HY29DL162 Datasheet, PDF (20/48 Pages) Hynix Semiconductor – 16 Megabit (2M x 8/1M x16) Low Voltage, Dual Bank, Simultaneous Read/Write Flash Memory

HY29DL162/HY29DL163
the additional sector erase commands are being
issued and then be re-enabled afterwards.
The system can monitor DQ[3] to determine if the
50 µs sector erase time-out has expired, as de-
scribed in the Write Operation Status section. If
the time between additional sector erase com-
mands can be assured to be less than the time-
out, the system need not monitor DQ[3].
Any command other than Sector Erase or Erase
Suspend during the time-out period resets the
bank(s) to reading array data. The system must
then rewrite the command sequence, including any
additional sector addresses. Once the sector
erase operation itself has begun, only the Erase
Suspend command is valid. All other commands
are ignored.
As for the Chip Erase command, note that a hard-
ware reset immediately terminates the erase op-
eration. To ensure data integrity, the aborted Sec-
tor Erase command sequence should be reissued
once the reset operation is complete.
If all sectors designated for erasing are protected,
the device returns to reading array data after ap-
proximately 100 µs. If at least one designated
sector is unprotected, the erase operation erases
the unprotected sectors, and ignores the command
for the sectors that are protected. If sectors in a
bank are designated for erasure, read array op-
erations from that bank cannot take place until the
Automatic Erase algorithm terminates, even if all
of those sectors are protected. However, the
HY29DL16x’s simultaneous read feature allows
data to be read from a bank that does not contain
any sectors that are designated for erasure while
the erase algorithm is in progress in the other bank.
When the Automatic Erase algorithm is complete,
the device returns the erased sector(s) to the Read
array data mode. Several methods are provided
to allow the host to determine the status of the
erase operation, as described in the Write Opera-
tion Status section.
Figure 6 illustrates the sector erase procedure.
Erase Suspend/Erase Resume Commands
The Erase Suspend command allows the system
to interrupt a sector erase operation to program
data into, or to read data from, any sector not
designated for erasure. (The HY29DL16x’s simul-
taneous read feature allows data to be read from
a bank that does not contain any sectors marked
for erasure even while the erase operation is not
suspended). The command, which requires the
START
Write First Five Cycles of
SECTOR ERASE
Command Sequence
Setup First (or Next) Sector
Address for Erase Operation
Check Erase Status
(See Write Operation Status
Section)
DQ[5] Error Exit
Normal Exit
ERASE COMPLETE
GO TO
ERROR RECOVERY
Write Last Cycle (SA/0x30)
of SECTOR ERASE
Command Sequence
Erase An
YES
Additional Sector?
NO
Sector Erase
Time-out (DQ[3])
Expired?
YES
NO
Sectors which require erasure
but which were not specified in
this erase cycle must be erased
later using a new command
sequence
Figure 6. Sector Erase Procedure
20
r1.3/June 01