instreg.vhd

来自「It is the code for implementing the proj」· VHDL 代码 · 共 36 行

LIBRARY IEEE;
USE IEEE.std_logic_1164.ALL;
USE IEEE.numeric_std.ALL;
-- use package
USE work.procmem_definitions.ALL;
ENTITY instreg IS
PORT (
clk : IN STD_ULOGIC;
rst_n : IN STD_ULOGIC;
memdata : IN STD_ULOGIC_VECTOR(width-1 DOWNTO 0);
IRWrite : IN STD_ULOGIC;
instr_31_26 : OUT STD_ULOGIC_VECTOR(5 DOWNTO 0);
instr_25_21 : OUT STD_ULOGIC_VECTOR(4 DOWNTO 0);
instr_20_16 : OUT STD_ULOGIC_VECTOR(4 DOWNTO 0);
instr_15_0 : OUT STD_ULOGIC_VECTOR(15 DOWNTO 0) );
END instreg;
ARCHITECTURE behave OF instreg IS
BEGIN
proc_instreg : PROCESS(clk, rst_n)
BEGIN
IF rst_n = '0' THEN
instr_31_26 <= (OTHERS => '0');
instr_25_21 <= (OTHERS => '0');
instr_20_16 <= (OTHERS => '0');
instr_15_0 <= (OTHERS => '0');
ELSIF RISING_EDGE(clk) THEN
-- write the output of the memory into the instruction register
IF(IRWrite = '1') THEN
instr_31_26 <= memdata(31 DOWNTO 26);
instr_25_21 <= memdata(25 DOWNTO 21);
instr_20_16 <= memdata(20 DOWNTO 16);
instr_15_0 <= memdata(15 DOWNTO 0);
END IF;
END IF;
END PROCESS;
END behave;