H
5555H
5555H
Data
2
A0H
80H
80H
80H
Addr
1
WA³
5555H
5555H
5555H
Data
2
Data
AAH
AAH
AAH
Addr¹
2AAAH
2AAAH
2AAAH
Data
2
55H
55H
55H
Addr
1
SA_X4
BA_X4
5555H
Data
2
30H
50H
10H
Software ID
Entry^5,6
5555H AAH 2AAAH 55H 5555H 90H
CFI Query Entry⁵ 5555H AAH 2AAAH 55H 5555H 98H
Software ID Exit⁷/ XXH F0H
CFI Exit
Software ID Exit⁷/ 5555H AAH 2AAAH 55H 5555H F0H
CFI Exit
T4.3 25001
1. Address format A₁₄-A₀ (Hex), Addresses A_MS-A₁₅ can be V_IL or V_IH, but no other value, for the Command sequence.
A_MS = Most significant address
A_MS = A₁₆ for SST39LF/VF200A, A₁₇ for SST39LF/VF400A, and A₁₈ for SST39LF/VF800A
2. DQ₁₅-DQ₈ 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