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-rw-r--r--fpga/usrp2/control_lib/medfifo.v66
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diff --git a/fpga/usrp2/control_lib/medfifo.v b/fpga/usrp2/control_lib/medfifo.v
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--- a/fpga/usrp2/control_lib/medfifo.v
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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