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參數(shù)資料
| 型號： | x76f400 |
| 英文描述： | Secure SerialFlash(密碼訪問加密串行EEPROM) |
| 中文描述： | 安全SerialFlash（密碼訪問加密串行EEPROM的） |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 78K |
| 代理商： | X76F400 |
X76F400
5
followed by the new command code of 8 bits (1st byte of
the protocol.) If the X76F400 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
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
X76F400 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 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.
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.
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X76F640(中文) | Secure SerialFlash(5種64位密碼保護(hù)；對復(fù)位的同步響應(yīng)；二線串口；允許任意數(shù)目的器件共享同一總線) |
| X7AH-01C | NON-ISOLATED DC/DC CONVERTERS 3 V-3.6 V Input 12 V/0.8 A & 15 V/0.6 A Output |
| X7AH-01FXX0 | NON-ISOLATED DC/DC CONVERTERS 3.0 V-5.5 V Input 12 V/0.8 A & 15 V/0.6 A Output |
| X7AH-01FXXN | NON-ISOLATED DC/DC CONVERTERS 3.0V-5.5V Input -5V/1A & -12V/0.5A Output |
| X7AH-01H1A0 | NON-ISOLATED DC/DC CONVERTER 4.5V-32V Input 1.2V-3.3V/1A Output |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X76F400H | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure SerialFlash |
| X76F400H-2.5 | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure SerialFlash |
| X76F400HI | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure SerialFlash |
| X76F400HI-2.5 | 制造商:ICMIC 制造商全稱:IC MICROSYSTEMS 功能描述:Secure SerialFlash |
| X76F400P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial EEPROM |
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