gpif: squashed GPIF slave fifo work for B100

The control and data enpoints are now both implemented as FIFOs.
Requires another squash of B100 top level to use.

1 files changed, 54 insertions, 0 deletions

diff --git a/usrp2/gpif/fifo36_to_gpmc16.v b/usrp2/gpif/fifo36_to_gpmc16.v
new file mode 100644
index 000000000..508cd319c
--- /dev/null
+++ b/usrp2/gpif/fifo36_to_gpmc16.v
@@ -0,0 +1,54 @@
+//
+// Copyright 2012 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+module fifo36_to_gpmc16
+#(
+    parameter FIFO_SIZE = 9
+)
+(
+    //input fifo interface
+    input fifo_clk, input fifo_rst,
+    input [35:0] in_data,
+    input in_src_rdy,
+    output in_dst_rdy,
+
+    //output interface
+    input gpif_clk, input gpif_rst,
+    output [15:0] out_data,
+    output valid,
+    input enable,
+    output eof
+);
+
+    wire [35:0] data_int;
+    wire src_rdy_int, dst_rdy_int;
+
+    fifo_2clock_cascade #(.WIDTH(36), .SIZE(FIFO_SIZE)) fifo_2clk
+     (.wclk(fifo_clk), .datain(in_data), .src_rdy_i(in_src_rdy), .dst_rdy_o(in_dst_rdy), .space(),
+      .rclk(gpif_clk), .dataout(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int), .occupied(),
+      .arst(fifo_rst | gpif_rst));
+
+    wire [18:0] data18_int;
+    fifo36_to_fifo19 #(.LE(1)) f36_to_f19
+     (.clk(gpif_clk), .reset(gpif_rst), .clear(1'b0),
+      .f36_datain(data_int), .f36_src_rdy_i(src_rdy_int), .f36_dst_rdy_o(dst_rdy_int),
+      .f19_dataout(data18_int), .f19_src_rdy_o(valid), .f19_dst_rdy_i(enable) );
+
+    assign out_data = data18_int[15:0];
+    assign eof = data18_int[17];
+
+endmodule //fifo_to_gpmc16