Fetch, ICache: Autoize ICache/Fetch interface, and rename with more stylish names.

[firearm.git] / ICache.v

diff --git a/ICache.v b/ICache.v
index 8b9eac34f5c5a8e62be1c117d6eaec173070a9b6..2533671389de2751953d2bb2a364b0366be67c3e 100644 (file)
--- a/ICache.v
+++ b/ICache.v
@@ -4,10 +4,10 @@ module ICache(
        input clk,
        
        /* ARM core interface */
-       input [31:0] rd_addr,
-       input rd_req,
-       output reg rd_wait,
-       output reg [31:0] rd_data,
+       input       [31:0] ic__rd_addr_0a,
+       input              ic__rd_req_0a,
+       output wire        ic__rd_wait_0a,
+       output wire [31:0] ic__rd_data_0a,
        
        /* bus interface */
        output wire bus_req,
@@ -22,6 +22,15 @@ module ICache(
        assign bus_wr = 0;
        assign bus_wdata = 0;
        
+       wire [31:0] rd_addr_0a;
+       wire        rd_req_0a;
+       reg         rd_wait_0a;
+       reg  [31:0] rd_data_0a;
+       assign ic__rd_wait_0a = rd_wait_0a;
+       assign ic__rd_data_0a = rd_data_0a;
+       assign rd_addr_0a = ic__rd_addr_0a;
+       assign rd_req_0a = ic__rd_req_0a;
+       
        /* [31 tag 10] [9 cache index 6] [5 data index 0]
         * so the data index is 6 bits long
         * so the cache index is 4 bits long
@@ -40,20 +49,20 @@ module ICache(
                        cache_tags[i[3:0]] = 0;
                end
        
-       wire [5:0] rd_didx = rd_addr[5:0];
+       wire [5:0] rd_didx = rd_addr_0a[5:0];
        wire [3:0] rd_didx_word = rd_didx[5:2];
-       wire [3:0] rd_idx = rd_addr[9:6];
-       wire [21:0] rd_tag = rd_addr[31:10];
+       wire [3:0] rd_idx = rd_addr_0a[9:6];
+       wire [21:0] rd_tag = rd_addr_0a[31:10];
        
        reg [31:0] prev_rd_addr = 32'hFFFFFFFF;
        
        wire cache_hit = cache_valid[rd_idx] && (cache_tags[rd_idx] == rd_tag);
        
        reg [3:0] cache_fill_pos = 0;
-       assign bus_req = rd_req && !cache_hit; /* xxx, needed for Verilator */
+       assign bus_req = rd_req_0a && !cache_hit; /* xxx, needed for Verilator */
        always @(*)
-               if (rd_req && !cache_hit && bus_ack) begin
-                       bus_addr = {rd_addr[31:6], cache_fill_pos[3:0], 2'b00 /* reads are 32-bits */};
+               if (rd_req_0a && !cache_hit && bus_ack) begin
+                       bus_addr = {rd_addr_0a[31:6], cache_fill_pos[3:0], 2'b00 /* reads are 32-bits */};
                        bus_rd = 1;
                end else begin
                        bus_addr = 0;
@@ -62,16 +71,16 @@ module ICache(
 
        wire [31:0] curdata = cache_data[{rd_idx,rd_didx_word}];
        always @(*) begin
-               rd_wait = rd_req && !cache_hit;
-               rd_data = curdata;
+               rd_wait_0a = rd_req_0a && !cache_hit;
+               rd_data_0a = curdata;
        end
        
        always @(posedge clk) begin
-               prev_rd_addr <= {rd_addr[31:6], 6'b0};
-               if (cache_fill_pos != 0 && ((prev_rd_addr != {rd_addr[31:6], 6'b0}) || cache_hit))      /* If this wasn't from the same line, or we've moved on somehow, reset the fill circuitry. */
+               prev_rd_addr <= {rd_addr_0a[31:6], 6'b0};
+               if (cache_fill_pos != 0 && ((prev_rd_addr != {rd_addr_0a[31:6], 6'b0}) || cache_hit))   /* If this wasn't from the same line, or we've moved on somehow, reset the fill circuitry. */
                        cache_fill_pos <= 0;
-               else if (rd_req && !cache_hit && bus_ack && bus_ready) begin
-                       $display("ICACHE: FILL: rd addr %08x; bus addr %08x; bus data %08x", rd_addr, bus_addr, bus_rdata);
+               else if (rd_req_0a && !cache_hit && bus_ack && bus_ready) begin
+                       $display("ICACHE: FILL: rd addr %08x; bus addr %08x; bus data %08x", rd_addr_0a, bus_addr, bus_rdata);
                        cache_data[{rd_idx,cache_fill_pos}] <= bus_rdata;
                        cache_fill_pos <= cache_fill_pos + 1;
                        if (cache_fill_pos == 15) begin /* Done? */