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參數(shù)資料
| 型號： | AT88SC0808C-MN-XX |
| 元件分類： | EEPROM |
| 英文描述： | EEPROM |
| 中文描述： | EEPROM的 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 141K |
| 代理商： | AT88SC0808C-MN-XX |
7
AT88SC0104C
2021BS–SMEM–10/02
Password Verification
Passwords may be used to protect read and/or write access of any user zone. When a
valid password is presented, it is memorized and active until power is turned off, unless
a new password is presented or RST becomes active. There are eight password sets
that may be used to protect any user zone. Only one password is active at a time, but
write passwords give read access also.
Authentication Protocol
The access to a user zone may be protected by an authentication protocol. Any one of
four keys may be selected to use with a user zone.
The authentication success is memorized and active as long as the chip is powered,
unless a new authentication is initialized or RST becomes active. If the new authentica-
tion request is not validated, the card loses its previous authentication and it should be
presented again. Only the last request is memorized.
Note:
Password and authentication may be presented at any time and in any order. If the trials
limit has been reached (after four consecutive incorrect attempts), the password verifica-
tion or authentication process will not be taken into account.
Figure 4.
Password and Authentication Operations
Checksum
The AT88SC0104C implements a data validity check function in the form of a check-
sum, which may function in standard, authentication or encryption modes.
In the standard mode, the checksum is implemented as a Modification Detection Code
(MDC), in which the host may read a MDC from the device in order to verify that the data
sent was received correctly.
In the authentication and encryption modes, the checksum becomes more powerful
since it provides a bidirectional data integrity check and data origin authentication capa-
bility in the form of a Message Authentication Code (MAC). Only the host/device that
carried out a valid authentication is capable of computing a valid MAC. While operating
in the authentication or encryption modes, the use of a MAC is required. For an ingoing
command, if the device calculates a MAC different from the MAC transmitted by the
host, not only is the command abandoned but the mode is also reset. A new authentica-
tion and/or encryption activation will be required to reactivate the MAC.
CS
VERIFY CS
Write DATA
VERIFY RPW
DATA
Checksum (CS)
VERIFY CS
相關(guān)PDF資料 |
PDF描述 |
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| AT88SC0808C-MN-XX-2.7 | EEPROM |
| AT88SC0808C-MP-XX | EEPROM |
| AT88SC0808C-MP-XX-2.7 | EEPROM |
| AT88SC0808C-PC-XX | EEPROM |
| AT88SC0808C-PC-XX-2.7 | EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT88SC0808C-MN-XX-2.7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EEPROM |
| AT88SC0808C-MP | 功能描述:電可擦除可編程只讀存儲器 CRYPTO Memory 1Kbit, 4zones RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| AT88SC0808C-MPTG | 功能描述:電可擦除可編程只讀存儲器 CRYPTOMEMORY 8-KBIT 8 ZONE RoHS:否 制造商:Atmel 存儲容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| AT88SC0808C-MP-XX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EEPROM |
| AT88SC0808C-MP-XX-2.7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EEPROM |
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