- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄362507 > AT88SC220 ASIC PDF資料下載
參數(shù)資料
| 型號： | AT88SC220 |
| 英文描述： | ASIC |
| 中文描述： | 專用集成電路 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 141K |
| 代理商： | AT88SC220 |
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 |
|---|---|
| AT88SC250 | ASIC |
| AT88SC3216C | AT88SC3216C Summary [Updated 4/03. 14 Pages] 32-Kbit User Memory with Authentication and Encryption. This is a summary document. A complete document is available under NDA. For more information. please contact your local sales office. |
| AT88SC3216CRF | AT88SC3216CRF Summary [Updated 5/03. 9 Pages] Contactless 32-Kbit user memory with authentication and encryption. ISO/IEC 14443 Type B compliant. This is a summary document. A complete is available under NDA. For more information. please contact your local Atmel sales office. |
| AT88SC410 | ASIC |
| AT88SC450 | ASIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT88SC250 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC |
| AT88SC25616C | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:CryptoMemory 256 Kbit |
| AT88SC25616C_08 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:CryptoMemory 256 Kbit |
| AT88SC25616C_09 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:CryptoMemory 256 Kbit |
| AT88SC25616C-CI | 功能描述:IC EEPROM 256KBIT 1.5MHZ 8LAP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:CryptoMemory® 標(biāo)準(zhǔn)包裝:96 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:16M（2M x 8，1M x 16） 速度:70ns 接口:并聯(lián) 電源電壓:2.65 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TFSOP（0.724"，18.40mm 寬） 供應(yīng)商設(shè)備封裝:48-TSOP 包裝:托盤 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。