1. 4-Bit Binary-to-BCD Converter: case Statement
Discussion D3.4
Example 14

2. Binary-to-BCD Converter

3. -- Example 14: 4-Bit Binary-to-BCD Converter
library IEEE;
use IEEE.STD_LOGIC_1164.all;
entity binbcd4 is
port(
b : in STD_LOGIC_VECTOR(3 downto 0);
p : out STD_LOGIC_VECTOR(4 downto 0) );
end binbcd4;

4. architecture binbcd4 of binbcd4 is
signal ps: STD_LOGIC_VECTOR(7 downto 0);
begin
process(b)
case b is
when X"0" => ps <= X"00";
when X"1" => ps <= X"01";
when X"2" => ps <= X"02";
when X"3" => ps <= X"03";
when X"4" => ps <= X"04";
when X"5" => ps <= X"05";
when X"6" => ps <= X"06";
when X"7" => ps <= X"07";
when X"8" => ps <= X"08";
when X"9" => ps <= X"09";
when X"A" => ps <= X"10";
when X"B" => ps <= X"11";
when X"C" => ps <= X"12";
when X"D" => ps <= X"13";
when X"E" => ps <= X"14";
when X"F" => ps <= X"15";
when others => ps <= X"00";
end case;
end process;
p <= ps(4 downto 0);
end binbcd4;

5. Aldec Active-HDL Simulation