AM29LV640MB110REI Spansion Inc., AM29LV640MB110REI Datasheet - Page 43

• Manufacturer Part Number: AM29LV640MB110REI
• Manufacturer: Spansion Inc.

Specifications of AM29LV640MB110REI

• Cell Type: NOR
• Density: 64Mb
• Access Time (max): 110ns
• Interface Type: Parallel
• Boot Type: Bottom
• Address Bus: 23/22Bit
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Program/erase Volt (typ): 3 to 3.6V
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 8M/4M
• Supply Current: 20mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Not Compliant

other system tasks. In this case, the system must start
at the beginning of the algorithm when it returns to de-
termine the status of the operation (top of
DQ5: Exceeded Timing Limits
DQ5 indicates whether the program, erase, or
write-to-buffer time has exceeded a specified internal
pulse count limit. Under these conditions DQ5 produces a
“1,” indicating that the program or erase cycle was not suc-
cessfully completed.
The device might output a “1” on DQ5 if the system
tries to program a “1” to a location that was previously
programmed to “0.” Only an erase operation can
change a “0” back to a “1.” Under this condition, the
device halts the operation, and when the timing limit
has been exceeded, DQ5 produces a “1.”
In all these cases, the system must write the reset
command to return the device to the reading the array
(or to erase-suspend-read if the device was previously
in the erase-suspend-program mode).
DQ3: Sector Erase Timer
After writing a sector erase command sequence, the
system can read DQ3 to determine whether or not
erasure has begun. (The sector erase timer does not
apply to the chip erase command.) If additional
sectors are selected for erasure, the entire time-out
also applies after each additional sector erase com-
mand. When the time-out period is complete, DQ3
Notes:
1. DQ5 switches to ‘1’ when an Embedded Program, Embedded Erase, or Write-to-Buffer operation has exceeded the
2. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further details.
3. The Data# Polling algorithm should be used to monitor the last loaded write-buffer address location.
4. DQ1 switches to ‘1’ when the device has aborted the write-to-buffer operation.
February 1, 2007 26190C8
Standard
Suspend
Suspend
Program
Write-to-
maximum timing limits. See
Erase
Buffer
Mode
Mode
Mode
Embedded Program Algorithm
Embedded Erase Algorithm
Erase-Suspend-Program
(Embedded Program)
Busy
Abort
Program-
Suspend
Suspend
Erase-
Read
Read
(Note 3)
(Note 4)
Status
Program-Suspended
Sector
Non-Program
Suspended Sector
Erase-Suspended
Sector
Non-Erase Suspended
Sector
DQ5: Exceeded Timing Limits
Table 14. Write Operation Status
Figure
D A T A
(Note 2)
DQ7#
DQ7#
DQ7#
DQ7#
Am29LV640MT/B
DQ7
9).
0
1
for more information.
No toggle
S H E E T
Toggle
Toggle
Toggle
Toggle
Toggle
DQ6
switches from a “0” to a “1.” If the time between addi-
tional sector erase commands from the system can be
assumed to be less than 50 µs, the system need not
monitor DQ3. See also
quence on page 33
After the sector erase command is written, the system
should read the status of DQ7 (Data# Polling) or DQ6
(Toggle Bit I) to ensure that the device has accepted
the command sequence, and then read DQ3. If DQ3 is
“1,” the Embedded Erase algorithm has begun; all fur-
ther commands (except Erase Suspend) are ignored
until the erase operation is complete. If DQ3 is “0,” the
device accepts additional sector erase commands. To
ensure the command has been accepted, the system
software should check the status of DQ3 prior to and
following each subsequent sector erase command. If
DQ3 is high on the second status check, the last com-
mand might not have been accepted.
Table 14
status bits.
DQ1: Write-to-Buffer Abort
DQ1 indicates whether a Write-to-Buffer operation
was aborted. Under these conditions DQ1 produces a
“ 1 ” .
Write-to-Buffer-Abort-Reset command sequence to re-
turn the device to reading array data. See
Programming on page 29
Invalid (not allowed)
T h e
(Note 1)
shows the status of DQ3 relative to the other
DQ5
0
0
0
0
0
0
Data
Data
s y s t e m
DQ3
N/A
N/A
N/A
N/A
N/A
.
1
Sector Erase Command Se-
for more details.
No toggle
(Note 2)
Toggle
Toggle
DQ2
m u s t
N/A
N/A
N/A
i s s u e
DQ1
N/A
N/A
N/A
0
0
1
Write Buffer
RY/BY#
0
0
1
1
1
1
0
0
0
t h e
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