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参数资料
| 型号： | YWW7640AE |
| 厂商： | IC MICROSYSTEMS Sdn. Bhd. |
| 英文描述： | Secure SerialFlash |
| 中文描述： | 安全SerialFlash |
| 文件页数： | 10/14页 |
| 文件大小： | 333K |
| 代理商： | YWW7640AE |
X76F400
Characteristics subject to change without notice.
5 of 14
REV 1.0 7/5/00
www.icmic.com
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 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 inserted is correct, the nonvolatile cycle
in response to the password ACK polling
sequence is over, and an “ACK” is returned.
If the password inserted is incorrect, a “no ACK” is
returned, even if the nonvolatile cycle is over. There-
fore, the user cannot be certain that the password is
incorrect until the 10ms write cycle time has elapsed.
Password ACK Polling Sequence
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 auto-
matically 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 Password
ACK Command
Password Load
Completed Enter ACK
Polling
Issue START
NO
YES
PROCEED
相关PDF资料 |
PDF描述 |
|---|---|
| YWW7640AF | Secure SerialFlash |
| YWW7640I | Secure SerialFlash |
| YWW7640 | Secure SerialFlash |
| 0009502242 | 24 CONTACT(S), FEMALE, TWO PART BOARD CONNECTOR, CRIMP |
| 0009503111 | 11 CONTACT(S), FEMALE, TWO PART BOARD CONNECTOR, CRIMP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| YWW7640AF | 制造商:ICMIC 制造商全称:IC MICROSYSTEMS 功能描述:Secure SerialFlash |
| YWW7640I | 制造商:ICMIC 制造商全称:IC MICROSYSTEMS 功能描述:Secure SerialFlash |
| YWXC1020U02 | 制造商:Panasonic Industrial Company 功能描述:COIL PANASONIC |
| YWYS30467 | 制造商:Panasonic Industrial Company 功能描述:FILTER |
| YWYS34468T | 制造商:Panasonic Industrial Company 功能描述:COIL |
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