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M295V002NT-120K1TR Datasheet(PDF) 5 Page - STMicroelectronics

Part # M295V002NT-120K1TR
Description  2 Mbit 256Kb x8, Boot Block Single Supply Flash Memory
Download  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M295V002NT-120K1TR Datasheet(HTML) 5 Page - STMicroelectronics

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Instructions
Seven instructions are defined to perform Read
Array, Auto Select (to read the ElectronicSignature
or Block Protection Status), Program, Block Erase,
Chip Erase, Erase Suspend and Erase Resume.
The internal P/E.C. automatically handles all tim-
ing and verification of the Program and Erase
operations. The Status Register Data Polling, Tog-
gle, Error bits may be read at any time, during
programming or erase, to monitor the progress of
the operation.
Instructions are composed of up to six cycles. The
first two cycles input a Coded sequence to the
Command Interfacewhich is common to all instruc-
tions (see Table 8). The third cycle inputs the
instruction set-up command. Subsequent cycles
output the addressed data, Electronic Signature or
Block Protection Status for Read operations. In
order to give additional data protection, the instruc-
tions for Program and Block or Chip Erase require
further command inputs. For a Program instruction,
the fourth command cycle inputs the address and
data to be programmed. For an Erase instruction
(Block or Chip), the fourth and fifth cycles input a
further Coded sequence before the Erase confirm
command on the sixth cycle. Erasure of a memory
block may be suspended,in orderto read data from
another block or to program data in another block,
and then resumed.
When power is first applied or if VCC falls below
VLKO, the command interface is reset to Read
Array.
SIGNAL DESCRIPTIONS
See Figure 1 and Table 1.
Address Inputs (A0-A17). The address inputs for
the memory array are latched during a write opera-
tion on the falling edge of Chip Enable E or Write
Enable W. When A9 is raised to VID, either a Read
ElectronicSignature Manufactureror Device Code,
Block Protection Status or a Write Block Protection
or Block Unprotection is enabled depending on the
combination of levels on A0, A1, A6, A12 and A15.
Data Input/Outputs (DQ0-DQ7). The input is data
to be programmed in the memory array or a com-
mand to be written to the C.I. Both are latched on
the rising edge of Chip Enable E or Write Enable
W. The output is data from the Memory Array, the
Electronic Signature Manufacturer or Device
codes, the Block Protection Status or the Status
register Data Polling bit DQ7, the Toggle Bits DQ6
and DQ2, the Error bit DQ5 or the Erase Timer bit
DQ3. Outputs are valid when Chip Enable E and
Output Enable G are active. The output is high
impedance when the chip is deselected or the
outputs are disabled and when RPNC is at a Low
level.
Chip Enable (E). The Chip Enable input activates
the memory control logic, input buffers, decoders
and sense amplifiers. E High deselectsthe memory
and reduces the power consumption to the standby
level. E can also be used to control writing to the
command register and to the memory array, while
W remains at a low level. The Chip Enable must be
forced to VID during the Block Unprotection opera-
tion.
Output Enable (G). The Output Enable gates the
outputs through the data buffers during a read
operation. When G is High the outputs are High
impedance. G must be forced to VID level during
Block Protection and Unprotection operations.
Write Enable (W). This input controls writing to the
Command Registerand Addressand Data latches.
Reset/Block Temporary Unprotect/No Connect
Input (RPNC). The RPNC (not available for the
M29F002NT) input provides hardware reset and
protected block(s) temporary unprotection func-
tions. In read or write mode, the RPNC pin can be
left open (Not Connected) or held at VIH. Reset of
the memory is acheived by pulling RPNC to VIL for
at least 500ns. When the reset pulse is given, if the
memory is in Read or Standby modes, it will be
available for new operations in 50ns after the rising
edge of RPNC. If the memory is in Erase, Erase
Suspend or Program modes the reset will take
10
µs. Ahardwareresetduringan Eraseor Program
operation will corrupt the data being programmed
or the sector(s) being erased.
Temporary block unprotection is made by holding
RPNC at VID. In this condition previously protected
blocks can be programmed or erased. The transi-
tion of RPNC from VIH to VID must slower than
500ns. When RPNC is returned from VID to VIH all
blocks temporarily unprotected will be again pro-
tected.
VCC Supply Voltage. The power supply for all
operations (Read, Program and Erase).
VSS Ground. VSS is the reference for all voltage
measurements.
DEVICE OPERATIONS
See Tables 4, 5 and 6.
Read. Read operations are used to output the
contents of the Memory Array, the Electronic Sig-
nature, the Status Register or the Block Protection
Status. Both Chip Enable E and Output Enable G
must be low in order to read the output of the
memory.
5/29
M29F002T, M29F002NT, M29F002B


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