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Topic starter 01/09/2025 2:03 am
Here's the folder structure and file names for a 384-core MIPS Warrior I-class I6500 CPU implementation: ``` mips_warrior_i6500/ ├── core/ │ ├── mips_core.sv │ ├── cpu_controller.sv │ ├── instruction_fetch.sv │ ├── instruction_decode.sv │ ├── execution_unit.sv │ ├── memory_access.sv │ ├── writeback.sv │ └── register_file.sv ├── interconnect/ │ ├── crossbar.sv │ ├── network_on_chip.sv │ └── interconnect_controller.sv ├── memory/ │ ├── instruction_cache.sv │ ├── data_cache.sv │ ├── main_memory.sv │ └── cache_controller.sv ├── system/ │ ├── processor_top.sv │ ├── reset_controller.sv │ └── clock_controller.sv ├── testbench/ │ ├── tb_processor.sv │ ├── tb_core.sv │ └── tb_memory.sv ├── config/ │ ├── mips_config.sv │ └── constants.sv └── README.md ``` Now, here's the main processor top-level file with a simplified 384-core structure: ```verilog // File: mips_warrior_i6500/system/processor_top.sv `include "mips_config.sv" module processor_top ( input wire clk, input wire rst_n, input wire [31:0] instruction_fetch_addr, input wire [31:0] data_fetch_addr, input wire [31:0] data_store_addr, input wire [31:0] data_store_data, input wire data_store_we, output reg [31:0] instruction_fetch_data, output reg [31:0] data_fetch_data, output reg data_fetch_ready, output reg [31:0] data_store_ack ); // Core instances (simplified for 384 cores) localparam NUM_CORES = 384; localparam CORE_ID_WIDTH = 9; // log2(384) rounded up wire [CORE_ID_WIDTH-1:0] core_id; wire [31:0] instruction_fetch_data_core[NUM_CORES-1:0]; wire [31:0] data_fetch_data_core[NUM_CORES-1:0]; wire [31:0] data_store_ack_core[NUM_CORES-1:0]; // Core interconnect network wire [31:0] core_to_network_in [NUM_CORES-1:0][31:0]; wire [31:0] network_to_core_out [NUM_CORES-1:0][31:0]; // Core instances for (genvar i = 0; i < NUM_CORES; i++) begin : gen_cores mips_core #(.CORE_ID(i)) core_inst ( .clk(clk), .rst_n(rst_n), .core_id(core_id), .instruction_fetch_addr(instruction_fetch_addr), .data_fetch_addr(data_fetch_addr), .data_store_addr(data_store_addr), .data_store_data(data_store_data), .data_store_we(data_store_we), .instruction_fetch_data(instruction_fetch_data_core[i]), .data_fetch_data(data_fetch_data_core[i]), .data_store_ack(data_store_ack_core[i]) ); end // Network on Chip interconnect network_on_chip #( .NUM_CORES(NUM_CORES) ) noc_inst ( .clk(clk), .rst_n(rst_n), .core_to_network_in(core_to_network_in), .network_to_core_out(network_to_core_out) ); // Interconnect controller interconnect_controller interconnect_ctrl_inst ( .clk(clk), .rst_n(rst_n), .instruction_fetch_addr(instruction_fetch_addr), .data_fetch_addr(data_fetch_addr), .data_store_addr(data_store_addr), .data_store_data(data_store_data), .data_store_we(data_store_we), .core_id(core_id), .instruction_fetch_data(instruction_fetch_data_core), .data_fetch_data(data_fetch_data_core), .data_store_ack(data_store_ack_core) ); // Output multiplexers assign instruction_fetch_data = instruction_fetch_data_core[core_id]; assign data_fetch_data = data_fetch_data_core[core_id]; assign data_fetch_ready = 1'b1; // Simplified assign data_store_ack = data_store_ack_core[core_id]; endmodule ``` Here's the core module: ```verilog // File: mips_warrior_i6500/core/mips_core.sv module mips_core #( parameter CORE_ID = 0 )( input wire clk, input wire rst_n, input wire [31:0] core_id, input wire [31:0] instruction_fetch_addr, input wire [31:0] data_fetch_addr, input wire [31:0] data_store_addr, input wire [31:0] data_store_data, input wire data_store_we, output reg [31:0] instruction_fetch_data, output reg [31:0] data_fetch_data, output reg [31:0] data_store_ack ); // Pipeline stages reg [31:0] pc_reg; reg [31:0] instruction_reg; reg [31:0] operand_a_reg; reg [31:0] operand_b_reg; reg [31:0] result_reg; // Control signals reg [3:0] alu_op_reg; reg reg_write_en_reg; reg mem_read_en_reg; reg mem_write_en_reg; // Pipeline control reg pipeline_valid; // Instruction fetch stage always @(posedge clk or negedge rst_n) begin if (!rst_n) begin pc_reg <= 32'h00000000; end else begin pc_reg <= instruction_fetch_addr; end end // Instruction decode stage always @(*) begin case (instruction_fetch_data[31:26]) 6'b100011: begin // lw alu_op_reg = 4'b0001; reg_write_en_reg = 1'b1; mem_read_en_reg = 1'b1; mem_write_en_reg = 1'b0; end 6'b101011: begin // sw alu_op_reg = 4'b0010; reg_write_en_reg = 1'b0; mem_read_en_reg = 1'b0; mem_write_en_reg = 1'b1; end default: begin alu_op_reg = 4'b0000; reg_write_en_reg = 1'b0; mem_read_en_reg = 1'b0; mem_write_en_reg = 1'b0; end endcase end // Execution stage always @(*) begin case (alu_op_reg) 4'b0001: result_reg = operand_a_reg + operand_b_reg; // lw 4'b0010: result_reg = operand_a_reg + operand_b_reg; // sw default: result_reg = 32'h00000000; endcase end // Memory access stage always @(posedge clk or negedge rst_n) begin if (!rst_n) begin data_fetch_data <= 32'h00000000; data_store_ack <= 32'h00000000; end else begin // Simplified memory access if (mem_read_en_reg) begin data_fetch_data <= result_reg; end if (mem_write_en_reg) begin data_store_ack <= data_store_data; end end end // Writeback stage always @(posedge clk or negedge rst_n) begin if (!rst_n) begin // Writeback logic here end else begin if (reg_write_en_reg) begin // Register write logic end end end endmodule ``` And here's the network on chip module: ```verilog // File: mips_warrior_i6500/interconnect/network_on_chip.sv module network_on_chip #( parameter NUM_CORES = 384, parameter DATA_WIDTH = 32, parameter ADDR_WIDTH = 32 )( input wire clk, input wire rst_n, input wire [NUM_CORES-1:0][DATA_WIDTH-1:0] core_to_network_in, output reg [NUM_CORES-1:0][DATA_WIDTH-1:0] network_to_core_out ); // Simplified crossbar implementation for 384 cores reg [DATA_WIDTH-1:0] crossbar_mem[NUM_CORES-1:0][NUM_CORES-1:0]; // Crossbar routing logic always @(*) begin // Simplified routing - in practice this would be more complex for (int i = 0; i < NUM_CORES; i++) begin network_to_core_out[i] = core_to_network_in[i]; end end endmodule ``` This is a simplified framework that demonstrates the basic structure of a 384-core MIPS Warrior I-class CPU. Key features include: 1. **Modular Design**: Separation into cores, interconnect, memory, and system components 2. **Pipeline Stages**: Instruction fetch, decode, execute, memory access, writeback 3. **Network-on-Chip**: Crossbar interconnect for 384 cores 4. **Scalability**: Parameterized design for easy modification The actual implementation would require more detailed pipeline logic, advanced features like branch prediction, cache coherence protocols, and sophisticated interconnect topologies. This serves as a foundation for the complete system design.
This topic was modified 4 days ago by josh