| Line 8... |
Line 8... |
-- # * neorv32_cpu_cp_muldiv.vhd - MULDIV co-processor #
|
-- # * neorv32_cpu_cp_muldiv.vhd - MULDIV co-processor #
|
-- # * neorv32_cpu_ctrl.vhd - CPU control and CSR system #
|
-- # * neorv32_cpu_ctrl.vhd - CPU control and CSR system #
|
-- # * neorv32_cpu_decompressor.vhd - Compressed instructions decoder #
|
-- # * neorv32_cpu_decompressor.vhd - Compressed instructions decoder #
|
-- # * neorv32_cpu_regfile.vhd - Data register file #
|
-- # * neorv32_cpu_regfile.vhd - Data register file #
|
-- # #
|
-- # #
|
|
-- # * neorv32_package.vhd - Main CPU/processor package file #
|
|
-- # #
|
-- # Check out the processor's data sheet for more information: docs/NEORV32.pdf #
|
-- # Check out the processor's data sheet for more information: docs/NEORV32.pdf #
|
-- # ********************************************************************************************* #
|
-- # ********************************************************************************************* #
|
-- # BSD 3-Clause License #
|
-- # BSD 3-Clause License #
|
-- # #
|
-- # #
|
-- # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
|
-- # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
|
| Line 157... |
Line 159... |
assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
|
assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
|
-- PMP regions --
|
-- PMP regions --
|
assert not ((PMP_NUM_REGIONS > pmp_max_r_c) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Number of PMP regions out of valid range." severity error;
|
assert not ((PMP_NUM_REGIONS > pmp_max_r_c) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Number of PMP regions out of valid range." severity error;
|
-- PMP granulartiy --
|
-- PMP granulartiy --
|
assert not (((PMP_GRANULARITY < 1) or (PMP_GRANULARITY > 32)) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Invalid PMP granulartiy (0 < PMP_GRANULARITY < 33)." severity error;
|
assert not (((PMP_GRANULARITY < 1) or (PMP_GRANULARITY > 32)) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Invalid PMP granulartiy (0 < PMP_GRANULARITY < 33)." severity error;
|
|
-- Instruction prefetch buffer size --
|
|
assert not (is_power_of_two_f(ipb_entries_c) = false) report "NEORV32 CPU CONFIG ERROR! Number of entries in instruction prefetch buffer <ipb_entries_c> has to be a power of two." severity error;
|
|
|
|
|
-- Control Unit ---------------------------------------------------------------------------
|
-- Control Unit ---------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
neorv32_cpu_control_inst: neorv32_cpu_control
|
neorv32_cpu_control_inst: neorv32_cpu_control
|
| Line 311... |
Line 315... |
cp0_data <= (others => '0');
|
cp0_data <= (others => '0');
|
cp0_valid <= '0';
|
cp0_valid <= '0';
|
end generate;
|
end generate;
|
|
|
|
|
-- Co-Processor 1: Not implemented yet ----------------------------------------------------
|
-- Co-Processor 1: Not implemented (yet) --------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- control: ctrl cp1_start
|
-- control: ctrl cp1_start
|
-- inputs: rs1 rs2 alu_cmp alu_opb
|
-- inputs: rs1 rs2 alu_cmp alu_opb
|
cp1_data <= (others => '0');
|
cp1_data <= (others => '0');
|
cp1_valid <= '0';
|
cp1_valid <= '0';
|
|
|
|
|
-- Co-Processor 2: Not implemented yet ----------------------------------------------------
|
-- Co-Processor 2: Not implemented (yet) --------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- control: ctrl cp2_start
|
-- control: ctrl cp2_start
|
-- inputs: rs1 rs2 alu_cmp alu_opb
|
-- inputs: rs1 rs2 alu_cmp alu_opb
|
cp2_data <= (others => '0');
|
cp2_data <= (others => '0');
|
cp2_valid <= '0';
|
cp2_valid <= '0';
|
|
|
|
|
-- Co-Processor 3: Not implemented yet ----------------------------------------------------
|
-- Co-Processor 3: Not implemented (yet) --------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- control: ctrl cp3_start
|
-- control: ctrl cp3_start
|
-- inputs: rs1 rs2 alu_cmp alu_opb
|
-- inputs: rs1 rs2 alu_cmp alu_opb
|
cp3_data <= (others => '0');
|
cp3_data <= (others => '0');
|
cp3_valid <= '0';
|
cp3_valid <= '0';
|
| Line 348... |
Line 352... |
PMP_GRANULARITY => PMP_GRANULARITY -- granularity (0=none, 1=8B, 2=16B, 3=32B, ...)
|
PMP_GRANULARITY => PMP_GRANULARITY -- granularity (0=none, 1=8B, 2=16B, 3=32B, ...)
|
)
|
)
|
port map (
|
port map (
|
-- global control --
|
-- global control --
|
clk_i => clk_i, -- global clock, rising edge
|
clk_i => clk_i, -- global clock, rising edge
|
|
rstn_i => rstn_i, -- global reset, low-active, async
|
ctrl_i => ctrl, -- main control bus
|
ctrl_i => ctrl, -- main control bus
|
-- cpu instruction fetch interface --
|
-- cpu instruction fetch interface --
|
fetch_pc_i => fetch_pc, -- PC for instruction fetch
|
fetch_pc_i => fetch_pc, -- PC for instruction fetch
|
instr_o => instr, -- instruction
|
instr_o => instr, -- instruction
|
i_wait_o => bus_i_wait, -- wait for fetch to complete
|
i_wait_o => bus_i_wait, -- wait for fetch to complete
|
