add more ship files

[fleet.git] / src / edu / berkeley / fleet / slipway / icache.v

diff --git a/src/edu/berkeley/fleet/slipway/icache.v b/src/edu/berkeley/fleet/slipway/icache.v
index eb1ef48..280ded8 100644 (file)
--- a/src/edu/berkeley/fleet/slipway/icache.v
+++ b/src/edu/berkeley/fleet/slipway/icache.v
@@ -1,5 +1,5 @@
 `include "macros.v"
-`define BRAM_ADDR_WIDTH 8
+`define BRAM_ADDR_WIDTH 14
 `define BRAM_DATA_WIDTH `INSTRUCTION_WIDTH
 `define BRAM_NAME icache_bram
 `include "bram.inc"
@@ -28,11 +28,16 @@ module icache (clk,
   `defreg(dhorn_d_,                                     [(`PACKET_WIDTH-1):0],      dhorn_d)
 
   reg ihorn_full;
+  initial ihorn_full = 0;
   reg dhorn_full;
+  initial dhorn_full = 0;
   reg command_valid;
+  initial command_valid = 0;
 
   reg [(`BRAM_ADDR_WIDTH-1):0]    preload_pos;
   reg [(`BRAM_ADDR_WIDTH-1):0]    preload_size;
+  initial preload_size = 0;
+
   reg [(`BRAM_ADDR_WIDTH-1):0]    current_instruction_read_from;
   reg [(`BRAM_ADDR_WIDTH-1):0]    temp_base;
   reg [(`CODEBAG_SIZE_BITS-1):0]  temp_size;
@@ -53,18 +58,25 @@ module icache (clk,
   wire [(`BRAM_DATA_WIDTH-1):0]   ramread;
 
   reg command_valid_read;
+  initial command_valid_read = 0;
+
+  reg launched;
+  initial launched = 0;
+
+  icache_bram mybram(clk, write_flag, write_addr, current_instruction_read_from, write_data, not_connected, ramread);
 
   always @(posedge clk) begin
 
-    if (command_valid_read) begin
-      command_valid  <= 1;
-      command        <= ramread;
-    end
+    write_flag <= 0;
 
     if (!write_addr_r && write_addr_a) write_addr_a = 0;
     if (!write_data_r && write_data_a) write_data_a = 0;
 
-    if (send_done) begin
+    if (command_valid_read) begin
+      command_valid_read  <= 0;
+      command_valid       <= 1;
+
+    end else  if (send_done) begin
       `onwrite(write_done_r, write_done_a)
         send_done <= 0;
       end
@@ -73,11 +85,11 @@ module icache (clk,
       write_addr_a       = 1;
       write_data_a       = 1;
       send_done         <= 1;
-      write_flag         = 1;
-      write_addr         = write_addr_d;
-      write_data         = write_data_d;
+      write_flag        <= 1;
+      write_addr        <= write_addr_d;
+      write_data        <= write_data_d;
 
-    end else if (ihorn_full) begin
+    end else if (ihorn_full && launched) begin
       `onwrite(ihorn_r, ihorn_a)
         ihorn_full <= 0;
       end
@@ -89,6 +101,7 @@ module icache (clk,
 
     end else if (command_valid) begin
       command_valid <= 0;
+      command = ramread;
       case (command[(`INSTRUCTION_WIDTH-1):(`INSTRUCTION_WIDTH-2)])
         0: begin
             ihorn_full  <= 1;
@@ -117,9 +130,8 @@ module icache (clk,
       endcase
 
     end else if (cbd_pos < cbd_size) begin
-      command_valid                 <= 1;
-      current_instruction_read_from =  cbd_base+cbd_pos;
-      command                       <= ram[current_instruction_read_from];
+      current_instruction_read_from <= cbd_base+cbd_pos;
+      command_valid_read            <= 1;
       cbd_pos                       <= cbd_pos + 1;
 
     end else begin
@@ -132,10 +144,10 @@ module icache (clk,
         `onread(preload_r, preload_a)
           if (preload_size == 0) begin
             preload_size     <= preload_d;
-          end else begin
-            write_flag = 1;
-            write_data = preload_d;
-            write_addr = preload_pos;
+          end else if (!launched) begin
+            write_flag <= 1;
+            write_data <= preload_d;
+            write_addr <= preload_pos;
             if (preload_pos == 0) begin
               temp_base = preload_d[(`INSTRUCTION_WIDTH-(3+`DESTINATION_ADDRESS_BITS)):(`CODEBAG_SIZE_BITS)];
               temp_size = preload_d[(`CODEBAG_SIZE_BITS-1):0];
@@ -144,17 +156,13 @@ module icache (clk,
               cbd_pos  <= 0;
               cbd_base <= temp_base;
               cbd_size <= temp_size;
+              launched <= 1;
             end
             preload_pos      <= preload_pos + 1;
           end
         end
       end
     end
-
-    if (write_flag) begin
-      write_flag = 0;
-      ram[write_addr]  <= write_data;
-    end
   end
 endmodule