Add wires for ALU.

[firearm.git] / system.v

diff --git a/system.v b/system.v
index 251b43c348dd3d84e8ff14553e0ea2266014f563..a4d13a43042d3bd2a8e5062527ccac2722190bf2 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;
@@ -34,13 +34,16 @@ module System(input clk, output wire bubbleshield, output wire [31:0] insn, outp
        wire [31:0] icache_rd_data;
        
        wire stall_cause_issue;
+       wire stall_cause_execute;
        
-       wire stall_in_fetch = stall_cause_issue;
-       wire stall_in_issue = 0;
-       
-       wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2, decode_out_cpsr;
+       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 execute_out_stall, execute_out_bubble;
+       wire execute_out_write_reg;
+       wire [3:0] execute_out_write_num;
+       wire [31:0] execute_out_write_data;
        
        wire bubble_out_fetch;
        wire bubble_out_issue;
@@ -49,10 +52,6 @@ module System(input clk, output wire bubbleshield, output wire [31:0] insn, outp
        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 icache(
@@ -73,19 +72,19 @@ 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(stall_in_fetch), .jmp(0 /* XXX */), .jmppc(0 /* XXX */),
+               .stall(stall_cause_issue), .jmp(1'b0 /* XXX */), .jmppc(32'b0 /* 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 */),
+               .Nrst(1'b1 /* XXX */),
+               .stall(stall_cause_execute), .flush(1'b0 /* XXX */),
                .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
-               .inpc(pc_out_fetch), .cpsr(0 /* XXX */),
+               .inpc(pc_out_fetch), .cpsr(32'b0 /* XXX */),
                .outstall(stall_cause_issue), .outbubble(bubble_out_issue),
                .outpc(pc_out_issue), .outinsn(insn_out_issue));
        
@@ -93,16 +92,26 @@ module System(input clk, output wire bubbleshield, output wire [31:0] insn, outp
                .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 */));
+               .write(4'b0), .write_req(1'b0), .write_data(10 /* XXX */));
        
        Decode decode(
                .clk(clk),
-               .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(0 /* XXX */),
+               .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(32'b0 /* XXX */),
                .op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
-               .outcpsr(decode_out_cpsr),
+               .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));
        
+       Execute execute(
+               .clk(clk), .Nrst(1'b0),
+               .stall(1'b0 /* XXX */), .flush(1'b0 /* XXX */),
+               .inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
+               .cpsr(32'b0 /* XXX */), .op0(decode_out_op0), .op1(decode_out_op1),
+               .op2(decode_out_op2), .carry(decode_out_carry),
+               .outstall(stall_cause_execute), .outbubble(execute_out_bubble),
+               .write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
+               .write_data(execute_out_write_data));
+       
        reg [31:0] clockno = 0;
        always @(posedge clk)
        begin
@@ -110,6 +119,6 @@ module System(input clk, output wire bubbleshield, output wire [31:0] insn, outp
                $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, cpsr %08x", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_cpsr);
+               $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