How to become a senior digital IC Design Engineer (1-5) Verilog coding syntax: operand

One 、 Define operand

1、 If you operate directly in a complete way reg or net or variable or parameter, Is to write their names directly , All its bits are treated as operands .

2、 If you operate one bit 1-Bit , namely Bit-Select   Operands , Here the array elements Bit-Select or Part-Select It can be used as an operation number for standby operation .

3、 If you operate on multiple bits N-Bits, namely Part-Select Operands , Here the array elements Bit-Select or Part-Select It can be used as an operation number for standby operation .

4、 Data generated by the join operator （ Including nested join operators ）or Functions and so on can be used as operands for operation .

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Two 、Bit-Select

1、 Bit index extraction 1-Bit Specified data .

2、 A bit index can be an expression .

3、 Normal reading and writing within the range of bit index , Everything outside the scope Read X Write None.

4、 about scalar、real variable、realtime variable operation Bit-Select It's all illegal .

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3、 ... and 、Part-Select

1、Part-Select extract N-Bits Specified data （N > 1）.