system.v

   1 `define BUS_ICACHE 1
   2 `define BUS_DCACHE 0
   3
   4 module System(input clk, input rst
   5 `ifdef verilator
   6 `else
   7         , output wire [8:0] sys_odata,
   8         input [8:0] sys_idata,
   9         output wire sys_tookdata
  10 `endif
  11         );
  12
  13         wire [7:0] bus_req;
  14         wire [7:0] bus_ack;
  15         wire [31:0] bus_addr;
  16         wire [31:0] bus_rdata;
  17         wire [31:0] bus_wdata;
  18         wire bus_rd, bus_wr;
  19         wire bus_ready;
  20
  21         wire bus_req_icache;
  22         wire bus_req_dcache;
  23         assign bus_req = {6'b0, bus_req_icache, bus_req_dcache};
  24         wire bus_ack_icache = bus_ack[`BUS_ICACHE];
  25         wire bus_ack_dcache = bus_ack[`BUS_DCACHE];
  26
  27         wire [31:0] bus_addr_icache;
  28         wire [31:0] bus_wdata_icache;
  29         wire bus_rd_icache;
  30         wire bus_wr_icache;
  31
  32         wire [31:0] bus_addr_dcache;
  33         wire [31:0] bus_wdata_dcache;
  34         wire bus_rd_dcache;
  35         wire bus_wr_dcache;
  36
  37         wire [31:0] bus_rdata_blockram;
  38         wire bus_ready_blockram;
  39
  40         assign bus_addr = bus_addr_icache | bus_addr_dcache;
  41         assign bus_rdata = bus_rdata_blockram;
  42         assign bus_wdata = bus_wdata_icache | bus_wdata_dcache;
  43         assign bus_rd = bus_rd_icache | bus_rd_dcache;
  44         assign bus_wr = bus_wr_icache | bus_wr_dcache;
  45         assign bus_ready = bus_ready_blockram;
  46
  47         wire [31:0] icache_rd_addr;
  48         wire icache_rd_req;
  49         wire icache_rd_wait;
  50         wire [31:0] icache_rd_data;
  51
  52         wire [31:0] dcache_addr;
  53         wire dcache_rd_req, dcache_wr_req;
  54         wire dcache_rw_wait;
  55         wire [31:0] dcache_wr_data, dcache_rd_data;
  56
  57         wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2, decode_out_spsr, decode_out_cpsr;
  58         wire decode_out_carry;
  59
  60         wire [3:0] regfile_read_0, regfile_read_1, regfile_read_2, regfile_read_3;
  61         wire [31:0] regfile_rdata_0, regfile_rdata_1, regfile_rdata_2, regfile_rdata_3, regfile_spsr;
  62         wire regfile_write;
  63         wire [3:0] regfile_write_reg;
  64         wire [31:0] regfile_write_data;
  65
  66         wire execute_out_write_reg;
  67         wire [3:0] execute_out_write_num;
  68         wire [31:0] execute_out_write_data;
  69         wire [31:0] execute_out_op0, execute_out_op1, execute_out_op2;
  70         wire [31:0] execute_out_cpsr, execute_out_spsr;
  71         wire execute_out_cpsrup;
  72
  73         wire jmp_out_execute, jmp_out_writeback;
  74         wire [31:0] jmppc_out_execute, jmppc_out_writeback;
  75         wire jmp = jmp_out_execute | jmp_out_writeback;
  76         wire [31:0] jmppc = jmppc_out_execute | jmppc_out_writeback;
  77
  78         wire memory_out_write_reg;
  79         wire [3:0] memory_out_write_num;
  80         wire [31:0] memory_out_write_data;
  81         wire [31:0] memory_out_cpsr, memory_out_spsr;
  82         wire memory_out_cpsrup;
  83
  84         wire [31:0] writeback_out_cpsr, writeback_out_spsr;
  85
  86         wire cp_ack_terminal;
  87         wire cp_busy_terminal;
  88         wire [31:0] cp_read_terminal;
  89
  90         wire cp_req;
  91         wire [31:0] cp_insn;
  92         wire cp_ack = cp_ack_terminal;
  93         wire cp_busy = cp_busy_terminal;
  94         wire cp_rnw;
  95         wire [31:0] cp_read = cp_read_terminal;
  96         wire [31:0] cp_write;
  97
  98         wire stall_cause_issue;
  99         wire stall_cause_execute;
 100         wire stall_cause_memory;
 101         wire bubble_out_fetch;
 102         wire bubble_out_issue;
 103         wire bubble_out_execute;
 104         wire bubble_out_memory;
 105         wire [31:0] insn_out_fetch;
 106         wire [31:0] insn_out_issue;
 107         wire [31:0] insn_out_execute;
 108         wire [31:0] insn_out_memory;
 109         wire [31:0] pc_out_fetch;
 110         wire [31:0] pc_out_issue;
 111         wire [31:0] pc_out_execute;
 112         wire [31:0] pc_out_memory;
 113
 114         wire execute_out_backflush;
 115         wire writeback_out_backflush;
 116
 117         BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
 118
 119         ICache icache(
 120                 .clk(clk),
 121                 /* XXX reset? */
 122                 .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
 123                 .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
 124                 .bus_req(bus_req_icache), .bus_ack(bus_ack_icache),
 125                 .bus_addr(bus_addr_icache), .bus_rdata(bus_rdata),
 126                 .bus_wdata(bus_wdata_icache), .bus_rd(bus_rd_icache),
 127                 .bus_wr(bus_wr_icache), .bus_ready(bus_ready));
 128
 129         DCache dcache(
 130                 .clk(clk),
 131                 .addr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
 132                 .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
 133                 .bus_req(bus_req_dcache), .bus_ack(bus_ack_dcache),
 134                 .bus_addr(bus_addr_dcache), .bus_rdata(bus_rdata),
 135                 .bus_wdata(bus_wdata_dcache), .bus_rd(bus_rd_dcache),
 136                 .bus_wr(bus_wr_dcache), .bus_ready(bus_ready));
 137
 138 `ifdef verilator
 139         BigBlockRAM
 140 `else
 141         BlockRAM
 142 `endif
 143         blockram(
 144                 .clk(clk),
 145                 .bus_addr(bus_addr), .bus_rdata(bus_rdata_blockram),
 146                 .bus_wdata(bus_wdata), .bus_rd(bus_rd), .bus_wr(bus_wr),
 147                 .bus_ready(bus_ready_blockram));
 148
 149         Fetch fetch(
 150                 .clk(clk),
 151                 .Nrst(~rst),
 152                 .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
 153                 .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
 154                 .stall(stall_cause_issue), .jmp(jmp), .jmppc(jmppc),
 155                 .bubble(bubble_out_fetch), .insn(insn_out_fetch),
 156                 .pc(pc_out_fetch));
 157
 158         Issue issue(
 159                 .clk(clk),
 160                 .Nrst(~rst),
 161                 .stall(stall_cause_execute), .flush(execute_out_backflush | writeback_out_backflush),
 162                 .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
 163                 .inpc(pc_out_fetch), .cpsr(writeback_out_cpsr),
 164                 .outstall(stall_cause_issue), .outbubble(bubble_out_issue),
 165                 .outpc(pc_out_issue), .outinsn(insn_out_issue));
 166
 167         RegFile regfile(
 168                 .clk(clk), .Nrst(~rst),
 169                 .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), .read_3(regfile_read_3),
 170                 .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), .rdata_3(regfile_rdata_3),
 171                 .spsr(regfile_spsr),
 172                 .write(regfile_write), .write_reg(regfile_write_reg), .write_data(regfile_write_data));
 173
 174         Decode decode(
 175                 .clk(clk),
 176                 .stall(stall_cause_execute),
 177                 .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(writeback_out_cpsr), .inspsr(writeback_out_spsr),
 178                 .op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
 179                 .carry(decode_out_carry), .outcpsr(decode_out_cpsr), .outspsr(decode_out_spsr),
 180                 .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2),
 181                 .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2));
 182
 183         Execute execute(
 184                 .clk(clk), .Nrst(~rst),
 185                 .stall(stall_cause_memory), .flush(writeback_out_backflush),
 186                 .inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
 187                 .cpsr(decode_out_cpsr), .spsr(decode_out_spsr), .op0(decode_out_op0), .op1(decode_out_op1),
 188                 .op2(decode_out_op2), .carry(decode_out_carry),
 189                 .outstall(stall_cause_execute), .outbubble(bubble_out_execute),
 190                 .write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
 191                 .write_data(execute_out_write_data),
 192                 .jmp(jmp_out_execute), .jmppc(jmppc_out_execute),
 193                 .outpc(pc_out_execute), .outinsn(insn_out_execute),
 194                 .outop0(execute_out_op0), .outop1(execute_out_op1), .outop2(execute_out_op2),
 195                 .outcpsr(execute_out_cpsr), .outspsr(execute_out_spsr), .outcpsrup(execute_out_cpsrup));
 196         assign execute_out_backflush = jmp;
 197
 198         assign cp_insn = insn_out_execute;
 199         Memory memory(
 200                 .clk(clk), .Nrst(~rst),
 201                 /* stall? */ .flush(writeback_out_backflush),
 202                 .busaddr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
 203                 .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
 204                 .st_read(regfile_read_3), .st_data(regfile_rdata_3),
 205                 .inbubble(bubble_out_execute), .pc(pc_out_execute), .insn(insn_out_execute),
 206                 .op0(execute_out_op0), .op1(execute_out_op1), .op2(execute_out_op2),
 207                 .spsr(execute_out_spsr), .cpsr(execute_out_cpsr), .cpsrup(execute_out_cpsrup),
 208                 .write_reg(execute_out_write_reg), .write_num(execute_out_write_num), .write_data(execute_out_write_data),
 209                 .outstall(stall_cause_memory), .outbubble(bubble_out_memory),
 210                 .outpc(pc_out_memory), .outinsn(insn_out_memory),
 211                 .out_write_reg(memory_out_write_reg), .out_write_num(memory_out_write_num),
 212                 .out_write_data(memory_out_write_data),
 213                 .cp_req(cp_req), .cp_ack(cp_ack), .cp_busy(cp_busy), .cp_rnw(cp_rnw), .cp_read(cp_read), .cp_write(cp_write),
 214                 .outcpsr(memory_out_cpsr), .outspsr(memory_out_spsr), .outcpsrup(memory_out_cpsrup) /* XXX data_size */);
 215
 216         Terminal terminal(
 217                 .clk(clk),
 218                 .cp_req(cp_req), .cp_insn(cp_insn), .cp_ack(cp_ack_terminal), .cp_busy(cp_busy_terminal), .cp_rnw(cp_rnw),
 219                 .cp_read(cp_read_terminal), .cp_write(cp_write)
 220 `ifdef verilator
 221 `else
 222                 , .sys_odata(sys_odata), .sys_tookdata(sys_tookdata), .sys_idata(sys_idata)
 223 `endif
 224                 );
 225
 226         Writeback writeback(
 227                 .clk(clk),
 228                 .inbubble(bubble_out_memory),
 229                 .write_reg(memory_out_write_reg), .write_num(memory_out_write_num), .write_data(memory_out_write_data),
 230                 .cpsr(memory_out_cpsr), .spsr(memory_out_spsr), .cpsrup(memory_out_cpsrup),
 231                 .regfile_write(regfile_write), .regfile_write_reg(regfile_write_reg), .regfile_write_data(regfile_write_data),
 232                 .outcpsr(writeback_out_cpsr), .outspsr(writeback_out_spsr),
 233                 .jmp(jmp_out_writeback), .jmppc(jmppc_out_writeback));
 234         assign writeback_out_backflush = jmp_out_writeback;
 235
 236         reg [31:0] clockno = 0;
 237         always @(posedge clk)
 238         begin
 239                 clockno <= clockno + 1;
 240                 $display("------------------------------------------------------------------------------");
 241                 $display("%3d: FETCH:            Bubble: %d, Instruction: %08x, PC: %08x", clockno, bubble_out_fetch, insn_out_fetch, pc_out_fetch);
 242                 $display("%3d: ISSUE:  Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x", clockno, stall_cause_issue, bubble_out_issue, insn_out_issue, pc_out_issue);
 243                 $display("%3d: DECODE:                      op0 %08x, op1 %08x, op2 %08x, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry);
 244                 $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_out_execute, jmppc_out_execute);
 245                 $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);
 246                 $display("%3d: WRITEB:                      CPSR %08x, SPSR %08x, Reg: %d [%08x -> %d], Jmp: %d [%08x]", clockno, writeback_out_cpsr, writeback_out_spsr, regfile_write, regfile_write_data, regfile_write_reg, jmp_out_writeback, jmppc_out_writeback);
 247         end
 248 endmodule