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//
// 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
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