[Commit-gnuradio] r6362 - gnuradio/branches/developers/matt/u2f/control_lib

[matt]

Author: matt
Date: 2007-09-08 00:21:24 -0600 (Sat, 08 Sep 2007)
New Revision: 6362

Modified:
   gnuradio/branches/developers/matt/u2f/control_lib/shortfifo.v
Log:
all outputs now registered


Modified: gnuradio/branches/developers/matt/u2f/control_lib/shortfifo.v
===================================================================
--- gnuradio/branches/developers/matt/u2f/control_lib/shortfifo.v       
2007-09-08 05:47:35 UTC (rev 6361)
+++ gnuradio/branches/developers/matt/u2f/control_lib/shortfifo.v       
2007-09-08 06:21:24 UTC (rev 6362)
@@ -6,7 +6,7 @@
      output [WIDTH-1:0] dataout,
      input read,
      input write,
-     output full,
+     output reg full,
      output reg empty);
    
    reg [3:0] a;
@@ -27,18 +27,27 @@
        begin
          a <= 0;
          empty <= 1;
+         full <= 0;
        end
      else if(read & ~write)
-       if(a==0)
-        empty <= 1;
-       else
-        a <= a - 1;
+       begin
+         full <= 0;
+         if(a==0)
+           empty <= 1;
+         else
+           a <= a - 1;
+       end
      else if(write & ~read)
-       if(empty)
-        empty <= 0;
-       else
-        a <= a + 1;
-   
-   assign full = (a == 15);
-   // FIXME will wrap if you write into a full fifo
+       begin
+         empty <= 0;
+         if(~empty)
+           a <= a + 1;
+         if(a == 14)
+           full <= 1;
+       end
+
+   //   assign full = (a == 15);
+
+   // NOTE will fail if you write into a full fifo or read from an empty one
+
 endmodule // shortfifo