`define BUS_ICACHE 0
+`define BUS_DCACHE 1
-module System(input clk, output wire bubbleshield, output wire [31:0] insn, output wire [31:0] pc);
+module System(input clk);
wire [7:0] bus_req;
wire [7:0] bus_ack;
wire [31:0] bus_addr;
wire bus_rd, bus_wr;
wire bus_ready;
- wire bus_req_icache;
- assign bus_req = {7'b0, bus_req_icache};
+ wire bus_req_icache;
+ wire bus_req_dcache;
+ assign bus_req = {6'b0, bus_req_dcache, bus_req_icache};
wire bus_ack_icache = bus_ack[`BUS_ICACHE];
+ wire bus_ack_dcache = bus_ack[`BUS_DCACHE];
wire [31:0] bus_addr_icache;
wire [31:0] bus_wdata_icache;
wire bus_rd_icache;
wire bus_wr_icache;
+ wire [31:0] bus_addr_dcache;
+ wire [31:0] bus_wdata_dcache;
+ wire bus_rd_dcache;
+ wire bus_wr_dcache;
+
wire [31:0] bus_rdata_blockram;
wire bus_ready_blockram;
- assign bus_addr = bus_addr_icache;
+ assign bus_addr = bus_addr_icache | bus_addr_dcache;
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_wdata = bus_wdata_icache | bus_wdata_dcache;
+ assign bus_rd = bus_rd_icache | bus_rd_dcache;
+ assign bus_wr = bus_wr_icache | bus_wr_dcache;
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_in_fetch = stall_cause_issue;
- wire stall_in_issue = 0;
+ wire [31:0] dcache_addr;
+ wire dcache_rd_req, dcache_wr_req;
+ wire dcache_rw_wait;
+ wire [31:0] dcache_wr_data, dcache_rd_data;
- wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2;
+ wire [31:0] decode_out_op0, decode_out_op1, decode_out_op2, decode_out_spsr, decode_out_cpsr;
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;
+ 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 regfile_write;
+ wire [3:0] regfile_write_reg;
+ wire [31:0] regfile_write_data;
+
+ 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] execute_out_cpsr, execute_out_spsr;
+
+ wire jmp_out_execute, jmp_out_writeback;
+ wire [31:0] jmppc_out_execute, jmppc_out_writeback;
+ wire jmp = jmp_out_execute | jmp_out_writeback;
+ wire [31:0] jmppc = jmppc_out_execute | jmppc_out_writeback;
+
+ wire memory_out_write_reg;
+ wire [3:0] memory_out_write_num;
+ wire [31:0] memory_out_write_data;
+ wire [31:0] memory_out_cpsr, memory_out_spsr;
+
+ wire [31:0] writeback_out_cpsr, writeback_out_spsr;
+
+ wire cp_ack_terminal;
+ wire cp_busy_terminal;
+ wire [31:0] cp_read_terminal;
+
+ wire cp_req;
+ wire [31:0] cp_insn;
+ wire cp_ack = cp_ack_terminal;
+ wire cp_busy = cp_busy_terminal;
+ wire cp_rnw;
+ wire [31:0] cp_read = cp_read_terminal;
+ wire [31:0] cp_write;
+
+ 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;
-
- assign bubbleshield = bubble_out_issue;
- assign insn = insn_out_issue;
- assign pc = pc_out_issue;
+ wire [31:0] pc_out_execute;
+ wire [31:0] pc_out_memory;
+
+ wire execute_out_backflush;
+ wire writeback_out_backflush;
BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
.bus_wdata(bus_wdata_icache), .bus_rd(bus_rd_icache),
.bus_wr(bus_wr_icache), .bus_ready(bus_ready));
+ DCache dcache(
+ .clk(clk),
+ .addr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
+ .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
+ .bus_req(bus_req_dcache), .bus_ack(bus_ack_dcache),
+ .bus_addr(bus_addr_dcache), .bus_rdata(bus_rdata),
+ .bus_wdata(bus_wdata_dcache), .bus_rd(bus_rd_dcache),
+ .bus_wr(bus_wr_dcache), .bus_ready(bus_ready));
+
BlockRAM blockram(
.clk(clk),
.bus_addr(bus_addr), .bus_rdata(bus_rdata_blockram),
Fetch fetch(
.clk(clk),
- .Nrst(1 /* XXX */),
+ .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_in_fetch), .jmp(0 /* XXX */), .jmppc(0 /* XXX */),
+ .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 /* XXX */),
- .stall(stall_in_issue), .flush(0 /* XXX */),
+ .Nrst(1'b1 /* XXX */),
+ .stall(stall_cause_execute), .flush(execute_out_backflush | writeback_out_backflush),
.inbubble(bubble_out_fetch), .insn(insn_out_fetch),
- .inpc(pc_out_fetch), .cpsr(0 /* XXX */),
+ .inpc(pc_out_fetch), .cpsr(writeback_out_cpsr),
.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),
- .write(0), .write_req(0), .write_data(0 /* XXX */));
+ .read_0(regfile_read_0), .read_1(regfile_read_1), .read_2(regfile_read_2), .read_3(regfile_read_3),
+ .rdata_0(regfile_rdata_0), .rdata_1(regfile_rdata_1), .rdata_2(regfile_rdata_2), .rdata_3(regfile_rdata_3),
+ .spsr(regfile_spsr),
+ .write(regfile_write), .write_reg(regfile_write_reg), .write_data(regfile_write_data));
Decode decode(
.clk(clk),
- .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(0 /* XXX */),
+ .stall(stall_cause_execute),
+ .insn(insn_out_fetch), .inpc(pc_out_fetch), .incpsr(writeback_out_cpsr), .inspsr(writeback_out_spsr),
.op0(decode_out_op0), .op1(decode_out_op1), .op2(decode_out_op2),
- .carry(decode_out_carry),
+ .carry(decode_out_carry), .outcpsr(decode_out_cpsr), .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(stall_cause_memory), .flush(writeback_out_backflush),
+ .inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
+ .cpsr(decode_out_cpsr), .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(bubble_out_execute),
+ .write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
+ .write_data(execute_out_write_data),
+ .jmp(jmp_out_execute), .jmppc(jmppc_out_execute),
+ .outpc(pc_out_execute), .outinsn(insn_out_execute),
+ .outop0(execute_out_op0), .outop1(execute_out_op1), .outop2(execute_out_op2),
+ .outcpsr(execute_out_cpsr), .outspsr(execute_out_spsr));
+ assign execute_out_backflush = jmp;
+
+ assign cp_insn = insn_out_execute;
+ Memory memory(
+ .clk(clk), .Nrst(1'b0),
+ /* stall? */ .flush(writeback_out_backflush),
+ .busaddr(dcache_addr), .rd_req(dcache_rd_req), .wr_req(dcache_wr_req),
+ .rw_wait(dcache_rw_wait), .wr_data(dcache_wr_data), .rd_data(dcache_rd_data),
+ .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),
+ .spsr(execute_out_spsr), .cpsr(execute_out_cpsr),
+ .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),
+ .cp_req(cp_req), .cp_ack(cp_ack), .cp_busy(cp_busy), .cp_rnw(cp_rnw), .cp_read(cp_read), .cp_write(cp_write),
+ .outcpsr(memory_out_cpsr), .outspsr(memory_out_spsr) /* XXX data_size */);
+
+ Terminal terminal(
+ .clk(clk),
+ .cp_req(cp_req), .cp_insn(cp_insn), .cp_ack(cp_ack_terminal), .cp_busy(cp_busy_terminal), .cp_rnw(cp_rnw),
+ .cp_read(cp_read_terminal), .cp_write(cp_write));
+
+ Writeback writeback(
+ .clk(clk),
+ .inbubble(bubble_out_memory),
+ .write_reg(memory_out_write_reg), .write_num(memory_out_write_num), .write_data(memory_out_write_data),
+ .cpsr(memory_out_cpsr), .spsr(memory_out_spsr),
+ .regfile_write(regfile_write), .regfile_write_reg(regfile_write_reg), .regfile_write_data(regfile_write_data),
+ .outcpsr(writeback_out_cpsr), .outspsr(writeback_out_spsr),
+ .jmp(jmp_out_writeback), .jmppc(jmppc_out_writeback));
+ assign writeback_out_backflush = jmp_out_writeback;
+
reg [31:0] clockno = 0;
always @(posedge clk)
begin
$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, 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);
+ $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);
+ $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);
end
endmodule
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