并从网路实用性出发，选择了8b1h和5b6b两种线路码，分别构成两种不同的系统。

Based on the practicability of networks, two types of line code, 8b1h and 5b6b, are chosen, which are applied to two different systems.

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线路码；频谱变换；位定时提取。

FPGA; line code; spectrum transform; bit timing pick-up.

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本文利用布尔差分的性质，给出了一种不同于传统的求组合逻辑线路故障测试码的新方法，对故障测试有一定的简化作用。

The properties of Boolean difference are made use of to derive a new method for fault testing in combinational logic circuits. This method is simpler and different from the traditional one.

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