how to incorporate 2 cycles of latency

Altera_Forum · ‎11-17-2016

hello fellow vhdl coders

I have been away from VHDL for over 2 years and I have a question which I am struggling to complete. does anyone know how to incorporate 2 cycles of latency into my vhdl module were i have muxes between 11 buses and an 8 bit output here is the code i have so far.

library IEEE;

use IEEE.STD_LOGIC_1164.all;

entity mux is

port(

clk: in std_logic;

A: in STD_LOGIC_vector(7 downto 0);

B: in STD_LOGIC_vector(7 downto 0);

C: in STD_LOGIC_vector(7 downto 0);

D: in STD_LOGIC_vector(7 downto 0);

E: in STD_LOGIC_vector(7 downto 0);

F: in STD_LOGIC_vector(7 downto 0);

G: in STD_LOGIC_vector(7 downto 0);

H: in STD_LOGIC_vector(7 downto 0);

I: in STD_LOGIC_vector(7 downto 0);

J: in STD_LOGIC_vector(7 downto 0);

K: in STD_LOGIC_vector(7 downto 0);

S0: in std_LOGIC_vector(3 downto 0);

Z: out STD_LOGIC_vector(7 downto 0)

);

end mux;

architecture func of mux is

begin

p: process(clk,A,B,C,D,E,F,G,H,I,J,K,S0)

begin

if(rising_edge(clk)) then

case s0 is

when "0001" => Z <= A;

when "0010" => Z <= B;

when "0011" => Z <= C;

when "0100" => Z <= D;

when "0101" => Z <= E;

when "0110" => Z <= F;

when "0111" => Z <= G;

when "1000" => Z <= H;

when "1001" => Z <= I;

when "1010" => Z <= J;

when "1011" => Z <= K;

when others => Z <=A;

end case;

end if;

end process;

end func;

I have tried to look through my notes when I took this class in university but i just understand how to do cycles of latency is there anyone who can help me out?

Altera_Forum · ‎11-17-2016

inside that process or in another clocked process write:

--z to be signal, not output

z_1d <= z;

z_2d <= z_1d; -- this should be output