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https://opencores.org/ocsvn/mips_fault_tolerant/mips_fault_tolerant/trunk
Subversion Repositories mips_fault_tolerant
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Rev 27 → Rev 28
/trunk/source/NPC_mux.vhd
0,0 → 1,78
---------------------------------------------------------------------------------- |
-- Company: |
-- Engineer: |
-- |
-- Create Date: 19:46:29 06/24/2012 |
-- Design Name: |
-- Module Name: NPC_mux - Behavioral |
-- Project Name: |
-- Target Devices: |
-- Tool versions: |
-- Description: |
-- |
-- Dependencies: |
-- |
-- Revision: |
-- Revision 0.01 - File Created |
-- Additional Comments: |
-- |
---------------------------------------------------------------------------------- |
library IEEE; |
use IEEE.STD_LOGIC_1164.ALL; |
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-- Uncomment the following library declaration if using |
-- arithmetic functions with Signed or Unsigned values |
--use IEEE.NUMERIC_STD.ALL; |
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-- Uncomment the following library declaration if instantiating |
-- any Xilinx primitives in this code. |
--library UNISIM; |
--use UNISIM.VComponents.all; |
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entity NPC_mux is |
port ( |
clk : in std_logic; |
Zero_in,EqNq : in std_logic; |
From_N: in std_logic_vector(31 downto 0); |
From_A: in std_logic_vector(31 downto 0); |
From_M: in std_logic_vector(31 downto 0); |
PCSource: in std_logic_vector(1 downto 0); |
NPC_out: out std_logic_vector(31 downto 0) |
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); |
end NPC_mux; |
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architecture Behavioral of NPC_mux is |
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begin |
process(clk,PCSource,From_N,From_A,From_M,Zero_in) |
begin |
if (FALLING_EDGE(clk))then |
case PCSource is |
when "00" => NPC_out <= From_N; |
when "01" => |
case EqNq is |
when '0' => |
if Zero_in = '1' then |
NPC_out <= From_M; |
else |
NPC_out <= From_N; |
end if; |
when '1' => |
if Zero_in = '0' then |
NPC_out <= From_M; |
else |
NPC_out <= From_N; |
end if; |
when others => NPC_out <= (others => '0'); |
end case; |
when "10" => NPC_out <= From_A; |
when others => NPC_out <= (others => '0'); |
end case; |
end if; |
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end process; |
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end Behavioral; |
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