WITH - SELECT 具有多个条件的语句 (VHDL)

Question

select VHDL 中在不止一种情况下分配相同信号的语句：
with ALUop select z <= s_add_sub when "00000", s_add_sub when "00001", s_add_sub when "00010", s_add_sub when "00011", x AND y when "00100", x OR y when "00101", x XOR y when "00110", lhi when "00111", seq when "01000", sne when "01001", slt when "01010", sgt when "01011", sle when "01100", sge when "01101", NOT x when "01110", x when "01111", shift_out when "10000", shift_out when "10001", shift_out when "10010", y when "10011", x"00000000" when others;
我如何更改语句以便在多个条件下仅在一行中进行分配，例如：

with ALUop select z <= s_add_sub when "00000" OR "00001" OR "00010" OR "00011",...

Answer 1

使用 | 而不是 OR 进行多项选择，因此代码如下：

with ALUop select 
  z <= s_add_sub when "00000" | "00001" | "00010" | "00011", 
       x AND y when "00100", 
       ...

这类似于 case 的多项选择的语法。

WITH - SELECT 具有多个条件的语句 (VHDL)

WITH - SELECT statement with multiple conditions (VHDL)

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