// // Copyright 2011 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 medfifo #(parameter WIDTH=32, parameter DEPTH=1) (input clk, input rst, input [WIDTH-1:0] datain, output [WIDTH-1:0] dataout, input read, input write, input clear, output full, output empty, output [7:0] space, output [7:0] occupied); localparam NUM_FIFOS = (1<<DEPTH); wire [WIDTH-1:0] dout [0:NUM_FIFOS-1]; wire [0:NUM_FIFOS-1] full_x; wire [0:NUM_FIFOS-1] empty_x; shortfifo #(.WIDTH(WIDTH)) head (.clk(clk),.rst(rst), .datain(datain),.write(write),.full(full), .dataout(dout[0]),.read(~empty_x[0] & ~full_x[1]),.empty(empty_x[0]), .clear(clear),.space(space[4:0]),.occupied() ); shortfifo #(.WIDTH(WIDTH)) tail (.clk(clk),.rst(rst), .datain(dout[NUM_FIFOS-2]),.write(~empty_x[NUM_FIFOS-2] & ~full_x[NUM_FIFOS-1]),.full(full_x[NUM_FIFOS-1]), .dataout(dataout),.read(read),.empty(empty), .clear(clear),.space(),.occupied(occupied[4:0]) ); genvar i; generate for(i = 1; i < NUM_FIFOS-1 ; i = i + 1) begin : gen_depth shortfifo #(.WIDTH(WIDTH)) shortfifo (.clk(clk),.rst(rst), .datain(dout[i-1]),.write(~full_x[i] & ~empty_x[i-1]),.full(full_x[i]), .dataout(dout[i]),.read(~full_x[i+1] & ~empty_x[i]),.empty(empty_x[i]), .clear(clear),.space(),.occupied() ); end endgenerate assign space[7:5] = 0; assign occupied[7:5] = 0; endmodule // medfifo