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AS8FLC2M32 Datasheet(PDF) 12 Page - Austin Semiconductor

No. de pieza AS8FLC2M32
Descripción Electrónicos  Hermetic, Multi-Chip Module (MCM) 64Mb, 2M x 32, 3.3Volt Boot Block FLASH Array
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Fabricante Electrónico  AUSTIN [Austin Semiconductor]
Página de inicio  http://www.austinsemiconductor.com
Logo AUSTIN - Austin Semiconductor

AS8FLC2M32 Datasheet(HTML) 12 Page - Austin Semiconductor

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AUSTIN SEMICONDUCTOR, INC.
FLASH
FLASH
FLASH
FLASH
FLASH
AS8FLC2M32
AS8FLC2M32B
Rev. 1.2 5/09
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
12
Austin Semiconductor, Inc.
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.
The system must WRITE the ERASE RESUME command 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.
Erase Operation Diagram
Write ERASE
Command
Sequence
Data Poll from
System
ERASURE
Completed
Start
Data = FFh?
NO
YES
Write Operation Status
The device provides several bits to determine the status of a
write operation: DQ2, DQ3, DQ5, DQ6 and DQ7 of Byte 1;
DQ10, DQ11, DQ13, DQ14 and DQ15 of Byte 2; DQ18, DQ19,
DQ21, DQ22 and DQ23 of Byte 3; as well as, DQ26, DQ27,
DQ29, DQ30 and DQ31 of Byte 4. In addition, the RY/BY\ pin
is also used in the monitoring of this operation.
DQ7, DQ15, DQ23 and DQ31: Data\ Polling
The Data\ Polling bit per byte, indicates to the host system
whether an Embedded Algorithm is in progress or completed,
or whether the device is in ERASE SUSPEND. Data\ Polling is
valid after the rising edge of the final WEx\ pulse in the
PROGRAM or ERASE command sequence.
During the Embedded Program Algorithm, the device outputs
on DQ7 for Byte 1, DQ15 for Byte 2, DQ23 for Byte 3, and DQ31
for Byte 4, the complement of the datum programmed to each
of these bits. This status also applies to the PROGRAMMING
during ERASE SUSPEND. When the Embedded Program
Algorithm is complete, the device outputs the datum
PROGRAMMED into each of these status bits. The system
must provide the PROGRAM address to READ valid status
information. If a PROGRAM address fails within a protected
sector, Data\ Polling is active for approximately 1uS, then the
device returns to reading array data.
During the Embedded Erase Algorithm, Data\ Polling produces
a “0” on the Data\ Polling Status bits. When the Embedded
ERASEAlgorithm is complete, or if the device enters the ERASE
SUSPEND mode, Data\ Polling produces a “1” on each of the
Data\ Polling status bits. This is analogous to the complement/
true data output described for the Embedded Program
Algorithm: the ERASE function changes all the bits in a sector
to “1”; prior to this, the device outputs the “compliment”, or
“0”. The system must provide an address within any of the
sectors selected for ERASURE to READ valid status
information.
After an ERASE Command sequence is WRITTEN, if all s4ctors
selected for erasing are protected, Data\ Polling is active for
approximately 100uS, then the device returns to READING
array data. If not all selected sectors are protected, the
Embedded ERASE Algorithm ERASES the unprotected sectors,
and ignores the selected sectors that are protected.
When the system detects a Data\ Polling status bit has changed
from the complement to true data, it can READ valid data at
each of the Bytes on the following READ cycles. This is
because
Data\ Polling Algorithm Diagram
READ Byte Data
Address = VA
Start
DQ5, DQ13,
DQ21,
DQ29=1?
NO
YES
DQ7, DQ15,
DQ23, DQ31=
Data?
NO
YES
READ Byte Data
Address = VA
DQ7, DQ15,
DQ23, DQ31=
Data?
NO
YES
PASS
FAIL


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