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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/usrp3/lib/xge/rtl/verilog/rx_dequeue.v
parent3b66804e41891e358c790b453a7a59ec7462dba4 (diff)
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Removed copy of FPGA source files.
Diffstat (limited to 'fpga/usrp3/lib/xge/rtl/verilog/rx_dequeue.v')
-rw-r--r--fpga/usrp3/lib/xge/rtl/verilog/rx_dequeue.v205
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diff --git a/fpga/usrp3/lib/xge/rtl/verilog/rx_dequeue.v b/fpga/usrp3/lib/xge/rtl/verilog/rx_dequeue.v
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-//////////////////////////////////////////////////////////////////////
-//// ////
-//// File name "rx_dequeue.v" ////
-//// ////
-//// This file is part of the "10GE MAC" project ////
-//// http://www.opencores.org/cores/xge_mac/ ////
-//// ////
-//// Author(s): ////
-//// - A. Tanguay (antanguay@opencores.org) ////
-//// ////
-//////////////////////////////////////////////////////////////////////
-//// ////
-//// Copyright (C) 2008 AUTHORS. All rights reserved. ////
-//// ////
-//// This source file may be used and distributed without ////
-//// restriction provided that this copyright statement is not ////
-//// removed from the file and that any derivative work contains ////
-//// the original copyright notice and the associated disclaimer. ////
-//// ////
-//// This source file is free software; you can redistribute it ////
-//// and/or modify it under the terms of the GNU Lesser General ////
-//// Public License as published by the Free Software Foundation; ////
-//// either version 2.1 of the License, or (at your option) any ////
-//// later version. ////
-//// ////
-//// This source 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 Lesser General Public License for more ////
-//// details. ////
-//// ////
-//// You should have received a copy of the GNU Lesser General ////
-//// Public License along with this source; if not, download it ////
-//// from http://www.opencores.org/lgpl.shtml ////
-//// ////
-//////////////////////////////////////////////////////////////////////
-
-
-`include "defines.v"
-
-module rx_dequeue(/*AUTOARG*/
- // Outputs
- rxdfifo_ren, pkt_rx_data, pkt_rx_val, pkt_rx_sop, pkt_rx_eop,
- pkt_rx_err, pkt_rx_mod, pkt_rx_avail, status_rxdfifo_udflow_tog,
- // Inputs
- clk_156m25, reset_156m25_n, rxdfifo_rdata, rxdfifo_rstatus,
- rxdfifo_rempty, rxdfifo_ralmost_empty, pkt_rx_ren
- );
-
-input clk_156m25;
-input reset_156m25_n;
-
-input [63:0] rxdfifo_rdata;
-input [7:0] rxdfifo_rstatus;
-input rxdfifo_rempty;
-input rxdfifo_ralmost_empty;
-
-input pkt_rx_ren;
-
-output rxdfifo_ren;
-
-output [63:0] pkt_rx_data;
-output pkt_rx_val;
-output pkt_rx_sop;
-output pkt_rx_eop;
-output pkt_rx_err;
-output [2:0] pkt_rx_mod;
-output pkt_rx_avail;
-
-output status_rxdfifo_udflow_tog;
-
-/*AUTOREG*/
-// Beginning of automatic regs (for this module's undeclared outputs)
-reg pkt_rx_avail;
-reg [63:0] pkt_rx_data;
-reg pkt_rx_eop;
-reg pkt_rx_err;
-reg [2:0] pkt_rx_mod;
-reg pkt_rx_sop;
-reg pkt_rx_val;
-reg status_rxdfifo_udflow_tog;
-// End of automatics
-
-reg end_eop;
-
-/*AUTOWIRE*/
-
-
-// End eop to force one cycle between packets
-
-assign rxdfifo_ren = !rxdfifo_rempty && pkt_rx_ren && !end_eop;
-
-
-
-always @(posedge clk_156m25 or negedge reset_156m25_n) begin
-
- if (reset_156m25_n == 1'b0) begin
-
- pkt_rx_avail <= 1'b0;
-
- pkt_rx_data <= 64'b0;
- pkt_rx_sop <= 1'b0;
- pkt_rx_eop <= 1'b0;
- pkt_rx_err <= 1'b0;
- pkt_rx_mod <= 3'b0;
-
- pkt_rx_val <= 1'b0;
-
- end_eop <= 1'b0;
-
- status_rxdfifo_udflow_tog <= 1'b0;
-
- end
- else begin
-
- pkt_rx_avail <= !rxdfifo_ralmost_empty;
-
-
-
- // If eop shows up at the output of the fifo, we drive eop on
- // the bus on the next read. This will be the last read for this
- // packet. The fifo is designed to output data early. On last read,
- // data from next packet will appear at the output of fifo. Modulus
- // of packet length is in lower bits.
-
- pkt_rx_eop <= rxdfifo_ren && rxdfifo_rstatus[`RXSTATUS_EOP];
- pkt_rx_mod <= {3{rxdfifo_ren & rxdfifo_rstatus[`RXSTATUS_EOP]}} & rxdfifo_rstatus[2:0];
-
-
- pkt_rx_val <= rxdfifo_ren;
-
- if (rxdfifo_ren) begin
-
- `ifdef BIGENDIAN
- pkt_rx_data <= {rxdfifo_rdata[7:0],
- rxdfifo_rdata[15:8],
- rxdfifo_rdata[23:16],
- rxdfifo_rdata[31:24],
- rxdfifo_rdata[39:32],
- rxdfifo_rdata[47:40],
- rxdfifo_rdata[55:48],
- rxdfifo_rdata[63:56]};
- `else
- pkt_rx_data <= rxdfifo_rdata;
- `endif
-
- end
-
-
- if (rxdfifo_ren && rxdfifo_rstatus[`RXSTATUS_SOP]) begin
-
- // SOP indication on first word
-
- pkt_rx_sop <= 1'b1;
- pkt_rx_err <= 1'b0;
-
- end
- else begin
-
- pkt_rx_sop <= 1'b0;
-
-
- // Give an error if FIFO is to underflow
-
- if (rxdfifo_rempty && pkt_rx_ren && !end_eop) begin
- pkt_rx_val <= 1'b1;
- pkt_rx_eop <= 1'b1;
- pkt_rx_err <= 1'b1;
- end
-
- end
-
-
- if (rxdfifo_ren && |(rxdfifo_rstatus[`RXSTATUS_ERR])) begin
-
- // Status stored in FIFO is propagated to error signal.
-
- pkt_rx_err <= 1'b1;
-
- end
-
-
- //---
- // EOP indication at the end of the frame. Cleared otherwise.
-
- if (rxdfifo_ren && rxdfifo_rstatus[`RXSTATUS_EOP]) begin
- end_eop <= 1'b1;
- end
- else if (pkt_rx_ren) begin
- end_eop <= 1'b0;
- end
-
-
-
- //---
- // FIFO errors, used to generate interrupts
-
- if (rxdfifo_rempty && pkt_rx_ren && !end_eop) begin
- status_rxdfifo_udflow_tog <= ~status_rxdfifo_udflow_tog;
- end
-
- end
-end
-
-endmodule