1 files changed, 81 insertions, 0 deletions
diff --git a/fpga/usrp1/models/fifo_1c_1k.v b/fpga/usrp1/models/fifo_1c_1k.v
new file mode 100644
index 000000000..d11040b54
--- /dev/null
+++ b/fpga/usrp1/models/fifo_1c_1k.v
@@ -0,0 +1,81 @@
+// Model of FIFO in Altera
+
+module fifo_1c_1k ( data, wrreq, rdreq, rdclk, wrclk, aclr, q,
+		    rdfull, rdempty, rdusedw, wrfull, wrempty, wrusedw);
+
+   parameter width = 32;
+   parameter depth = 1024;
+   //`define rd_req 0;  // Set this to 0 for rd_ack, 1 for rd_req
+      
+   input [31:0] data;
+   input 	wrreq;
+   input 	rdreq;
+   input 	rdclk;
+   input 	wrclk;
+   input 	aclr;
+   output [31:0] q;
+   output 	 rdfull;
+   output 	 rdempty;
+   output [9:0]  rdusedw;
+   output 	 wrfull;
+   output 	 wrempty;
+   output [9:0]  wrusedw;
+   
+   reg [width-1:0] mem [0:depth-1];
+   reg [7:0] 	   rdptr;
+   reg [7:0] 	   wrptr;
+   
+`ifdef rd_req
+   reg [width-1:0] q;
+`else
+   wire [width-1:0] q;
+`endif
+   
+   reg [9:0] 	    rdusedw;
+   reg [9:0] 	    wrusedw;
+   
+   integer 	    i;
+
+   always @( aclr)
+     begin
+	wrptr <= #1 0;
+	rdptr <= #1 0;
+	for(i=0;i<depth;i=i+1)
+	  mem[i] <= #1 0;
+     end
+   
+   always @(posedge wrclk)
+     if(wrreq)
+       begin
+	  wrptr <= #1 wrptr+1;
+	  mem[wrptr] <= #1 data;
+       end
+   
+   always @(posedge rdclk)
+     if(rdreq)
+       begin
+   	  rdptr <= #1 rdptr+1;
+`ifdef rd_req
+	  q <= #1 mem[rdptr];
+`endif
+       end
+   
+`ifdef rd_req
+`else
+   assign q = mem[rdptr];
+`endif
+   
+   // Fix these
+   always @(posedge wrclk)
+     wrusedw <= #1 wrptr - rdptr;
+   
+   always @(posedge rdclk)
+     rdusedw <= #1 wrptr - rdptr;
+
+   assign wrempty = (wrusedw == 0);
+   assign wrfull = (wrusedw == depth-1);
+
+   assign rdempty = (rdusedw == 0);
+   assign rdfull = (rdusedw == depth-1);
+   
+endmodule // fifo_1c_1k