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S71AL016D 데이터시트(HTML) 31 Page - SPANSION

부품명 S71AL016D
상세내용  Stacked Multi-Chip Product (MCP) Flash Memory and RAM
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S71AL016D 데이터시트(HTML) 31 Page - SPANSION

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August 4, 2004 S29AL016D_00_A1_E
S29AL016D
31
Ad vance
Info rmat i o n
Erase Suspend/Erase Resume Commands
The Erase Suspend command allows the system to interrupt a sector erase oper-
ation 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 Em-
bedded 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 sec-
tors 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” 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” 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 Com-
mand 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.


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