LSI掩模图形的运算在版图分析和校验软件中占有重要的地位，而其中最核心的图形运算是布尔运算和拓扑分析。

The operations for LSI mask artwork play an important role in the mask artwork analysis and verification software. The core in these operations is the boolean operation and topological analysis.

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利用异或运算的性质，给出格雷码公式的推导过程，探讨异或运算在校验码中的应用。

Based on the nature of exclusive or operation, deduce the forming procedure for Grey one and analyze the application of exclusive or operation on the check code.

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紧接着讨论了LDPC译码器中的核心运算单元一校验功能单元的硬件设计。

Then it mainly discusses the hardware design of the key unit in LDPC decoder-check functional unit.

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