Vhdl 如何检查像素标准逻辑向量的偶数和奇数

我想知道“我有2个值，它是

std\u logic\u vector

，我想检查它的最后一位是否为奇数和偶数，我想让它们都计算像素值的准确位置。这可以通过case语句实现”

---

我只想检查LSB。

使用case检查两个LSB是：

  process(x_cont, y_cont)
    type res_t is (both_low, one_low, none_low);
    variable result: res_t;
    variable lsbs: std_logic_vector(1 downto 0);
  begin
    lsbs:=x_cont(0) & y_cont(0);
    case (lsbs) is
    when "00" =>
        result:=both_low;
    when "01" | "10" =>
        result:=one_low;
    when others =>      
        result:=none_low;
    end case;

end process;

---

检查lsb很容易：如果x_cont（0）=“1”，则

  process(x_cont, y_cont)
    type res_t is (both_low, one_low, none_low);
    variable result: res_t;
    variable lsbs: std_logic_vector(1 downto 0);
  begin
    lsbs:=x_cont(0) & y_cont(0);
    case (lsbs) is
    when "00" =>
        result:=both_low;
    when "01" | "10" =>
        result:=one_low;
    when others =>      
        result:=none_low;
    end case;

end process;