Only emit a stall if we didn't take a bubble in.

[firearm.git] / system.v

diff --git a/system.v b/system.v
index a653ea12bbc1145b4484f80528845e3bd03f0f23..e33bbff1ede9eb05cfc1741006ce28a35b9e7169 100644 (file)
--- a/system.v
+++ b/system.v
@@ -1,30 +1,87 @@
 `define BUS_ICACHE 0
 
 `define BUS_ICACHE 0
 

-module System();
+module System(input clk, output wire bubbleshield, output wire [31:0] insn, output wire [31:0] pc);

        wire [7:0] bus_req;
        wire [7:0] bus_ack;
        wire [31:0] bus_addr;
        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_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 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_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_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_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_in_fetch = stall_cause_issue;
+       wire stall_in_issue = 0;
+       
+       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;
+       
+       assign bubbleshield = bubble_out_issue;
+       assign insn = insn_out_issue;
+       assign pc = pc_out_issue;

 
        BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
 
        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_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));
                .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 /* 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 */),
+               .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 */),
+               .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
+               .inpc(pc_out_fetch), .cpsr(0 /* XXX */),
+               .outstall(stall_cause_issue), .outbubble(bubble_out_issue),
+               .outpc(pc_out_issue), .outinsn(insn_out_issue));

 endmodule
 endmodule