gpif skeletons

1 files changed, 47 insertions, 0 deletions

diff --git a/usrp2/gpif/gpif_wr.v b/usrp2/gpif/gpif_wr.v
new file mode 100644
index 000000000..c5cdc7597
--- /dev/null
+++ b/usrp2/gpif/gpif_wr.v
@@ -0,0 +1,47 @@
+
+module gpif_wr
+  (input gpif_clk, input gpif_rst,
+   input [15:0] gpif_data, input WR,
+   output reg have_space,
+
+   input sys_clk, input sys_rst,
+   output [19:0] data_o, output src_rdy_o, input dst_rdy_i,
+   output [31:0] debug );
+
+   reg 		 wr_reg;
+   reg [15:0] 	 gpif_data_reg;
+   
+   always @(posedge gpif_clk)
+     begin
+	wr_reg <= WR;
+	gpif_data_reg <= gpif_data;
+     end
+
+   reg [9:0] write_count;
+   
+   always @(posedge gpif_clk)
+     if(gpif_rst)
+       write_count <= 0;
+     else if(wr_reg)
+       write_count <= write_count + 1;
+     else
+       write_count <= 0;
+
+   reg 	     sop;
+   wire      occ = 0;
+   wire      eop = (write_count == 255);
+   
+   always @(posedge gpif_clk)
+     sop <= WR & ~wr_reg;
+
+   wire [15:0] fifo_space;
+   always @(posedge gpif_clk)
+     have_space <= fifo_space > 256;
+   		  
+   fifo_2clock_cascade #(.WIDTH(19), .SIZE(9)) wr_fifo
+     (.wclk(gpif_clk), .datain({occ,eop,sop,gpif_data_reg}),
+      .src_rdy_i(wr_reg & ~write_count[8]), .dst_rdy_o(), .space(fifo_space),
+      .rclk(sys_clk), .dataout(data_o), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i), .occupied(),
+      .arst(sys_rst));
+   
+endmodule // gpif_wr