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X76F200V8I-2.0 Datasheet(PDF) 5 Page - IC MICROSYSTEMS

Part # X76F200V8I-2.0
Description  Secure Serial Flash
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Manufacturer  ICMIC [IC MICROSYSTEMS]
Direct Link  http://www.icmic.com
Logo ICMIC - IC MICROSYSTEMS

X76F200V8I-2.0 Datasheet(HTML) 5 Page - IC MICROSYSTEMS

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X76F200
5
followed by the new command code of 8 bits (1st byte of the
protocol.) If the X76F200 is still busy with the
nonvolatile write operation, it will issue a “no-A
CK” in response. If the nonvolatile write operation has
completed, an “ACK” will be returned and the host can
then proceed with the rest of the protocol.
After the password sequence, there is always a
nonvolatile write cycle. This is done to discourage
random guesses of the password if the device is being
tampered with. In order to continue the transaction, the
X76F200 requires the master to perform a password ACK
polling sequence with the specific command code
of 55h. As with regular Acknowledge polling the user can
either time out for 10ms, and then issue the ACK polling
once, or continuously loop as described in the flow.
If the password that was inserted was correct, then an
“ACK” will be returned once the nonvolatile cycle in
response to the passwrod ACK polling sequence is over.
If the password that was inserted was incorrect, then a “no
A
CK” will be returned even if the nonvolatile cycle is over.
Therefore, the user cannot be certain that the pass- word is
incorrect until the 10ms write cycle time has
elapsed.
READ OPERATIONS
Read operations are initiated in the same manner as
write operations but with a different command code.
Sector Read
With sector read, a sector address is supplied with the read
command. Once the password has been
acknowledged data may be read from the sector. An
acknowledge must follow each 8-bit data transfer. A read
operation always begins at the first byte in the sector, but may
stop at any time. Random accesses to the array are
not possible. Continuous reading from the array will return
data from successive sectors. After reading the
last sector in the array, the address is automatically set to
the first sector in the array and data can continue to be
read out. After the last bit has been read, a stop condition is
generated without sending a preceding acknowledge.
Data ACK Polling Sequence
ACK
RETURNED
?
ISSUE NEW
COMMAND
CODE
WRITE SEQUENCE
COMPLETED
ENTER ACK POLLING
ISSUE START
NO
YES
PROCEED
Password ACK Polling Sequence
ACK
RETURNED
?
ISSUE
PASSWORD
ACK COMMAND
PASSWORD LOAD
COMPLETED
ENTER ACK POLLING
ISSUE START
NO
YES
PROCEED


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