A29001/A290011 Series
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.
START
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/O7 - I/O0. The system can use I/O7, or I/O6 and
I/O2 together, to determine if a sector is actively erasing or
is erase-suspended. See "Write Operation Status" for
information on these status bits.
Write Erase
Command
Sequence
Data Poll
from System
Embedded
Erase
algorithm in
progress
No
Data = FFh ?
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/O7 or I/O6 status bits,
just as in the standard program operation. See "Write
Operation Status" for more information.
Yes
Erasure Completed
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.
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
command sequences.
2. See "I/O
3
: Sector Erase Timer" for more information.
Figure 3. Erase Operation
(December, 2004, Version 1.3)
10
AMIC Technology, Corp.
AMICC [ AMIC TECHNOLOGY ]
