| Line 163... |
Line 163... |
-- Iterative Shifter Unit -----------------------------------------------------------------
|
-- Iterative Shifter Unit -----------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
shifter_unit: process(rstn_i, clk_i)
|
shifter_unit: process(rstn_i, clk_i)
|
begin
|
begin
|
if (rstn_i = '0') then
|
if (rstn_i = '0') then
|
shift_sreg <= (others => '-');
|
shift_sreg <= (others => '0');
|
shift_cnt <= (others => '0');
|
shift_cnt <= (others => '0');
|
shift_cmd_ff <= '0';
|
shift_cmd_ff <= '0';
|
elsif rising_edge(clk_i) then
|
elsif rising_edge(clk_i) then
|
shift_cmd_ff <= shift_cmd;
|
shift_cmd_ff <= shift_cmd;
|
if (shift_start = '1') then -- trigger new shift
|
if (shift_start = '1') then -- trigger new shift
|
| Line 239... |
Line 239... |
when alu_cmd_xor_c => alu_res <= opa xor opb;
|
when alu_cmd_xor_c => alu_res <= opa xor opb;
|
when alu_cmd_or_c => alu_res <= opa or opb;
|
when alu_cmd_or_c => alu_res <= opa or opb;
|
when alu_cmd_and_c => alu_res <= opa and opb;
|
when alu_cmd_and_c => alu_res <= opa and opb;
|
when alu_cmd_shift_c => alu_res <= shift_sreg;
|
when alu_cmd_shift_c => alu_res <= shift_sreg;
|
when alu_cmd_slt_c => alu_res <= (others => '0'); alu_res(0) <= cmp_less;
|
when alu_cmd_slt_c => alu_res <= (others => '0'); alu_res(0) <= cmp_less;
|
when others => alu_res <= (others => '-'); -- undefined
|
when others => alu_res <= (others => '0'); -- undefined
|
end case;
|
end case;
|
end process alu_function_mux;
|
end process alu_function_mux;
|
|
|
|
|
-- ALU Result -----------------------------------------------------------------------------
|
-- ALU Result -----------------------------------------------------------------------------
|
