[Commit-gnuradio] r9091 - usrp2/trunk/fpga/control_lib

[matt]

Author: matt
Date: 2008-07-31 20:15:00 -0600 (Thu, 31 Jul 2008)
New Revision: 9091

Modified:
   usrp2/trunk/fpga/control_lib/shortfifo.v
Log:
more accurate full/empty counts, which leads to it being 1 bit wider


Modified: usrp2/trunk/fpga/control_lib/shortfifo.v
===================================================================
--- usrp2/trunk/fpga/control_lib/shortfifo.v    2008-08-01 02:09:38 UTC (rev 
9090)
+++ usrp2/trunk/fpga/control_lib/shortfifo.v    2008-08-01 02:15:00 UTC (rev 
9091)
@@ -9,8 +9,8 @@
      input clear,
      output reg full,
      output reg empty,
-     output [3:0] space,
-     output [3:0] occupied);
+     output [4:0] space,
+     output [4:0] occupied);
    
    reg [3:0]     a;
    genvar        i;
@@ -57,7 +57,7 @@
 
    // NOTE will fail if you write into a full fifo or read from an empty one
 
-   assign space = full ? 0 : empty ? 15 : 15-a;
-   assign occupied = empty ? 0 : full ? 15 : a+1;
+   assign space = full ? 0 : empty ? 16 : 15-a;
+   assign occupied = empty ? 0 : full ? 16 : a+1;
    
 endmodule // shortfifo