Fix a few scattered bugs, and get fetch to work.

[firearm.git] / system.v

diff --git a/system.v b/system.v
index a653ea12bbc1145b4484f80528845e3bd03f0f23..0c25de3a9e3f28b6fb13212fb16fc762cf5ba39e 100644 (file)
--- a/system.v
+++ b/system.v
@@ -1,30 +1,62 @@
 `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 [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;
 
        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 /* XXX */),
+               .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
+               .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
+               .stall(0 /* XXX */), .jmp(0 /* XXX */), .jmppc(0 /* XXX */),
+               .bubble(bubbleshield), .insn(insn), .pc(pc));
+
 endmodule