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參數資料
| 型號： | X76F641HE |
| 英文描述： | Secure SerialFlash |
| 中文描述： | 安全SerialFlash |
| 文件頁數： | 6/17頁 |
| 文件大小： | 116K |
| 代理商： | X76F641HE |
X76F641
6
ACK Polling
Once a stop condition is issued to indicate the end of the
host’s write sequence, the X76F641 initiates the internal
nonvolatile write cycle. In order to take advantage of the
typical 5ms write cycle, ACK polling can begin
immediately. This involves issuing the start condition
followed by the new command code of 8 bits (1st byte of
the protocol.) If the X76F641 is still busy with the
nonvolatile write operation, it will issue a “no-ACK” 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.
Data ACK Polling Sequence
After the password sequence, there is always a nonvola-
tile 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 X76F641
requires the master to perform an ACK polling with the
specific code of F0h. 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 is over,
in response to the ACK polling cycle immediately follow-
ing it.
If the password that was inserted was incorrect, then a
“no ACK” 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.
ACK
RETURNED
ISSUE NEW
COMMAND
CODE
WRITE SEQUENCE
COMPLETED
ENTER ACK POLLING
ISSUE START
NO
YES
PROCEED
7025 FM 08
Password ACK Polling Sequence
ACK
RETURNED
ISSUE
PASSWORD
ACK COMMAND
PASSWORD LOAD
COMPLETED
ENTER ACK POLLING
ISSUE START
NO
YES
PROCEED
7025 FM 09
相關PDF資料 |
PDF描述 |
|---|---|
| X76F641XE | Secure SerialFlash |
| X7R | (144.39 k) |
| X84041SI2.7 | Serial EEPROM |
| X84041VI2.7 | Serial EEPROM |
| X84041VI | Micro Port Saver E2PROM |
相關代理商/技術參數 |
參數描述 |
|---|---|
| X76F641HE-2.0 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:Secure SerialFlash |
| X76F641HEG | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure Serial Flash |
| X76F641HEG-2.0 | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure Serial Flash |
| X76F641HG | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure Serial Flash |
| X76F641HG-2.0 | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure Serial Flash |
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