AM29LV320DT90EI AMD (ADVANCED MICRO DEVICES), AM29LV320DT90EI Datasheet - Page 28

• Manufacturer Part Number: AM29LV320DT90EI
• Description: Flash Memory IC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM29LV320DT90EI

• Memory Configuration: 4M X 8 / 2M X 16 Bit
• Package/case: 48-TSOP
• Supply Voltage Max: 3.6V
• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Access Time, Tacc: 90nS
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

time-out period resets the device to the
read mode. The system must rewrite the com-
mand sequence and any additional addresses
and commands.
The system can monitor DQ3 to determine if
the sector erase timer timed out (See the sec-
tion
The time-out begins from the rising edge of the
final WE# pulse in the command sequence.
When the Embedded Erase algorithm is com-
plete, the device returns to reading array data
and addresses are no longer latched. The sys-
tem can determine the status of the erase op-
eration by reading DQ7, DQ6, DQ2, or RY/BY#
in the erasing sector. Refer to
Status” on page 30
status bits.
Once the sector erase operation begins, only
the Erase Suspend command is valid. All other
commands are ignored. However, note that a
hardware reset immediately terminates the
erase operation. If that occurs, the sector erase
command sequence should be reinitiated once
the device returns to reading array data, to en-
sure data integrity.
Figure 5, on page 28
for the erase operation. Refer to table
and Program Operations” on page 41
rameters, and
diagrams.
Erase Suspend/Erase Resume Commands
The Erase Suspend command, B0h, allows the
system to interrupt a sector erase operation
and then read data from, or program data to,
any sector not selected for erasure. This com-
mand is valid only during the sector erase oper-
ation, including the 50 µs time-out period
during the sector erase command sequence.
The Erase Suspend command is ignored if writ-
ten during the chip erase operation or Embed-
ded Program algorithm.
When the Erase Suspend command is written
during the sector erase operation, the device
requires a maximum of 20 µs to suspend the
erase operation. However, when the Erase Sus-
pend command is written during the sector
erase time-out, the device immediately termi-
nates the time-out period and suspends the
erase operation.
After the erase operation is suspended, the de-
vice enters the erase-suspend-read mode. The
system can read data from or program data to
any sector not selected for erasure. (The device
“erase suspends” all sectors selected for era-
sure.) Reading at any address within erase-sus-
28
“DQ3: Sector Erase Timer” on page
Figure 19, on page 43
for information on these
illustrates the algorithm
“Write Operation
for timing
for pa-
“Erase
32.).
Am29LV320D
pended sectors produces status information on
DQ7–DQ0. The system can use DQ7, or DQ6
and DQ2 together, to determine if a sector is
actively erasing or is erase-suspended. Refer to
the
tion for information on these status bits.
After an erase-suspended program operation is
complete, the device returns to the erase-sus-
pend-read mode. The system can determine
the status of the program operation using the
DQ7 or DQ6 status bits, just as in the standard
Byte Program operation. Refer to
tion Status” on page 30
In the erase-suspend-read mode, the system
can also issue the autoselect command se-
quence. Refer to
an d
page 25
To resume the sector erase operation, the sys-
tem must write the Erase Resume command.
Further writes of the Resume command are ig-
nored. Another Erase Suspend command can
be written after the chip resumes erasing.
Notes:
1. See
2. See the section on DQ3 for information on the
sequence.
sector erase timer.
“Write Operation Status” on page 30
“A uto se le ct C om m a nd Se qu en ce” on
Table 14, on page 29
No
for details.
Figure 5. Erase Operation
Command Sequence
Data Poll to Erasing
Erasure Completed
Bank from System
Write Erase
Data = FFh?
(Notes 1, 2)
START
“Autoselect Mode” on page 16
Yes
for more information.
for erase command
Embedded
Erase
algorithm
in progress
November 15, 2004
“Write Opera-
sec-