A29L320 AMICC [AMIC Technology], A29L320 Datasheet - Page 20

• Manufacturer Part Number: A29L320
• Description: 4M X 8 Bit / 2M X 16 Bit CMOS 3.3 Volt-only, Boot Sector Flash Memory
• Manufacturer: AMICC [AMIC Technology]

The system can monitor I/O
timer has timed out. (See the " I/O
section.) The time-out begins from the rising edge of the final
Once the sector erase operation has begun, only the Erase
Suspend command is valid. All other commands are ignored.
When the Embedded Erase algorithm is complete, the device
returns to reading array data and addresses are no longer
latched. The system can determine the status of the erase
operation by using I/O
Operation Status" for information on these status bits.
4 illustrates the algorithm for the erase operation. Refer to
the
Characteristics" section for parameters, and to the Sector
Erase Operations Timing diagram for timing waveforms.
Erase Suspend/Erase Resume Commands
The Erase Suspend command 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
command is valid only during the sector erase operation,
including the 50µs time-out period during the sector erase
command sequence. The Erase Suspend command is
ignored if written during the chip erase operation or
Embedded Program algorithm. Writing the Erase Suspend
command during the Sector Erase time-out immediately
terminates the time-out period and suspends the erase
operation. Addresses are "don't cares" when writing the
Erase Suspend command.
When the Erase Suspend command is written during a
sector erase operation, the device requires a maximum of
20µs to suspend the erase operation. However, when the
Erase Suspend command is written during the sector erase
time-out, the device immediately terminates the time-out
period and suspends the erase operation.
After the erase operation has been suspended, the system
can read array data from or program data to any sector not
selected for erasure. (The device "erase suspends" all
sectors selected for erasure.) Normal read and write timings
and command definitions apply. Reading at any address
within erase-suspended sectors produces status data on I/O
- I/O
determine if a sector is actively erasing or is erase-
suspended. See "Write Operation Status" for information on
these status bits.
After an erase-suspended program operation is complete,
the system can once again read array data within non-
suspended sectors. The system can determine the status of
the program operation using the I/O
as in the standard program operation. See "Write Operation
Status" for more information.
The system may also write the autoselect command
sequence when the device is in the Erase Suspend mode.
The device allows reading autoselect codes even at
addresses within erasing sectors, since the codes are not
stored in the memory array. When the device exits the
autoselect mode, the device reverts to the Erase Suspend
mode, and is ready for another valid operation. See
"Autoselect Command Sequence" for more information.
PRELIMINARY
WE
0
. The system can use I/O
pulse in the command sequence.
Erase/Program
(September, 2005, Version 0.0)
Operations
7
, I/O
3
to determine if the sector erase
7
6
, or I/O
, or I/O
7
3
tables
: Sector Erase Timer"
or I/O
6
and I/O
2
. Refer to "Write
6
status bits, just
in
2
together, to
the
"AC
7
19
The system must write the Erase Resume command
(address bits are "don't care") to exit the erase suspend
mode and continue the sector erase operation. Further writes
of the Resume command are ignored. Another Erase
Suspend command can be written after the device has
resumed erasing.
Note :
1. See the appropriate Command Definitions table for erase
2. See "I/O
command sequences.
3
: Sector Erase Timer" for more information.
No
Figure 4. Erase Operation
AMIC Technology, Corp.
Erasure Completed
Data = FFh ?
from System
Write Erase
Command
Sequence
Data Poll
START
A29L320 Series
Yes
Embedded
Erase
algorithm in
progress