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M29F800AT Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M29F800AT
Description  8 Mbit 1Mb x8 or 512Kb x16, Boot Block Single Supply Flash Memory
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M29F800AT Datasheet(HTML) 5 Page - STMicroelectronics

 
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M29F800AT, M29F800AB
Table 4A. Bus Operations, BYTE = VIL
Note: X = VIL or VIH.
Table 4B. Bus Operations, BYTE = VIH
Note: X = VIL or VIH.
Operation
E
G
W
Address Inputs
DQ15A–1, A0-A18
Data Inputs/Outpu ts
DQ14-DQ8
DQ7-DQ0
Bus Read
VIL
VIL
VIH
Cell Address
Hi-Z
Data Output
Bus Write
VIL
VIH
VIL
Command Address
Hi-Z
Data Input
Output Disable
X
VIH
VIH
X
Hi-Z
Hi-Z
Standby
VIH
X
X
X
Hi-Z
Hi-Z
Read Manufacturer
Code
VIL
VIL
VIH
A0 = VIL,A1 = VIL,A9 = VID,
Others VIL or VIH
Hi-Z
20h
Read Device Code
VIL
VIL
VIH
A0 = VIH,A1 = VIL,A9 = VID,
Others VIL or VIH
Hi-Z
ECh (M29F800AT)
58h (M29F800AB)
Operation
E
G
W
Address Inputs
A0-A18
Data Inputs/Outpu ts
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
00ECh (M29F800AT)
0058h (M29F800AB)
VCC Supply Voltage. The VCC Supply Voltage
supplies the power for all operations (Read, Pro-
gram, Erase etc.).
The Command Interface is disabled when the VCC
Supply Voltage is less than the Lockout Voltage,
VLKO. This prevents Bus Write operations from ac-
cidentally damaging the data during power up,
power down and power surges. If the Program/
Erase Controller is programming or erasing during
this time then the operation aborts and the memo-
ry
contents
being
altered
will
be
invalid.
A 0.1
µF capacitor should be connected between
the VCC Supply Voltage pin and the VSS Ground
pin to decouple the current surges from the power
supply. The PCB track widths must be sufficient to
carry the currents required during program and
erase operations, ICC4.
VSS Ground. The VSS Ground is the reference for
all voltage measurements.
BUS OPERATIONS
There are five standard bus operations that control
the device. These are Bus Read, Bus Write, Out-
put Disable, Standby and Automatic Standby. See
Tables 4A and 4B, Bus Operations, for a summa-
ry. Typically glitches of less than 5ns on Chip En-
able or Write Enable are ignored by the memory
and do not affect bus operations.
Bus Read. Bus Read operations read from the
memory cells, or specific registers in the Com-
mand Interface. A valid Bus Read operation in-
volves setting the desired address on the Address
Inputs, applying a Low signal, VIL, to Chip Enable
and Output Enable and keeping Write Enable
High, VIH. The Data Inputs/Outputs will output the
value, see Figure 7, Read Mode AC Waveforms,
and Table 11, Read AC Characteristics, for details
of when the output becomes valid.
Bus Write. Bus Write operations write to the
Command Interface. A valid Bus Write operation
begins by setting the desired address on the Ad-


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