| Line 92... |
Line 92... |
-- co-processor arbiter and interface --
|
-- co-processor arbiter and interface --
|
type cp_ctrl_t is record
|
type cp_ctrl_t is record
|
cmd : std_ulogic;
|
cmd : std_ulogic;
|
cmd_ff : std_ulogic;
|
cmd_ff : std_ulogic;
|
start : std_ulogic;
|
start : std_ulogic;
|
busy : std_ulogic;
|
|
timeout : std_ulogic_vector(9 downto 0);
|
|
end record;
|
end record;
|
signal cp_ctrl : cp_ctrl_t;
|
signal cp_ctrl : cp_ctrl_t;
|
|
|
-- co-processor interface --
|
-- co-processor interface --
|
signal cp_start : std_ulogic_vector(3 downto 0); -- trigger co-processor i
|
type cp_data_if_t is array (0 to 7) of std_ulogic_vector(data_width_c-1 downto 0);
|
signal cp_valid : std_ulogic_vector(3 downto 0); -- co-processor i done
|
|
signal cp_result : cp_data_if_t; -- co-processor result
|
signal cp_result : cp_data_if_t; -- co-processor result
|
|
signal cp_start : std_ulogic_vector(7 downto 0); -- trigger co-processor i
|
|
signal cp_valid : std_ulogic_vector(7 downto 0); -- co-processor i done
|
|
|
begin
|
begin
|
|
|
-- Comparator Unit (for conditional branches) ---------------------------------------------
|
-- Comparator Unit (for conditional branches) ---------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
| Line 180... |
Line 179... |
end case;
|
end case;
|
end process alu_function_mux;
|
end process alu_function_mux;
|
|
|
|
|
-- **************************************************************************************************************************
|
-- **************************************************************************************************************************
|
-- Co-Processors
|
-- CPU Co-Processors
|
-- **************************************************************************************************************************
|
-- **************************************************************************************************************************
|
|
|
-- Co-Processor Arbiter -------------------------------------------------------------------
|
-- Co-Processor Interface --
|
-- -------------------------------------------------------------------------------------------
|
|
-- Interface:
|
|
-- Co-processor "valid" signal has to be asserted (for one cycle) one cycle before asserting output data
|
-- Co-processor "valid" signal has to be asserted (for one cycle) one cycle before asserting output data
|
-- Co-processor "output data" has to be always zero unless co-processor was explicitly triggered
|
-- Co-processor "output data" has to be always zero unless co-processor was explicitly triggered
|
|
|
|
-- Co-Processor Arbiter -------------------------------------------------------------------
|
|
-- -------------------------------------------------------------------------------------------
|
cp_arbiter: process(rstn_i, clk_i)
|
cp_arbiter: process(rstn_i, clk_i)
|
begin
|
begin
|
if (rstn_i = '0') then
|
if (rstn_i = '0') then
|
cp_ctrl.cmd_ff <= '0';
|
cp_ctrl.cmd_ff <= '0';
|
cp_ctrl.busy <= '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;
|
-- timeout counter --
|
|
if (cp_ctrl.start = '1') then
|
|
cp_ctrl.busy <= '1';
|
|
elsif (or_reduce_f(cp_valid) = '1') then
|
|
cp_ctrl.busy <= '0';
|
|
end if;
|
|
if (cp_ctrl.busy = '1') and (cp_timeout_en_c = true) then
|
|
cp_ctrl.timeout <= std_ulogic_vector(unsigned(cp_ctrl.timeout) + 1);
|
|
else
|
|
cp_ctrl.timeout <= (others => '0');
|
|
end if;
|
|
if (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;
|
|
end if;
|
|
end if;
|
end if;
|
end process cp_arbiter;
|
end process cp_arbiter;
|
|
|
-- is co-processor operation? --
|
-- is co-processor operation? --
|
cp_ctrl.cmd <= '1' when (ctrl_i(ctrl_alu_func1_c downto ctrl_alu_func0_c) = alu_func_copro_c) else '0';
|
cp_ctrl.cmd <= '1' when (ctrl_i(ctrl_alu_func1_c downto ctrl_alu_func0_c) = alu_func_copro_c) else '0';
|
cp_ctrl.start <= '1' when (cp_ctrl.cmd = '1') and (cp_ctrl.cmd_ff = '0') else '0';
|
cp_ctrl.start <= '1' when (cp_ctrl.cmd = '1') and (cp_ctrl.cmd_ff = '0') else '0';
|
|
|
-- co-processor select / star trigger --
|
-- co-processor select / start trigger --
|
cp_start(0) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "00") else '0';
|
cp_start(0) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "000") else '0';
|
cp_start(1) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "01") else '0';
|
cp_start(1) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "001") else '0';
|
cp_start(2) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "10") else '0';
|
cp_start(2) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "010") else '0';
|
cp_start(3) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "11") else '0';
|
cp_start(3) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "011") else '0';
|
|
cp_start(4) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "100") else '0';
|
|
cp_start(5) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "101") else '0';
|
|
cp_start(6) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "110") else '0';
|
|
cp_start(7) <= '1' when (cp_ctrl.start = '1') and (ctrl_i(ctrl_cp_id_msb_c downto ctrl_cp_id_lsb_c) = "111") else '0';
|
|
|
-- co-processor operation done? --
|
-- co-processor operation done? --
|
idone_o <= or_reduce_f(cp_valid);
|
idone_o <= or_reduce_f(cp_valid);
|
|
|
-- 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(0) or cp_result(1) or cp_result(2) or cp_result(3);
|
cp_res <= cp_result(0) or cp_result(1) or cp_result(2) or cp_result(3) or cp_result(4) or cp_result(5) or cp_result(6) or cp_result(7);
|
|
|
|
|
-- Co-Processor 0: Shifter (CPU Core ISA) --------------------------------------------------
|
-- Co-Processor 0: Shifter (CPU Core ISA) --------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
neorv32_cpu_cp_shifter_inst: neorv32_cpu_cp_shifter
|
neorv32_cpu_cp_shifter_inst: neorv32_cpu_cp_shifter
|
| Line 278... |
Line 266... |
end generate;
|
end generate;
|
|
|
neorv32_cpu_cp_muldiv_inst_false:
|
neorv32_cpu_cp_muldiv_inst_false:
|
if (CPU_EXTENSION_RISCV_M = false) and (CPU_EXTENSION_RISCV_Zmmul = false) generate
|
if (CPU_EXTENSION_RISCV_M = false) and (CPU_EXTENSION_RISCV_Zmmul = false) generate
|
cp_result(1) <= (others => '0');
|
cp_result(1) <= (others => '0');
|
cp_valid(1) <= cp_start(1); -- to make sure CPU does not get stalled if there is an accidental access
|
cp_valid(1) <= '0';
|
end generate;
|
end generate;
|
|
|
|
|
-- Co-Processor 2: Bit-Manipulation Unit ('B' Extension) ----------------------------------
|
-- Co-Processor 2: Bit-Manipulation Unit ('B' Extension) ----------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
| Line 310... |
Line 298... |
end generate;
|
end generate;
|
|
|
neorv32_cpu_cp_bitmanip_inst_false:
|
neorv32_cpu_cp_bitmanip_inst_false:
|
if (CPU_EXTENSION_RISCV_B = false) generate
|
if (CPU_EXTENSION_RISCV_B = false) generate
|
cp_result(2) <= (others => '0');
|
cp_result(2) <= (others => '0');
|
cp_valid(2) <= cp_start(2); -- to make sure CPU does not get stalled if there is an accidental access
|
cp_valid(2) <= '0';
|
end generate;
|
end generate;
|
|
|
|
|
-- Co-Processor 3: Single-Precision Floating-Point Unit ('Zfinx' Extension) ---------------
|
-- Co-Processor 3: Single-Precision Floating-Point Unit ('Zfinx' Extension) ---------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
| Line 340... |
Line 328... |
|
|
neorv32_cpu_cp_fpu_inst_false:
|
neorv32_cpu_cp_fpu_inst_false:
|
if (CPU_EXTENSION_RISCV_Zfinx = false) generate
|
if (CPU_EXTENSION_RISCV_Zfinx = false) generate
|
cp_result(3) <= (others => '0');
|
cp_result(3) <= (others => '0');
|
fpu_flags_o <= (others => '0');
|
fpu_flags_o <= (others => '0');
|
cp_valid(3) <= cp_start(3); -- to make sure CPU does not get stalled if there is an accidental access
|
cp_valid(3) <= '0';
|
end generate;
|
end generate;
|
|
|
|
|
|
-- Co-Processor 4: Reserved ---------------------------------------------------------------
|
|
-- -------------------------------------------------------------------------------------------
|
|
cp_result(4) <= (others => '0');
|
|
cp_valid(4) <= '0';
|
|
|
|
|
|
-- Co-Processor 5: Reserved ---------------------------------------------------------------
|
|
-- -------------------------------------------------------------------------------------------
|
|
cp_result(5) <= (others => '0');
|
|
cp_valid(5) <= '0';
|
|
|
|
|
|
-- Co-Processor 6: Reserved ---------------------------------------------------------------
|
|
-- -------------------------------------------------------------------------------------------
|
|
cp_result(6) <= (others => '0');
|
|
cp_valid(6) <= '0';
|
|
|
|
|
|
-- Co-Processor 7: Reserved ---------------------------------------------------------------
|
|
-- -------------------------------------------------------------------------------------------
|
|
cp_result(7) <= (others => '0');
|
|
cp_valid(7) <= '0';
|
|
|
|
|
end neorv32_cpu_cpu_rtl;
|
end neorv32_cpu_cpu_rtl;
|
|
|
No newline at end of file
|
No newline at end of file
|
