On off register to activate each load...

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manush30

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Hi friends,

I try to write a code but i sure there is more simple way to do it..

I have 8 components on my board that i can do them on/off switching.
I get 8bit register(each bit for each load) and choose wht of the load will activate.
I thought to do it with "case" statement but i will have a lots of states...

Can anyone advise for a better way to implement it..
 

I try to write a code but i sure there is more simple way to do it..
Click to expand...
Show us what you have done first.

I think a series of "if -else" would suffice.
 

Thx a lot.
See below the code..

Code VHDL - [expand]
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Begin
process(mclk, reset)
begin
    if all_rst='1' then
        load_reg <= x"1ff";
    elsif rising_edge(mclk) then
        case load_reg is
                    when x"000"  => load0 <= '0'; load1 <= '0'; load2 <= '0'; load3 <= '0'; load4 <= '0'; load5 <= '0'; load6 <= '0'; load7 <= '0';
                    when x"001"  => load0 <= '1'; load1 <= '0'; load2 <= '0'; load3 <= '0'; load4 <= '0'; load5 <= '0'; load6 <= '0'; load7 <= '0';
                    when x"002"  => load0 <= '0'; load1 <= '1'; load2 <= '0'; load3 <= '0'; load4 <= '0'; load5 <= '0'; load6 <= '0'; load7 <= '0';
                    when x"003"  => load0 <= '0'; load1 <= '1'; load2 <= '1'; load3 <= '0'; load4 <= '0'; load5 <= '0'; load6 <= '0'; load7 <= '0';
                    when x"004"  => load0 <= '0'; load1 <= '0'; load2 <= '0'; load3 <= '1'; load4 <= '0'; load5 <= '0'; load6 <= '0'; load7 <= '0';
                    etc....
        End case;
        end if;
end process;
 
Last edited by a moderator:

Instead of having the load* as separate bits, have it as an 8 bits output port.

Code: 
signal load0     : std_logic_vector(7 downto 0) :=(others => '0');
signal load_reg : std_logic_vector(3 downto 0) := x"4"; 
.
.
begin
    process(mclk, all_rst)
    begin
        if all_rst='1' then
            load0    <= x"ff";
       
        elsif rising_edge(mclk) then
            case load_reg is        
                    when x"0"  => load0 <= x"00";
                    when x"1"  => load0 <= "00000001";
                    when x"2"  => load0 <= "00000010";
                    when x"3"  => load0 <= "00000100";
                    when x"4"  => load0 <= "00001000";
                    etc....
                    when x"7"  => load0 <= "10000000";
                    when others => load0 <= x"ff"; -- reset value
            end case;
        end if;
    end process;
    
    load_out_o <= load0;

Yes, it is almost similar yours, only the representation is smarter is guess.
Even if "if...else" was used, the matching conditions needed to be mentioned explicitly.
 
Last edited:

even better, why not just

load <= load_reg?

As thats what your code appears to imply you want to do, you turn LEDs on based on the bits from the register?
If you need some other encoding scheme, then a case statement is probably the easiest. (but put the load output into a single bus)

- - - Updated - - -

even better, why not just

load <= load_reg?

As thats what your code appears to imply you want to do, you turn LEDs on based on the bits from the register?
If you need some other encoding scheme, then a case statement is probably the easiest. (but put the load output into a single bus)
 
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