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M29F100T-70XM3R Datasheet(PDF) 6 Page - STMicroelectronics

Part # M29F100T-70XM3R
Description  1 Mbit 128Kb x8 or 64Kb x16, Boot Block Single Supply Flash Memory
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M29F100T-70XM3R Datasheet(HTML) 6 Page - STMicroelectronics

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Ready/Busy Output (RB). Ready/Busy is an
open-drainoutput and gives the internal state of the
P/E.C. of the device. When RB is Low, the device
is Busy with a Program or Erase operation and it
will not accept any additional program or erase
instructions except the Erase Suspend instruction.
When RB is High, the device is ready for any Read,
Program or Erase operation. The RB will also be
High when the memory is put in Erase Suspend or
Standby modes.
Reset/Block Temporary Unprotect Input (RP).
The RP Input provides hardware reset and pro-
tected block(s) temporary unprotection functions.
Reset of the memory is acheived by pulling RP 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 RP. If the memory is in Erase,
Erase Suspend or Program modes the reset will
take 10
µs during which the RB signal will be held
at VIL. The end of the memory reset will be indicated
by the rising edge of RB. A hardware reset during
an Erase or Program operation will corrupt the data
being programmed or the sector(s) being erased.
Temporary block unprotection is made by holding
RP at VID. In this condition previously protected
blocks can be programmed or erased. The transi-
tion of RP from VIH to VID must slower than 500ns.
When RP is returned from VID to VIH all blocks
temporarily unprotected will be again protected.
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.
Write. Write operations are used to give Instruction
Commands to the memory or to latch input data to
be programmed. A write operation is initiated when
Chip Enable E is Low and Write Enable W is Low
with Output Enable G High. Addresses are latched
on the falling edge of W or E whichever occurs last.
Commands and Input Data are latched on the rising
edge of W or E whichever occurs first.
Output Disable. The data outputs are high imped-
ance when the Output Enable G is High with Write
Enable W High.
Standby. The memory is in standby when Chip
Enable E is High and the P/E.C. is idle. The power
consumption is reduced to the standby level and
the outputs are high impedance, independent of
the Output Enable G or Write Enable W inputs.
Automatic Standby. After 150ns of bus inactivity
and when CMOS levels are driving the addresses,
the chip automatically enters a pseudo-standby
mode where consumptionis reduced to the CMOS
standby value, while outputs still drive the bus.
Electronic Signature. Two codes identifying the
manufacturer and the device can be read from the
memory. The manufacturer’s code for STMi-
croelectronics is 20h, the device code is D0h for the
M29F100T (Top Boot) and D1h for the M29F100B
(Bottom Boot). These codes allow programming
equipment or applications to automatically match
their interface to the characteristics of the
M29F100. The Electronic Signature is output by a
Read operation when the voltage applied to A9 is
at VID and address input A1 is Low. The manufac-
turer code is output when the Address input A0 is
Low and the device code when this input is High.
Other Address inputs are ignored. The codes are
output on DQ0-DQ7.
The Electronic Signature can also be read, without
raising A9 to VID, by giving the memory the Instruc-
tion AS. If the Byte-wide configuration is selected
the codes are output on DQ0-DQ7 with DQ8-DQ14
at High impedance; if the Word-wide configuration
is selected the codes are output on DQ0-DQ7 with
DQ8-DQ15 at 00h.
Block Protection. Each block can be separately
protected against Program or Erase on program-
ming equipment. Block protection provides addi-
tional data security, as it disables all program or
erase operations.This mode is activatedwhen both
A9 and G are raised to VID and an address in the
block is applied on A12-A15. The Block Protection
algorithm is shown in Figure 14. Block protection is
initiated on the edge of W falling to VIL. Then after
a delay of 100
µs, the edge of W rising to VIH ends
the protection operations. Block protection verify is
achieved by bringing G, E, A0 and A6 to VIL and A1
to VIH, while W is at VIH and A9 at VID. Underthese
conditions, reading the data output will yield 01h if
the block defined by the inputs on A12-A15 is
protected. Any attempt to program or erase a pro-
tected block will be ignored by the device.
6/30
M29F100T, M29F100B


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