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https://opencores.org/ocsvn/neorv32/neorv32/trunk
[/] [neorv32/] [trunk/] [rtl/] [core/] [neorv32_cpu_alu.vhd] - Diff between revs 49 and 55
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| Rev 49 |
Rev 55 |
| Line 100... |
Line 100... |
cmd : std_ulogic;
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cmd : std_ulogic;
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cmd_ff : std_ulogic;
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cmd_ff : std_ulogic;
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busy : std_ulogic;
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busy : std_ulogic;
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start : std_ulogic;
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start : std_ulogic;
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halt : std_ulogic;
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halt : std_ulogic;
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timeout : std_ulogic_vector(9 downto 0);
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end record;
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end record;
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signal cp_ctrl : cp_ctrl_t;
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signal cp_ctrl : cp_ctrl_t;
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begin
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begin
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| Line 275... |
Line 276... |
cp_arbiter: process(rstn_i, clk_i)
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cp_arbiter: process(rstn_i, clk_i)
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begin
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begin
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if (rstn_i = '0') then
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if (rstn_i = '0') then
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cp_ctrl.cmd_ff <= '0';
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cp_ctrl.cmd_ff <= '0';
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cp_ctrl.busy <= '0';
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cp_ctrl.busy <= '0';
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cp_ctrl.timeout <= (others => '0');
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elsif rising_edge(clk_i) then
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elsif rising_edge(clk_i) then
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cp_ctrl.cmd_ff <= cp_ctrl.cmd;
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cp_ctrl.cmd_ff <= cp_ctrl.cmd;
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if (or_all_f(cp_valid_i) = '1') then -- cp computation done?
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if (or_all_f(cp_valid_i) = '1') then -- cp computation done?
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cp_ctrl.busy <= '0';
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cp_ctrl.busy <= '0';
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elsif (cp_ctrl.timeout(cp_ctrl.timeout'left) = '1') and (cp_timeout_en_c = true) then -- timeout
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assert false report "NEORV32 CPU CO-PROCESSOR TIMEOUT ERROR!" severity warning;
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cp_ctrl.busy <= '0';
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elsif (cp_ctrl.start = '1') then
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elsif (cp_ctrl.start = '1') then
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cp_ctrl.busy <= '1';
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cp_ctrl.busy <= '1';
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end if;
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end if;
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-- timeout counter --
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if (cp_ctrl.busy = '1') and (cp_timeout_en_c = true) then
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cp_ctrl.timeout <= std_ulogic_vector(unsigned(cp_ctrl.timeout) + 1);
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else
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cp_ctrl.timeout <= (others => '0');
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end if;
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end if;
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end if;
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end process cp_arbiter;
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end process cp_arbiter;
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-- is co-processor operation? --
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-- is co-processor operation? --
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cp_ctrl.cmd <= '1' when (ctrl_i(ctrl_alu_func1_c downto ctrl_alu_func0_c) = alu_func_cmd_copro_c) else '0';
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cp_ctrl.cmd <= '1' when (ctrl_i(ctrl_alu_func1_c downto ctrl_alu_func0_c) = alu_func_cmd_copro_c) else '0';
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