On analysis of the principle and application mode of des, a des module which fits for embedded security system such as IC card is realized by topdown design methods.
在详细分析DES的基本原理和应用模式的基础上，结合DES硬件实现的特点，采用正向设计的方法实现了适用于IC卡等有嵌入式安全需要的系统中的DES模块。
This testing module can also be applied to other kind of dialing IC, and provides references to testing Digital-Analog mixed IC.
这些测试模式可用于其它同类拨号电路的测试，并对数模混合电路的测试提供了参考。
The I/O module was also designed to provide high-level instruction set, which greatly simplified the I/O operation of RF IC cards.
模块设计有用户高级读写指令，极大地简化了应用系统对射频卡的操作；
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