gpmc: squashed GPMC FIFO work for E100

The control and data slaves are now both implemented as FIFOs.
Requires another squash of E100 top level to use.

1 files changed, 5 insertions, 3 deletions

diff --git a/usrp2/gpmc/cross_clock_reader.v b/usrp2/gpmc/cross_clock_reader.v
index a8366badc..b4cdb79c5 100644
--- a/usrp2/gpmc/cross_clock_reader.v
+++ b/usrp2/gpmc/cross_clock_reader.v
@@ -27,18 +27,20 @@ module cross_clock_reader
     );
 
     reg [WIDTH-1:0] shadow0, shadow1;
+    reg [2:0] count;
 
     always @(posedge clk) begin
         if (rst) begin
             out <= DEFAULT;
             shadow0 <= DEFAULT;
             shadow1 <= DEFAULT;
+            count <= 0;
         end
-        else if (shadow0 == shadow1) begin
-            out <= shadow1;
-        end
+        else if (shadow0 == shadow1) count <= count + 1;
+        else count <= 0;
         shadow0 <= in;
         shadow1 <= shadow0;
+        if (count == 3'b111) out <= shadow1;
     end
 
 endmodule //cross_clock_reader