| Line 176... |
Line 176... |
shifter.sreg <= rs1_i; -- shift operand (can only be rs1; opa would also contain pc)
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shifter.sreg <= rs1_i; -- shift operand (can only be rs1; opa would also contain pc)
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shifter.cnt <= opb(index_size_f(data_width_c)-1 downto 0); -- shift amount
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shifter.cnt <= opb(index_size_f(data_width_c)-1 downto 0); -- shift amount
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elsif (shifter.run = '1') then -- running shift
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elsif (shifter.run = '1') then -- running shift
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-- coarse shift: multiples of 4 --
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-- coarse shift: multiples of 4 --
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if (TINY_SHIFT_EN = false) and -- use coarse shifts first if TINY SHIFT option is NOT enabled
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if (TINY_SHIFT_EN = false) and -- use coarse shifts first if TINY SHIFT option is NOT enabled
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(or_all_f(shifter.cnt(shifter.cnt'left downto 2)) = '1') then -- shift amount >= 4
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(or_reduce_f(shifter.cnt(shifter.cnt'left downto 2)) = '1') then -- shift amount >= 4
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shifter.cnt <= std_ulogic_vector(unsigned(shifter.cnt) - 4);
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shifter.cnt <= std_ulogic_vector(unsigned(shifter.cnt) - 4);
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if (ctrl_i(ctrl_alu_shift_dir_c) = '0') then -- SLL: shift left logical
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if (ctrl_i(ctrl_alu_shift_dir_c) = '0') then -- SLL: shift left logical
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shifter.sreg <= shifter.sreg(shifter.sreg'left-4 downto 0) & "0000";
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shifter.sreg <= shifter.sreg(shifter.sreg'left-4 downto 0) & "0000";
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else -- SRL: shift right logical / SRA: shift right arithmetical
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else -- SRL: shift right logical / SRA: shift right arithmetical
|
shifter.sreg <= (shifter.sreg(shifter.sreg'left) and ctrl_i(ctrl_alu_shift_ar_c)) &
|
shifter.sreg <= (shifter.sreg(shifter.sreg'left) and ctrl_i(ctrl_alu_shift_ar_c)) &
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| Line 264... |
Line 264... |
-- is shift operation? --
|
-- is shift operation? --
|
shifter.cmd <= '1' when (ctrl_i(ctrl_alu_func1_c downto ctrl_alu_func0_c) = alu_func_cmd_shift_c) else '0';
|
shifter.cmd <= '1' when (ctrl_i(ctrl_alu_func1_c downto ctrl_alu_func0_c) = alu_func_cmd_shift_c) else '0';
|
shifter.start <= '1' when (shifter.cmd = '1') and (shifter.cmd_ff = '0') else '0';
|
shifter.start <= '1' when (shifter.cmd = '1') and (shifter.cmd_ff = '0') else '0';
|
|
|
-- shift operation running? --
|
-- shift operation running? --
|
shifter.run <= '1' when (or_all_f(shifter.cnt) = '1') or (shifter.start = '1') else '0';
|
shifter.run <= '1' when (or_reduce_f(shifter.cnt) = '1') or (shifter.start = '1') else '0';
|
shifter.halt <= '1' when (or_all_f(shifter.cnt(shifter.cnt'left downto 1)) = '1') or (shifter.start = '1') else '0';
|
shifter.halt <= '1' when (or_reduce_f(shifter.cnt(shifter.cnt'left downto 1)) = '1') or (shifter.start = '1') else '0';
|
|
|
|
|
-- Co-Processor Arbiter -------------------------------------------------------------------
|
-- Co-Processor Arbiter -------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- Interface:
|
-- Interface:
|
| Line 281... |
Line 281... |
cp_ctrl.cmd_ff <= '0';
|
cp_ctrl.cmd_ff <= '0';
|
cp_ctrl.busy <= '0';
|
cp_ctrl.busy <= '0';
|
cp_ctrl.timeout <= (others => '0');
|
cp_ctrl.timeout <= (others => '0');
|
elsif rising_edge(clk_i) then
|
elsif rising_edge(clk_i) then
|
cp_ctrl.cmd_ff <= cp_ctrl.cmd;
|
cp_ctrl.cmd_ff <= cp_ctrl.cmd;
|
if (or_all_f(cp_valid_i) = '1') then -- cp computation done?
|
if (or_reduce_f(cp_valid_i) = '1') then -- cp computation done?
|
cp_ctrl.busy <= '0';
|
cp_ctrl.busy <= '0';
|
elsif (cp_ctrl.timeout(cp_ctrl.timeout'left) = '1') and (cp_timeout_en_c = true) then -- timeout
|
elsif (cp_ctrl.timeout(cp_ctrl.timeout'left) = '1') and (cp_timeout_en_c = true) then -- timeout
|
assert false report "NEORV32 CPU CO-PROCESSOR TIMEOUT ERROR!" severity warning;
|
assert false report "NEORV32 CPU CO-PROCESSOR TIMEOUT ERROR!" severity warning;
|
cp_ctrl.busy <= '0';
|
cp_ctrl.busy <= '0';
|
elsif (cp_ctrl.start = '1') then
|
elsif (cp_ctrl.start = '1') then
|
| Line 315... |
Line 315... |
end if;
|
end if;
|
end loop; -- i
|
end loop; -- i
|
end process;
|
end process;
|
|
|
-- co-processor operation (still) running? --
|
-- co-processor operation (still) running? --
|
cp_ctrl.halt <= (cp_ctrl.busy and (not or_all_f(cp_valid_i))) or cp_ctrl.start;
|
cp_ctrl.halt <= (cp_ctrl.busy and (not or_reduce_f(cp_valid_i))) or cp_ctrl.start;
|
|
|
-- co-processor result - only the *actually selected* co-processor may output data != 0 --
|
-- co-processor result - only the *actually selected* co-processor may output data != 0 --
|
cp_res <= cp_result_i(0) or cp_result_i(1) or cp_result_i(2) or cp_result_i(3) or
|
cp_res <= cp_result_i(0) or cp_result_i(1) or cp_result_i(2) or cp_result_i(3) or
|
cp_result_i(4) or cp_result_i(5) or cp_result_i(6) or cp_result_i(7);
|
cp_result_i(4) or cp_result_i(5) or cp_result_i(6) or cp_result_i(7);
|
|
|
