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authorMartin Braun <martin.braun@ettus.com>2014-10-07 11:25:20 +0200
committerMartin Braun <martin.braun@ettus.com>2014-10-07 11:25:20 +0200
commitfd3e84941de463fa1a7ebab0a69515b4bf2614cd (patch)
tree3fa721a13d41d2c0451d663a59a220a38fd5e614 /fpga/usrp2/fifo/fifo19_mux.v
parent3b66804e41891e358c790b453a7a59ec7462dba4 (diff)
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Removed copy of FPGA source files.
Diffstat (limited to 'fpga/usrp2/fifo/fifo19_mux.v')
-rw-r--r--fpga/usrp2/fifo/fifo19_mux.v94
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diff --git a/fpga/usrp2/fifo/fifo19_mux.v b/fpga/usrp2/fifo/fifo19_mux.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/>.
-//
-
-
-// Mux packets from multiple FIFO interfaces onto a single one.
-// Can alternate or give priority to one port (port 0)
-// In prio mode, port 1 will never get access if port 0 is always busy
-
-module fifo19_mux
- #(parameter prio = 0)
- (input clk, input reset, input clear,
- input [18:0] data0_i, input src0_rdy_i, output dst0_rdy_o,
- input [18:0] data1_i, input src1_rdy_i, output dst1_rdy_o,
- output [18:0] data_o, output src_rdy_o, input dst_rdy_i);
-
- wire [18:0] data0_int, data1_int;
- wire src0_rdy_int, dst0_rdy_int, src1_rdy_int, dst1_rdy_int;
-
- fifo_short #(.WIDTH(19)) mux_fifo_in0
- (.clk(clk), .reset(reset), .clear(clear),
- .datain(data0_i), .src_rdy_i(src0_rdy_i), .dst_rdy_o(dst0_rdy_o),
- .dataout(data0_int), .src_rdy_o(src0_rdy_int), .dst_rdy_i(dst0_rdy_int));
-
- fifo_short #(.WIDTH(19)) mux_fifo_in1
- (.clk(clk), .reset(reset), .clear(clear),
- .datain(data1_i), .src_rdy_i(src1_rdy_i), .dst_rdy_o(dst1_rdy_o),
- .dataout(data1_int), .src_rdy_o(src1_rdy_int), .dst_rdy_i(dst1_rdy_int));
-
- localparam MUX_IDLE0 = 0;
- localparam MUX_DATA0 = 1;
- localparam MUX_IDLE1 = 2;
- localparam MUX_DATA1 = 3;
-
- reg [1:0] state;
-
- wire eof0 = data0_int[17];
- wire eof1 = data1_int[17];
-
- wire [18:0] data_int;
- wire src_rdy_int, dst_rdy_int;
-
- always @(posedge clk)
- if(reset | clear)
- state <= MUX_IDLE0;
- else
- case(state)
- MUX_IDLE0 :
- if(src0_rdy_int)
- state <= MUX_DATA0;
- else if(src1_rdy_int)
- state <= MUX_DATA1;
-
- MUX_DATA0 :
- if(src0_rdy_int & dst_rdy_int & eof0)
- state <= prio ? MUX_IDLE0 : MUX_IDLE1;
-
- MUX_IDLE1 :
- if(src1_rdy_int)
- state <= MUX_DATA1;
- else if(src0_rdy_int)
- state <= MUX_DATA0;
-
- MUX_DATA1 :
- if(src1_rdy_int & dst_rdy_int & eof1)
- state <= MUX_IDLE0;
-
- default :
- state <= MUX_IDLE0;
- endcase // case (state)
-
- assign dst0_rdy_int = (state==MUX_DATA0) ? dst_rdy_int : 0;
- assign dst1_rdy_int = (state==MUX_DATA1) ? dst_rdy_int : 0;
- assign src_rdy_int = (state==MUX_DATA0) ? src0_rdy_int : (state==MUX_DATA1) ? src1_rdy_int : 0;
- assign data_int = (state==MUX_DATA0) ? data0_int : data1_int;
-
- fifo_short #(.WIDTH(19)) mux_fifo
- (.clk(clk), .reset(reset), .clear(clear),
- .datain(data_int), .src_rdy_i(src_rdy_int), .dst_rdy_o(dst_rdy_int),
- .dataout(data_o), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i));
-endmodule // fifo19_mux