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microwatt/execute2.vhdl

58 lines
1.1 KiB
VHDL

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.common.all;
use work.crhelpers.all;
use work.ppc_fx_insns.all;
-- 2 cycle ALU
-- We handle rc form instructions here
entity execute2 is
port (
clk : in std_ulogic;
e_in : in Execute1ToExecute2Type;
e_out : out Execute2ToWritebackType
);
end execute2;
architecture behave of execute2 is
signal r, rin : Execute2ToWritebackType;
begin
execute2_0: process(clk)
begin
if rising_edge(clk) then
r <= rin;
end if;
end process;
execute2_1: process(all)
variable v : Execute2ToWritebackType;
begin
v := rin;
v.valid := e_in.valid;
v.write_enable := e_in.write_enable;
v.write_reg := e_in.write_reg;
v.write_data := e_in.write_data;
v.write_cr_enable := e_in.write_cr_enable;
v.write_cr_mask := e_in.write_cr_mask;
v.write_cr_data := e_in.write_cr_data;
if e_in.valid = '1' and e_in.rc = '1' then
v.write_cr_enable := '1';
v.write_cr_mask := num_to_fxm(0);
v.write_cr_data := ppc_cmpi('1', e_in.write_data, x"0000") & x"0000000";
end if;
-- Update registers
rin <= v;
-- Update outputs
e_out <= v;
end process;
end;