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M29W160DB Datasheet(PDF) 12 Page - STMicroelectronics

Part # M29W160DB
Description  16 Mbit (2Mb x8 or 1Mb x16, Boot Block) 3V Supply Flash Memory
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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Table 3. Bus Operations, BYTE = VIH
Note: X = VIL or VIH.
COMMAND INTERFACE
All Bus Write operations to the memory are inter-
preted by the Command Interface. Commands
consist of one or more sequential Bus Write oper-
ations. Failure to observe a valid sequence of Bus
Write operations will result in the memory return-
ing to Read mode. The long command sequences
are imposed to maximize data security.
The address used for the commands changes de-
pending on whether the memory is in 16-bit or 8-
bit mode. See either Table 4, or 5, depending on
the configuration that is being used, for a summary
of the commands.
Read/Reset Command. The Read/Reset com-
mand returns the memory to its Read mode where
it behaves like a ROM or EPROM, unless other-
wise stated. It also resets the errors in the Status
Register. Either one or three Bus Write operations
can be used to issue the Read/Reset command.
The Read/Reset Command can be issued, be-
tween Bus Write cycles before the start of a pro-
gram or erase operation, to return the device to
read mode. Once the program or erase operation
has started the Read/Reset command is no longer
accepted. The Read/Reset command will not
abort an Erase operation when issued while in
Erase Suspend.
Auto Select Command. The Auto Select com-
mand is used to read the Manufacturer Code, the
Device Code and the Block Protection Status.
Three consecutive Bus Write operations are re-
quired to issue the Auto Select command. Once
the Auto Select command is issued the memory
remains in Auto Select mode until a Read/Reset
command is issued. Read CFI Query and Read/
Reset commands are accepted in Auto Select
mode, all other commands are ignored.
From the Auto Select mode the Manufacturer
Code can be read using a Bus Read operation
with A0 = VIL and A1 = VIL. The other address bits
may be set to either VIL or VIH. The Manufacturer
Code for STMicroelectronics is 0020h.
The Device Code can be read using a Bus Read
operation with A0 = VIH and A1 = VIL. The other
address bits may be set to either VIL or VIH.The
Device Code for the M29W160DT is 22C4h and
for the M29W160DB is 2249h.
The Block Protection Status of each block can be
read using a Bus Read operation with A0 = VIL,
A1 = VIH, and A12-A19 specifying the address of
the block. The other address bits may be set to ei-
ther VIL or VIH. If the addressed block is protect-
ed then 01h is output on Data Inputs/Outputs
DQ0-DQ7, otherwise 00h is output.
Program Command. The
Program
command
can be used to program a value to one address in
the memory array at a time. The command re-
quires four Bus Write operations, the final write op-
eration latches the address and data in the internal
state machine and starts the Program/Erase Con-
troller.
If the address falls in a protected block then the
Program command is ignored, the data remains
unchanged. The Status Register is never read and
no error condition is given.
During the program operation the memory will ig-
nore all commands. It is not possible to issue any
command to abort or pause the operation. Typical
program times are given in Table 6. Bus Read op-
erations during the program operation will output
the Status Register on the Data Inputs/Outputs.
See the section on the Status Register for more
details.
Operation
E
G
W
Address Inputs
A0-A19
Data Inputs/Outp uts
DQ15A–1, DQ14-DQ0
Bus Read
VIL
VIL
VIH
Cell Address
Data Output
Bus Write
VIL
VIH
VIL
Command Address
Data Input
Output Disable
X
VIH
VIH
X
Hi-Z
Standby
VIH
X
X
X
Hi-Z
Read Manufacturer
Code
VIL
VIL
VIH
A0 = VIL,A1 = VIL,A9 = VID,
Others VIL or VIH
0020h
Read Device Code
VIL
VIL
VIH
A0 = VIH,A1 = VIL,A9 = VID,
Others VIL or VIH
22C4h (M29W160DT)
2249h (M29W160DB)


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