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] execute_out_cpsr, execute_out_spsr;
  60         wire [31:0] jmppc;
  61         wire jmp;
  62
  63         wire memory_out_write_reg;
  64         wire [3:0] memory_out_write_num;
  65         wire [31:0] memory_out_write_data;
  66
  67         wire cp_req;
  68         wire cp_ack = 0;
  69         wire cp_busy = 0;
  70         wire cp_rnw;
  71         wire [31:0] cp_read = 0;
  72         wire [31:0] cp_write;
  73
  74         wire stall_cause_issue;
  75         wire stall_cause_execute;
  76         wire stall_cause_memory;
  77         wire bubble_out_fetch;
  78         wire bubble_out_issue;
  79         wire bubble_out_execute;
  80         wire bubble_out_memory;
  81         wire [31:0] insn_out_fetch;
  82         wire [31:0] insn_out_issue;
  83         wire [31:0] insn_out_execute;
  84         wire [31:0] insn_out_memory;
  85         wire [31:0] pc_out_fetch;
  86         wire [31:0] pc_out_issue;
  87         wire [31:0] pc_out_execute;
  88         wire [31:0] pc_out_memory;
  89
  90         wire execute_out_backflush;
  91
  92         BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
  93
  94         ICache icache(
  95                 .clk(clk),
  96                 /* XXX reset? */
  97                 .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
  98                 .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
  99                 .bus_req(bus_req_icache), .bus_ack(bus_ack_icache),
 100                 .bus_addr(bus_addr_icache), .bus_rdata(bus_rdata),
 101                 .bus_wdata(bus_wdata_icache), .bus_rd(bus_rd_icache),
 102                 .bus_wr(bus_wr_icache), .bus_ready(bus_ready));
 103
 104         DCache dcache(
 105                 .clk(clk),
 106                 .addr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
 107                 .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
 108                 .bus_req(bus_req_dcache), .bus_ack(bus_ack_dcache),
 109                 .bus_addr(bus_addr_dcache), .bus_rdata(bus_rdata),
 110                 .bus_wdata(bus_wdata_dcache), .bus_rd(bus_rd_dcache),
 111                 .bus_wr(bus_wr_dcache), .bus_ready(bus_ready));
 112
 113         BlockRAM blockram(
 114                 .clk(clk),
 115                 .bus_addr(bus_addr), .bus_rdata(bus_rdata_blockram),
 116                 .bus_wdata(bus_wdata), .bus_rd(bus_rd), .bus_wr(bus_wr),
 117                 .bus_ready(bus_ready_blockram));
 118
 119         Fetch fetch(
 120                 .clk(clk),
 121                 .Nrst(1'b1 /* XXX */),
 122                 .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
 123                 .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
 124                 .stall(stall_cause_issue), .jmp(jmp), .jmppc(jmppc),
 125                 .bubble(bubble_out_fetch), .insn(insn_out_fetch),
 126                 .pc(pc_out_fetch));
 127
 128         Issue issue(
 129                 .clk(clk),
 130                 .Nrst(1'b1 /* XXX */),
 131                 .stall(stall_cause_execute), .flush(execute_out_backflush),
 132                 .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
 133                 .inpc(pc_out_fetch), .cpsr(32'b0 /* XXX */),
 134                 .outstall(stall_cause_issue), .outbubble(bubble_out_issue),
 135                 .outpc(pc_out_issue), .outinsn(insn_out_issue));
 136
 137         RegFile regfile(
 138                 .clk(clk),
 139                 .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), .read_2(regfile_read_3),
 140                 .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), .rdata_2(regfile_rdata_3),
 141                 .spsr(regfile_spsr), .write(4'b0), .write_req(1'b0), .write_data(10 /* XXX */));
 142
 143         Decode decode(
 144                 .clk(clk),
 145                 .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(32'b0 /* XXX */), .inspsr(regfile_spsr),
 146                 .op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
 147                 .carry(decode_out_carry), .outspsr(decode_out_spsr),
 148                 .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2),
 149                 .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2));
 150
 151         Execute execute(
 152                 .clk(clk), .Nrst(1'b0),
 153                 .stall(stall_cause_memory), .flush(1'b0),
 154                 .inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
 155                 .cpsr(32'b0 /* XXX */), .spsr(decode_out_spsr), .op0(decode_out_op0), .op1(decode_out_op1),
 156                 .op2(decode_out_op2), .carry(decode_out_carry),
 157                 .outstall(stall_cause_execute), .outbubble(bubble_out_execute),
 158                 .write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
 159                 .write_data(execute_out_write_data),
 160                 .jmp(jmp), .jmppc(jmppc),
 161                 .outpc(pc_out_execute), .outinsn(insn_out_execute),
 162                 .outop0(execute_out_op0), .outop1(execute_out_op1), .outop2(execute_out_op2),
 163                 .outcpsr(execute_out_cpsr), .outspsr(execute_out_spsr));
 164         assign execute_out_backflush = jmp;
 165
 166         Memory memory(
 167                 .clk(clk), .Nrst(1'b0),
 168                 /* stall? flush? */
 169                 .busaddr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
 170                 .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
 171                 .st_read(regfile_read_3), .st_data(regfile_rdata_3),
 172                 .inbubble(bubble_out_execute), .pc(pc_out_execute), .insn(insn_out_execute),
 173                 .op0(execute_out_op0), .op1(execute_out_op1), .op2(execute_out_op2),
 174                 .spsr(execute_out_spsr), .cpsr(execute_out_cpsr),
 175                 .write_reg(execute_out_write_reg), .write_num(execute_out_write_num), .write_data(execute_out_write_data),
 176                 .outstall(stall_cause_memory), .outbubble(bubble_out_memory),
 177                 .outpc(pc_out_memory), .outinsn(insn_out_memory),
 178                 .out_write_reg(memory_out_write_reg), .out_write_num(memory_out_write_num),
 179                 .out_write_data(memory_out_write_data),
 180                 .cp_req(cp_req), .cp_ack(cp_ack), .cp_busy(cp_busy), .cp_rnw(cp_rnw), .cp_read(cp_read), .cp_write(cp_write));
 181
 182         reg [31:0] clockno = 0;
 183         always @(posedge clk)
 184         begin
 185                 clockno <= clockno + 1;
 186                 $display("------------------------------------------------------------------------------");
 187                 $display("%3d: FETCH:            Bubble: %d, Instruction: %08x, PC: %08x", clockno, bubble_out_fetch, insn_out_fetch, pc_out_fetch);
 188                 $display("%3d: ISSUE:  Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x", clockno, stall_cause_issue, bubble_out_issue, insn_out_issue, pc_out_issue);
 189                 $display("%3d: DECODE:                      op1 %08x, op2 %08x, op3 %08x, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry);
 190                 $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);
 191                 $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);
 192         end
 193 endmodule