`define BUS_ICACHE 0
-module System();
+module System(input clk);
wire [7:0] bus_req;
wire [7:0] bus_ack;
wire [31:0] bus_addr;
- wire [31:0] bus_data;
+ wire [31:0] bus_rdata;
+ wire [31:0] bus_wdata;
wire bus_rd, bus_wr;
wire bus_ready;
-
- wire bus_req_icache = bus_req[`BUS_ICACHE];
+
+ wire bus_req_icache;
+ assign bus_req = {7'b0, bus_req_icache};
wire bus_ack_icache = bus_ack[`BUS_ICACHE];
+
wire [31:0] bus_addr_icache;
wire [31:0] bus_wdata_icache;
wire bus_rd_icache;
wire bus_wr_icache;
+ wire [31:0] bus_rdata_blockram;
+ wire bus_ready_blockram;
+
assign bus_addr = bus_addr_icache;
- assign bus_data = bus_wdata_icache;
+ assign bus_rdata = bus_rdata_blockram;
+ assign bus_wdata = bus_wdata_icache;
assign bus_rd = bus_rd_icache;
assign bus_wr = bus_wr_icache;
+ assign bus_ready = bus_ready_blockram;
+
+ wire [31:0] icache_rd_addr;
+ wire icache_rd_req;
+ wire icache_rd_wait;
+ wire [31:0] icache_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 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 [31:0] jmppc;
+ wire jmp;
+
+ wire bubble_out_fetch;
+ wire bubble_out_issue;
+ wire [31:0] insn_out_fetch;
+ wire [31:0] insn_out_issue;
+ wire [31:0] pc_out_fetch;
+ wire [31:0] pc_out_issue;
+
+ wire execute_outflush = jmp;
+ wire issue_flush = execute_outflush;
+ wire execute_flush = 1'b0;
BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
- ICache(
- .rd_addr(), .rd_req(), .rd_wait(), .rd_data(),
+
+ ICache icache(
+ .clk(clk),
+ /* XXX reset? */
+ .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
+ .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
.bus_req(bus_req_icache), .bus_ack(bus_ack_icache),
- .bus_addr(bus_addr_icache), .bus_rdata(bus_data),
+ .bus_addr(bus_addr_icache), .bus_rdata(bus_rdata),
.bus_wdata(bus_wdata_icache), .bus_rd(bus_rd_icache),
.bus_wr(bus_wr_icache), .bus_ready(bus_ready));
+
+ BlockRAM blockram(
+ .clk(clk),
+ .bus_addr(bus_addr), .bus_rdata(bus_rdata_blockram),
+ .bus_wdata(bus_wdata), .bus_rd(bus_rd), .bus_wr(bus_wr),
+ .bus_ready(bus_ready_blockram));
+
+ Fetch fetch(
+ .clk(clk),
+ .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_cause_issue), .jmp(jmp), .jmppc(jmppc),
+ .bubble(bubble_out_fetch), .insn(insn_out_fetch),
+ .pc(pc_out_fetch));
+
+ Issue issue(
+ .clk(clk),
+ .Nrst(1'b1 /* XXX */),
+ .stall(stall_cause_execute), .flush(issue_flush),
+ .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
+ .inpc(pc_out_fetch), .cpsr(32'b0 /* XXX */),
+ .outstall(stall_cause_issue), .outbubble(bubble_out_issue),
+ .outpc(pc_out_issue), .outinsn(insn_out_issue));
+
+ 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),
+ .spsr(regfile_spsr), .write(4'b0), .write_req(1'b0), .write_data(10 /* XXX */));
+
+ Decode decode(
+ .clk(clk),
+ .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(32'b0 /* XXX */), .inspsr(regfile_spsr),
+ .op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
+ .carry(decode_out_carry), .outspsr(decode_out_spsr),
+ .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(execute_flush),
+ .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),
+ .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),
+ .jmppc(jmppc),
+ .jmp(jmp));
+
+ reg [31:0] clockno = 0;
+ always @(posedge clk)
+ begin
+ clockno <= clockno + 1;
+ $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, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry);
+ $display("%3d: EXEC: Stall: %d, Bubble: %d, Reg: %d, [%08x -> %d], Jmp: %d [%08x]", clockno, stall_cause_execute, execute_out_bubble, execute_out_write_reg, execute_out_write_data, execute_out_write_num, jmp, jmppc);
+ end
endmodule
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