AS29LV016D Datasheet, PDF (20/40 Pages) Micross Components – Superior inadvertent write protection

COTS PEM
BOOT SECTOR FLASH
AS29LV016
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 50 μs 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 20 μs 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 DQ7–DQ0. The system can
use DQ7, or DQ6 and DQ2 together, to determine if a
sector is actively erasing or is erase-suspended. See
Write Operation Status on page 22 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 DQ7 or DQ6 status
bits, just as in the standard program operation. See Write
Operation Status on page 22 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 on page 17 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.
START
Write Erase
Command Sequence
Data Poll
from System
No
Data = FFh?
Embedded
Erase
algorithm
in progress
Yes
Erasure Completed
Notes:
1. See Table 9 on page 21 for erase command
sequence.
2. See DQ3: Sector Erase Timer on page 25 for more
information.
Figure 4. Erase Operation
AS29LV016
Rev. 2.2 01/10
20
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