jchdl - GSL实例 - ComplementTwo（二的补码）

https://mp.weixin.qq.com/s/Gh2xJJvfg1SlyuayK4LRyQ

 

二的补码指对二进制数的所有位数整体求补。二进制运算下0,1互为补数，n位二进制数a的补数为2^n - a

 

The two's complement of an N-bit number is defined as its complement with respect to 2N. For instance, for the three-bit number 010, the two's complement is 110, because 010 + 110 = 1000.

Conveniently, another way of finding the two's complement of a number is to take its ones' complement and add one: the sum of a number and its ones' complement is all '1' bits, or 2N − 1; and by definition, the sum of a number and its two's complement is 2N.

 

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引自：https://en.wikipedia.org/wiki/Two%27s_complement

 

参考链接

https://github.com/wjcdx/jchdl/blob/master/src/org/jchdl/model/gsl/operator/arithmetic/code/ComplementOne.java

 

 

1.创建Sub.java, 并生成构造方法和logic()方法

略

 

2. 根据逻辑原理图，添加输入输出线

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3. 在构造方法中搜集输入输出线并调用construct()方法

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4. 在logic()方法中创建子节点并连线

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计算方法：2的补码 = 1的补码 + 1.

 

5. 创建inst静态方法方便后续使用

略

 

6. 创建main方法执行验证

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运行结果为：

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即-1的补码表示。

 

 

7. 生成Verilog

生成定制化模块名：

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调用toVerilog()方法生成Verilog实现。

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执行结果如下：

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其余子模块的生成代码略去。