1// 2// Copyright 2012 Ettus Research LLC 3// 4// This program is free software: you can redistribute it and/or modify 5// it under the terms of the GNU General Public License as published by 6// the Free Software Foundation, either version 3 of the License, or 7// (at your option) any later version. 8// 9// This program is distributed in the hope that it will be useful, 10// but WITHOUT ANY WARRANTY; without even the implied warranty of 11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12// GNU General Public License for more details. 13// 14// You should have received a copy of the GNU General Public License 15// along with this program. If not, see <http://www.gnu.org/licenses/>. 16// 17 18module gpmc16_to_fifo36 19#( 20 parameter FIFO_SIZE = 9, 21 22 //not ready until minimum xfers of space available 23 parameter MIN_SPACE16 = 128 24) 25( 26 //input interface 27 input gpif_clk, input gpif_rst, 28 input [15:0] in_data, 29 input valid, 30 output reg ready, 31 32 //output fifo interface 33 input fifo_clk, input fifo_rst, 34 output [35:0] out_data, 35 output out_src_rdy, 36 input out_dst_rdy 37); 38 39 wire [35:0] data_int; 40 wire src_rdy_int, dst_rdy_int; 41 wire [18:0] refr_data; 42 wire refr_src_rdy, refr_dst_rdy; 43 44 wire [15:0] fifo_space; 45 46 always @(posedge gpif_clk) 47 ready <= (fifo_space >= MIN_SPACE16/2); 48 49 packet_reframer packet_reframer 50 (.clk(gpif_clk), .reset(gpif_rst), .clear(1'b0), 51 .data_i(in_data), .src_rdy_i(valid), .dst_rdy_o(), 52 .data_o(refr_data), .src_rdy_o(refr_src_rdy), .dst_rdy_i(refr_dst_rdy)); 53 54 fifo19_to_fifo36 #(.LE(1)) f19_to_f36 55 (.clk(gpif_clk), .reset(gpif_rst), .clear(1'b0), 56 .f19_datain(refr_data), .f19_src_rdy_i(refr_src_rdy), .f19_dst_rdy_o(refr_dst_rdy), 57 .f36_dataout(data_int), .f36_src_rdy_o(src_rdy_int), .f36_dst_rdy_i(dst_rdy_int)); 58 59 fifo_2clock_cascade #(.WIDTH(36), .SIZE(FIFO_SIZE)) fifo_2clk 60 (.wclk(gpif_clk), .datain(data_int), .src_rdy_i(src_rdy_int), .dst_rdy_o(dst_rdy_int), .space(fifo_space), 61 .rclk(fifo_clk), .dataout(out_data), .src_rdy_o(out_src_rdy), .dst_rdy_i(out_dst_rdy), .occupied(), 62 .arst(fifo_rst | gpif_rst)); 63 64endmodule //fifo_to_gpmc16 65