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SST39WF400A Datasheet

  • SST39WF400A

  • 4 Mbit (x16) Multi-Purpose Flash

  • SST   SST

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4 Mbit Multi-Purpose Flash
SST39WF400A
Data Sheet
Product Identification
The Product Identification mode identifies the devices as
the SST39WF400A and manufacturer as SST. This mode
may be accessed by software operations. Users may use
the Software Product Identification operation to identify the
part (i.e., using the device ID) when using multiple
manufacturers in the same socket. For details, see Table 4
for software operation, Figure 11 for the Software ID Entry
and Read timing diagram, and Figure 18 for the Software
ID Entry command sequence flowchart.
TABLE 1: P
RODUCT
I
DENTIFICATION
T
ABLE
Address
Manufacturer鈥檚 ID
Device ID
SST39WF400A
0001H
272FH
T1.0 1220
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 accom-
plished 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 inadvertent transient condition that
apparently causes the device to behave abnormally, e.g.,
not read correctly. 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 13 for timing waveform, and Figure 18 for a
flowchart.
Data
00BFH
0000H
F
UNCTIONAL
B
LOCK
D
IAGRAM
X-Decoder
SuperFlash
Memory
Memory Address
Address Buffer & Latches
Y-Decoder
CE#
OE#
WE#
DQ15 - DQ0
1220 B1.0
Control Logic
I/O Buffers and Data Latches
漏2004 Silicon Storage Technology, Inc.
S71220-05-000
6/04
4

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