system: Remember to wire the DCache to the memory!
[firearm.git] / system.v
1 `define BUS_ICACHE 0
2 `define BUS_DCACHE 1
3
4 module System(input clk);
5         wire [7:0] bus_req;
6         wire [7:0] bus_ack;
7         wire [31:0] bus_addr;
8         wire [31:0] bus_rdata;
9         wire [31:0] bus_wdata;
10         wire bus_rd, bus_wr;
11         wire bus_ready;
12
13         wire bus_req_icache;
14         wire bus_req_dcache;
15         assign bus_req = {6'b0, bus_req_dcache, bus_req_icache};
16         wire bus_ack_icache = bus_ack[`BUS_ICACHE];
17         wire bus_ack_dcache = bus_ack[`BUS_DCACHE];
18         
19         wire [31:0] bus_addr_icache;
20         wire [31:0] bus_wdata_icache;
21         wire bus_rd_icache;
22         wire bus_wr_icache;
23         
24         wire [31:0] bus_addr_dcache;
25         wire [31:0] bus_wdata_dcache;
26         wire bus_rd_dcache;
27         wire bus_wr_dcache;
28         
29         wire [31:0] bus_rdata_blockram;
30         wire bus_ready_blockram;
31         
32         assign bus_addr = bus_addr_icache | bus_addr_dcache;
33         assign bus_rdata = bus_rdata_blockram;
34         assign bus_wdata = bus_wdata_icache | bus_wdata_dcache;
35         assign bus_rd = bus_rd_icache | bus_rd_dcache;
36         assign bus_wr = bus_wr_icache | bus_wr_dcache;
37         assign bus_ready = bus_ready_blockram;
38
39         wire [31:0] icache_rd_addr;
40         wire icache_rd_req;
41         wire icache_rd_wait;
42         wire [31:0] icache_rd_data;
43         
44         wire [31:0] dcache_addr;
45         wire dcache_rd_req, dcache_wr_req;
46         wire dcache_rw_wait;
47         wire [31:0] dcache_wr_data, dcache_rd_data;
48         
49         wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2, decode_out_spsr;
50         wire decode_out_carry;
51         
52         wire [3:0] regfile_read_0, regfile_read_1, regfile_read_2, regfile_read_3;
53         wire [31:0] regfile_rdata_0, regfile_rdata_1, regfile_rdata_2, regfile_rdata_3, regfile_spsr;
54         
55         wire execute_out_write_reg;
56         wire [3:0] execute_out_write_num;
57         wire [31:0] execute_out_write_data;
58         wire [31:0] execute_out_op0, execute_out_op1, execute_out_op2;
59         wire [31:0] jmppc;
60         wire jmp;
61         
62         wire memory_out_write_reg;
63         wire [3:0] memory_out_write_num;
64         wire [31:0] memory_out_write_data;
65         
66         wire stall_cause_issue;
67         wire stall_cause_execute;
68         wire stall_cause_memory;
69         wire bubble_out_fetch;
70         wire bubble_out_issue;
71         wire bubble_out_execute;
72         wire bubble_out_memory;
73         wire [31:0] insn_out_fetch;
74         wire [31:0] insn_out_issue;
75         wire [31:0] insn_out_execute;
76         wire [31:0] insn_out_memory;
77         wire [31:0] pc_out_fetch;
78         wire [31:0] pc_out_issue;
79         wire [31:0] pc_out_execute;
80         wire [31:0] pc_out_memory;
81
82         wire execute_out_backflush;
83
84         BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
85
86         ICache icache(
87                 .clk(clk),
88                 /* XXX reset? */
89                 .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
90                 .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
91                 .bus_req(bus_req_icache), .bus_ack(bus_ack_icache),
92                 .bus_addr(bus_addr_icache), .bus_rdata(bus_rdata),
93                 .bus_wdata(bus_wdata_icache), .bus_rd(bus_rd_icache),
94                 .bus_wr(bus_wr_icache), .bus_ready(bus_ready));
95         
96         DCache dcache(
97                 .clk(clk),
98                 .addr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
99                 .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
100                 .bus_req(bus_req_dcache), .bus_ack(bus_ack_dcache),
101                 .bus_addr(bus_addr_dcache), .bus_rdata(bus_rdata),
102                 .bus_wdata(bus_wdata_dcache), .bus_rd(bus_rd_dcache),
103                 .bus_wr(bus_wr_dcache), .bus_ready(bus_ready));
104
105         BlockRAM blockram(
106                 .clk(clk),
107                 .bus_addr(bus_addr), .bus_rdata(bus_rdata_blockram),
108                 .bus_wdata(bus_wdata), .bus_rd(bus_rd), .bus_wr(bus_wr),
109                 .bus_ready(bus_ready_blockram));
110
111         Fetch fetch(
112                 .clk(clk),
113                 .Nrst(1'b1 /* XXX */),
114                 .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
115                 .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
116                 .stall(stall_cause_issue), .jmp(jmp), .jmppc(jmppc),
117                 .bubble(bubble_out_fetch), .insn(insn_out_fetch),
118                 .pc(pc_out_fetch));
119         
120         Issue issue(
121                 .clk(clk),
122                 .Nrst(1'b1 /* XXX */),
123                 .stall(stall_cause_execute), .flush(execute_out_backflush),
124                 .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
125                 .inpc(pc_out_fetch), .cpsr(32'b0 /* XXX */),
126                 .outstall(stall_cause_issue), .outbubble(bubble_out_issue),
127                 .outpc(pc_out_issue), .outinsn(insn_out_issue));
128         
129         RegFile regfile(
130                 .clk(clk),
131                 .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), .read_2(regfile_read_3),
132                 .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), .rdata_2(regfile_rdata_3),
133                 .spsr(regfile_spsr), .write(4'b0), .write_req(1'b0), .write_data(10 /* XXX */));
134         
135         Decode decode(
136                 .clk(clk),
137                 .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(32'b0 /* XXX */), .inspsr(regfile_spsr),
138                 .op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
139                 .carry(decode_out_carry), .outspsr(decode_out_spsr),
140                 .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), 
141                 .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2));
142         
143         Execute execute(
144                 .clk(clk), .Nrst(1'b0),
145                 .stall(stall_cause_memory), .flush(1'b0),
146                 .inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
147                 .cpsr(32'b0 /* XXX */), .spsr(decode_out_spsr), .op0(decode_out_op0), .op1(decode_out_op1),
148                 .op2(decode_out_op2), .carry(decode_out_carry),
149                 .outstall(stall_cause_execute), .outbubble(bubble_out_execute),
150                 .write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
151                 .write_data(execute_out_write_data),
152                 .jmp(jmp), .jmppc(jmppc),
153                 .outpc(pc_out_execute), .outinsn(insn_out_execute),
154                 .outop0(execute_out_op0), .outop1(execute_out_op1), .outop2(execute_out_op2));
155         assign execute_out_backflush = jmp;
156         
157         Memory memory(
158                 .clk(clk), .Nrst(1'b0),
159                 /* stall? flush? */
160                 .busaddr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
161                 .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
162                 .st_read(regfile_read_3), .st_data(regfile_rdata_3),
163                 .inbubble(bubble_out_execute), .pc(pc_out_execute), .insn(insn_out_execute),
164                 .op0(execute_out_op0), .op1(execute_out_op1), .op2(execute_out_op2),
165                 .write_reg(execute_out_write_reg), .write_num(execute_out_write_num), .write_data(execute_out_write_data),
166                 .outstall(stall_cause_memory), .outbubble(bubble_out_memory), 
167                 .outpc(pc_out_memory), .outinsn(insn_out_memory),
168                 .out_write_reg(memory_out_write_reg), .out_write_num(memory_out_write_num), 
169                 .out_write_data(memory_out_write_data));
170
171         reg [31:0] clockno = 0;
172         always @(posedge clk)
173         begin
174                 clockno <= clockno + 1;
175                 $display("------------------------------------------------------------------------------");
176                 $display("%3d: FETCH:            Bubble: %d, Instruction: %08x, PC: %08x", clockno, bubble_out_fetch, insn_out_fetch, pc_out_fetch);
177                 $display("%3d: ISSUE:  Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x", clockno, stall_cause_issue, bubble_out_issue, insn_out_issue, pc_out_issue);
178                 $display("%3d: DECODE:                      op1 %08x, op2 %08x, op3 %08x, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry);
179                 $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);
180                 $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);
181         end
182 endmodule
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