system.v: Silly typo fix -- why didn't Verilator warn me about that?????
[firearm.git] / system.v
index 0c25de3..a8a9ac4 100644 (file)
--- a/system.v
+++ b/system.v
@@ -1,6 +1,6 @@
 `define BUS_ICACHE 0
 
-module System(input clk, output wire bubbleshield, output wire [31:0] insn, output wire [31:0] pc);
+module System(input clk);
        wire [7:0] bus_req;
        wire [7:0] bus_ack;
        wire [31:0] bus_addr;
@@ -27,11 +27,36 @@ module System(input clk, output wire bubbleshield, output wire [31:0] insn, outp
        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_cause_execute;
+       
+       wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2, decode_out_spsr;
+       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, regfile_spsr;
+       wire execute_out_write_reg;
+       wire [3:0] execute_out_write_num;
+       wire [31:0] execute_out_write_data;
+       wire [31:0] jmppc;
+       wire jmp;
+       
+       wire bubble_out_fetch;
+       wire bubble_out_issue;
+       wire bubble_out_execute;
+       wire [31:0] insn_out_fetch;
+       wire [31:0] insn_out_issue;
+       wire [31:0] insn_out_execute;
+       wire [31:0] pc_out_fetch;
+       wire [31:0] pc_out_issue;
+       wire [31:0] pc_out_execute;
+
+       wire execute_out_backflush;
 
        BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
 
@@ -53,10 +78,57 @@ module System(input clk, output wire bubbleshield, output wire [31:0] insn, outp
 
        Fetch fetch(
                .clk(clk),
-               .Nrst(1 /* XXX */),
+               .Nrst(1'b1 /* XXX */),
                .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
                .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
-               .stall(0 /* XXX */), .jmp(0 /* XXX */), .jmppc(0 /* XXX */),
-               .bubble(bubbleshield), .insn(insn), .pc(pc));
+               .stall(stall_cause_issue), .jmp(jmp), .jmppc(jmppc),
+               .bubble(bubble_out_fetch), .insn(insn_out_fetch),
+               .pc(pc_out_fetch));
+       
+       Issue issue(
+               .clk(clk),
+               .Nrst(1'b1 /* XXX */),
+               .stall(stall_cause_execute), .flush(execute_out_backflush),
+               .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
+               .inpc(pc_out_fetch), .cpsr(32'b0 /* 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),
+               .spsr(regfile_spsr), .write(4'b0), .write_req(1'b0), .write_data(10 /* XXX */));
+       
+       Decode decode(
+               .clk(clk),
+               .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(32'b0 /* XXX */), .inspsr(regfile_spsr),
+               .op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
+               .carry(decode_out_carry), .outspsr(decode_out_spsr),
+               .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));
+       
+       Execute execute(
+               .clk(clk), .Nrst(1'b0),
+               .stall(1'b0 /* XXX */), .flush(1'b0),
+               .inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
+               .cpsr(32'b0 /* XXX */), .spsr(decode_out_spsr), .op0(decode_out_op0), .op1(decode_out_op1),
+               .op2(decode_out_op2), .carry(decode_out_carry),
+               .outstall(stall_cause_execute), .outbubble(bubble_out_execute),
+               .write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
+               .write_data(execute_out_write_data),
+               .jmp(jmp), .jmppc(jmppc),
+               .outpc(pc_out_execute), .outinsn(insn_out_execute));
+       assign execute_out_backflush = jmp;
 
+       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);
+               $display("%3d: EXEC:   Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x, Reg: %d, [%08x -> %d], Jmp: %d [%08x]", clockno, stall_cause_execute, bubble_out_execute, insn_out_execute, pc_out_execute, execute_out_write_reg, execute_out_write_data, execute_out_write_num, jmp, jmppc);
+       end
 endmodule
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