wishbone bridge now with minimal functionality. Need to check

timing and handle wait states.

1 files changed, 70 insertions, 0 deletions

diff --git a/usrp2/models/gpmc_model.v b/usrp2/models/gpmc_model.v
new file mode 100644
index 000000000..ce3acaacf
--- /dev/null
+++ b/usrp2/models/gpmc_model.v
@@ -0,0 +1,70 @@
+
+
+module gpmc_model
+  (output EM_CLK, inout [15:0] EM_D, output reg [10:1] EM_A, output reg [1:0] EM_NBE,
+   output reg EM_WAIT0, output reg EM_NCS4, output reg EM_NCS6, 
+   output reg EM_NWE, output reg EM_NOE );
+
+   assign EM_CLK = 0;
+   reg [15:0] EM_D_int;
+   assign EM_D = EM_D_int;
+   
+   initial
+     begin
+	EM_A <= 10'bz;
+	EM_NBE <= 2'b11;
+	EM_NWE <= 1;
+	EM_NOE <= 1;
+	EM_NCS4 <= 1;
+	EM_NCS6 <= 1;
+	EM_D_int <= 16'bz;
+ 	EM_WAIT0 <= 0;  // FIXME this is actually an input
+     end
+   
+   task GPMC_Write;
+      input [10:0] addr;
+      input [15:0] data;
+      begin
+	 #2;
+	 EM_A <= addr[10:1];
+	 EM_D_int <= data;
+	 #4;
+	 EM_NCS6 <= 0;
+	 #5;
+	 EM_NWE <= 0;
+	 #41;
+	 EM_NWE <= 1;
+	 EM_NCS6 <= 1;
+	 EM_A <= 10'bz;
+	 EM_D_int <= 16'bz;
+      end
+   endtask // GPMC_Write
+
+   task GPMC_Read;
+      input [10:0] addr;
+      begin
+	 #2;
+	 EM_A <= addr[10:1];
+	 #4;
+	 EM_NCS6 <= 0;
+	 #5;
+	 EM_NOE <= 0;
+	 #41;
+	 EM_NOE <= 1;
+	 EM_NCS6 <= 1;
+	 EM_A <= 10'bz;
+	 $display("Data Read from GPMC: %X",EM_D);
+      end
+   endtask // GPMC_Read
+   
+   initial
+     begin
+	#1000;
+	GPMC_Write(36,16'hBEEF);
+	#1000;
+	GPMC_Read(36);
+	#1000;
+	$finish;
+     end
+   
+endmodule // gpmc_model