AM29F040B-120JF Spansion Inc., AM29F040B-120JF Datasheet - Page 13

• Manufacturer Part Number: AM29F040B-120JF
• Description: Flash Memory IC
• Manufacturer: Spansion Inc.

Specifications of AM29F040B-120JF

• Memory Size: 4Mbit
• Memory Configuration: 512K X 8
• Ic Interface Type: Parallel
• Access Time: 120ns
• Memory Case Style: PLCC
• No. Of Pins: 32
• Operating Temperature Range: -40°C To +85°C
• Termination Type: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Any commands written to the device during the Em-
bedded Program Algorithm are ignored.
Programming is allowed in any sequence and across
sector boundaries. A bit cannot be programmed
from a “0” back to a “1”. Attempting to do so may halt
the operation and set DQ5 to “1”, or cause the Data#
Polling algorithm to indicate the operation was suc-
cessful. However, a succeeding read shows that the
data is still “0”. Only erase operations can convert a “0”
to a “1”.
Note: See the appropriate Command Definitions table for
program command sequence.
Chip Erase Command Sequence
Chip erase is a six-bus-cycle operation. The chip erase
command sequence is initiated by writing two unlock
cycles, followed by a set-up command. Two additional
unlock write cycles are then followed by the chip erase
command, which in turn invokes the Embedded Erase
algorithm. The device does not require the system to
preprogram prior to erase. The Embedded Erase algo-
rithm automatically preprograms and verifies the entire
November 1, 2006 21445E5
Increment Address
Figure 1. Program Operation
in progress
Embedded
algorithm
Program
No
Command Sequence
Write Program
Last Address?
Programming
from System
Verify Data?
Completed
Data Poll
START
Yes
Yes
D A T A
Am29F040B
No
S H E E T
memory for an all zero data pattern prior to electrical
erase. The system is not required to provide any con-
trols or timings during these operations. The Command
Definitions table shows the address and data require-
ments for the chip erase command sequence.
Any commands written to the chip during the Embed-
ded Erase algorithm are ignored.
The system can determine the status of the erase op-
eration by using DQ7, DQ6, or DQ2. See
Operation Status”
When the Embedded Erase algorithm is complete, the
device returns to reading array data and addresses are
no longer latched.
Figure
tion. See the Erase and Program Operations tables in
“AC Characteristics”
Sector Erase Operation Timings for timing waveforms.
Sector Erase Command Sequence
Sector erase is a six bus cycle operation. The sector
erase command sequence is initiated by writing two un-
lock cycles, followed by a set-up command. Two
additional unlock write cycles are then followed by the
address of the sector to be erased, and the sector
erase command. The Command Definitions table
shows the address and data requirements for the sec-
tor erase command sequence.
The device does not require the system to preprogram
the memory prior to erase. The Embedded Erase algo-
rithm automatically programs and verifies the sector for
an all zero data pattern prior to electrical erase. The
system is not required to provide any controls or tim-
ings during these operations.
After the command sequence is written, a sector erase
time-out of 50 µs begins. During the time-out period,
additional sector addresses and sector erase com-
mands may be written. Loading the sector erase buffer
may be done in any sequence, and the number of sec-
tors may be from one sector to all sectors. The time
between these additional cycles must be less than 50
µs, otherwise the last address and command might not
be accepted, and erasure may begin. It is recom-
mended that processor interrupts be disabled during
this time to ensure all commands are accepted. The in-
terrupts can be re-enabled after the last Sector Erase
command is written. If the time between additional sec-
tor erase commands can be assumed to be less than
50 µs, the system need not monitor DQ3. Any com-
mand other than Sector Erase or Erase Suspend
during the time-out period resets the device to
reading array data. The system must rewrite the com-
mand sequence and any additional sector addresses
and commands.
The system can monitor DQ3 to determine if the sector
erase timer has timed out. (See the
2
illustrates the algorithm for the erase opera-
for information on these status bits.
for parameters, and to the Chip/
“DQ3: Sector Erase
“Write
11