Wire in Memory. Fix small bug in Memory involving registers never ever getting outpu...
authorJoshua Wise <joshua@rebirth.joshuawise.com>
Tue, 6 Jan 2009 08:15:58 +0000 (03:15 -0500)
committerJoshua Wise <joshua@rebirth.joshuawise.com>
Tue, 6 Jan 2009 08:15:58 +0000 (03:15 -0500)
Execute.v
Memory.v
system.v

index cd71d76..7f4cf6c 100644 (file)
--- a/Execute.v
+++ b/Execute.v
@@ -25,7 +25,8 @@ module Execute(
        output reg [31:0] jmppc,
        output reg jmp,
        output reg [31:0] outpc,
-       output reg [31:0] outinsn
+       output reg [31:0] outinsn,
+       output reg [31:0] outop0, outop1, outop2
        );
        
        reg mult_start;
@@ -69,6 +70,9 @@ module Execute(
                        write_data <= next_write_data;
                        outpc <= pc;
                        outinsn <= insn;
+                       outop0 <= op0;
+                       outop1 <= op1;
+                       outop2 <= op2;
                end
        end
 
index 2378177..e10a2e7 100644 (file)
--- a/Memory.v
+++ b/Memory.v
@@ -37,11 +37,11 @@ module Memory(
        output reg [31:0] out_write_data = 32'hxxxxxxxx
        );
 
-       reg [31:0] addr, raddr, next_regdata;
-       reg [3:0] next_regsel;
-       reg next_writeback, next_notdone, next_inc_next;
+       reg [31:0] addr, raddr;
+       reg next_notdone, next_inc_next;
        reg [31:0] align_s1, align_s2, align_rddata;
-       
+
+       wire next_outbubble;    
        wire next_write_reg;
        wire [3:0] next_write_num;
        wire [31:0] next_write_data;
@@ -55,10 +55,10 @@ module Memory(
        begin
                outpc <= pc;
                outinsn <= insn;
-               outbubble <= rw_wait;
-               out_write_reg <= next_writeback;
-               out_write_num <= next_regsel;
-               out_write_data <= next_regdata;
+               outbubble <= next_outbubble;
+               out_write_reg <= next_write_reg;
+               out_write_num <= next_write_num;
+               out_write_data <= next_write_data;
                notdone <= next_notdone;
                inc_next <= next_inc_next;
                regs <= next_regs;
@@ -78,12 +78,14 @@ module Memory(
                next_write_num = write_num;
                next_write_data = write_data;
                next_inc_next = 1'b0;
+               next_outbubble = inbubble;
                outstall = 1'b0;
                
                casez(insn)
                `DECODE_LDRSTR_UNDEFINED: begin end
                `DECODE_LDRSTR: begin
                        if (!inbubble) begin
+                               next_outbubble = rw_wait;
                                outstall = rw_wait | notdone;
                        
                                addr = insn[23] ? op0 + op1 : op0 - op1; /* up/down select */
index da9d701..a0c35d6 100644 (file)
--- a/system.v
+++ b/system.v
@@ -46,28 +46,38 @@ module System(input clk);
        wire dcache_rw_wait;
        wire [31:0] dcache_wr_data, dcache_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 [3:0] regfile_read_0, regfile_read_1, regfile_read_2, regfile_read_3;
+       wire [31:0] regfile_rdata_0, regfile_rdata_1, regfile_rdata_2, regfile_rdata_3, regfile_spsr;
+       
        wire execute_out_write_reg;
        wire [3:0] execute_out_write_num;
        wire [31:0] execute_out_write_data;
+       wire [31:0] execute_out_op0, execute_out_op1, execute_out_op2;
        wire [31:0] jmppc;
        wire jmp;
        
+       wire memory_out_write_reg;
+       wire [3:0] memory_out_write_num;
+       wire [31:0] memory_out_write_data;
+       
+       wire stall_cause_issue;
+       wire stall_cause_execute;
+       wire stall_cause_memory;
        wire bubble_out_fetch;
        wire bubble_out_issue;
        wire bubble_out_execute;
+       wire bubble_out_memory;
        wire [31:0] insn_out_fetch;
        wire [31:0] insn_out_issue;
        wire [31:0] insn_out_execute;
+       wire [31:0] insn_out_memory;
        wire [31:0] pc_out_fetch;
        wire [31:0] pc_out_issue;
        wire [31:0] pc_out_execute;
+       wire [31:0] pc_out_memory;
 
        wire execute_out_backflush;
 
@@ -118,8 +128,8 @@ module System(input clk);
        
        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),
+               .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), .read_2(regfile_read_3),
+               .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), .rdata_2(regfile_rdata_3),
                .spsr(regfile_spsr), .write(4'b0), .write_req(1'b0), .write_data(10 /* XXX */));
        
        Decode decode(
@@ -132,7 +142,7 @@ module System(input clk);
        
        Execute execute(
                .clk(clk), .Nrst(1'b0),
-               .stall(1'b0 /* XXX */), .flush(1'b0),
+               .stall(stall_cause_memory), .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),
@@ -140,8 +150,21 @@ module System(input clk);
                .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));
+               .outpc(pc_out_execute), .outinsn(insn_out_execute),
+               .outop0(execute_out_op0), .outop1(execute_out_op1), .outop2(execute_out_op2));
        assign execute_out_backflush = jmp;
+       
+       Memory memory(
+               .clk(clk), .Nrst(1'b0),
+               /* stall? flush? */
+               .st_read(regfile_read_3), .st_data(regfile_rdata_3),
+               .inbubble(bubble_out_execute), .pc(pc_out_execute), .insn(insn_out_execute),
+               .op0(execute_out_op0), .op1(execute_out_op1), .op2(execute_out_op2),
+               .write_reg(execute_out_write_reg), .write_num(execute_out_write_num), .write_data(execute_out_write_data),
+               .outstall(stall_cause_memory), .outbubble(bubble_out_memory), 
+               .outpc(pc_out_memory), .outinsn(insn_out_memory),
+               .out_write_reg(memory_out_write_reg), .out_write_num(memory_out_write_num), 
+               .out_write_data(memory_out_write_data));
 
        reg [31:0] clockno = 0;
        always @(posedge clk)
@@ -152,5 +175,6 @@ module System(input clk);
                $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);
+               $display("%3d: MEMORY: Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x, Reg: %d, [%08x -> %d]", clockno, stall_cause_memory, bubble_out_memory, insn_out_memory, pc_out_memory, memory_out_write_reg, memory_out_write_data, memory_out_write_num);
        end
 endmodule
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