X-Git-Url: http://git.joshuawise.com/firearm.git/blobdiff_plain/ee4068391a94ca33bcec919274ef17496c0a7d6b..932d2ed6999912bd7a85a3972a48109c127570f3:/system.v?ds=inline diff --git a/system.v b/system.v index a653ea1..fb28c4f 100644 --- a/system.v +++ b/system.v @@ -1,30 +1,116 @@ `define BUS_ICACHE 0 -module System(); +module System(input clk, output wire bubbleshield, output wire [31:0] insn, output wire [31:0] pc); wire [7:0] bus_req; wire [7:0] bus_ack; wire [31:0] bus_addr; - wire [31:0] bus_data; + wire [31:0] bus_rdata; + wire [31:0] bus_wdata; wire bus_rd, bus_wr; wire bus_ready; - - wire bus_req_icache = bus_req[`BUS_ICACHE]; + + wire bus_req_icache; + assign bus_req = {7'b0, bus_req_icache}; wire bus_ack_icache = bus_ack[`BUS_ICACHE]; + wire [31:0] bus_addr_icache; wire [31:0] bus_wdata_icache; wire bus_rd_icache; wire bus_wr_icache; + wire [31:0] bus_rdata_blockram; + wire bus_ready_blockram; + assign bus_addr = bus_addr_icache; - assign bus_data = bus_wdata_icache; + assign bus_rdata = bus_rdata_blockram; + assign bus_wdata = bus_wdata_icache; assign bus_rd = bus_rd_icache; assign bus_wr = bus_wr_icache; + assign bus_ready = bus_ready_blockram; + + wire [31:0] icache_rd_addr; + wire icache_rd_req; + wire icache_rd_wait; + wire [31:0] icache_rd_data; + + wire stall_cause_issue; + + wire stall_in_fetch = stall_cause_issue; + wire stall_in_issue = 0; + + wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2; + wire decode_out_carry; + wire [3:0] regfile_read_0, regfile_read_1, regfile_read_2; + wire [31:0] regfile_rdata_0, regfile_rdata_1, regfile_rdata_2; + + wire bubble_out_fetch; + wire bubble_out_issue; + wire [31:0] insn_out_fetch; + wire [31:0] insn_out_issue; + wire [31:0] pc_out_fetch; + wire [31:0] pc_out_issue; + + assign bubbleshield = bubble_out_issue; + assign insn = insn_out_issue; + assign pc = pc_out_issue; BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack)); - ICache( - .rd_addr(), .rd_req(), .rd_wait(), .rd_data(), + + ICache icache( + .clk(clk), + /* XXX reset? */ + .rd_addr(icache_rd_addr), .rd_req(icache_rd_req), + .rd_wait(icache_rd_wait), .rd_data(icache_rd_data), .bus_req(bus_req_icache), .bus_ack(bus_ack_icache), - .bus_addr(bus_addr_icache), .bus_rdata(bus_data), + .bus_addr(bus_addr_icache), .bus_rdata(bus_rdata), .bus_wdata(bus_wdata_icache), .bus_rd(bus_rd_icache), .bus_wr(bus_wr_icache), .bus_ready(bus_ready)); + + BlockRAM blockram( + .clk(clk), + .bus_addr(bus_addr), .bus_rdata(bus_rdata_blockram), + .bus_wdata(bus_wdata), .bus_rd(bus_rd), .bus_wr(bus_wr), + .bus_ready(bus_ready_blockram)); + + Fetch fetch( + .clk(clk), + .Nrst(1 /* XXX */), + .rd_addr(icache_rd_addr), .rd_req(icache_rd_req), + .rd_wait(icache_rd_wait), .rd_data(icache_rd_data), + .stall(stall_in_fetch), .jmp(0 /* XXX */), .jmppc(0 /* XXX */), + .bubble(bubble_out_fetch), .insn(insn_out_fetch), + .pc(pc_out_fetch)); + + Issue issue( + .clk(clk), + .Nrst(1 /* XXX */), + .stall(stall_in_issue), .flush(0 /* XXX */), + .inbubble(bubble_out_fetch), .insn(insn_out_fetch), + .inpc(pc_out_fetch), .cpsr(0 /* XXX */), + .outstall(stall_cause_issue), .outbubble(bubble_out_issue), + .outpc(pc_out_issue), .outinsn(insn_out_issue)); + + RegFile regfile( + .clk(clk), + .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), + .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), + .write(0), .write_req(0), .write_data(0 /* XXX */)); + + Decode decode( + .clk(clk), + .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(0 /* XXX */), + .op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2), + .carry(decode_out_carry), + .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), + .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2)); + + reg [31:0] clockno = 0; + always @(posedge clk) + begin + clockno <= clockno + 1; + $display("------------------------------------------------------------------------------"); + $display("%3d: FETCH: Bubble: %d, Instruction: %08x, PC: %08x", clockno, bubble_out_fetch, insn_out_fetch, pc_out_fetch); + $display("%3d: ISSUE: Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x", clockno, stall_cause_issue, bubble_out_issue, insn_out_issue, pc_out_issue); + $display("%3d: DECODE: op1 %08x, op2 %08x, op3 %08x, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry); + end endmodule