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-rw-r--r--usrp/fpga/sdr_lib/atr_delay.v83
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diff --git a/usrp/fpga/sdr_lib/atr_delay.v b/usrp/fpga/sdr_lib/atr_delay.v
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-// -*- verilog -*-
-//
-// USRP - Universal Software Radio Peripheral
-//
-// Copyright (C) 2007 Corgan Enterprises 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 2 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, write to the Free Software
-// Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA
-//
-
-module atr_delay(clk_i,rst_i,ena_i,tx_empty_i,tx_delay_i,rx_delay_i,atr_tx_o);
- input clk_i;
- input rst_i;
- input ena_i;
- input tx_empty_i;
- input [11:0] tx_delay_i;
- input [11:0] rx_delay_i;
- output atr_tx_o;
-
- reg [3:0] state;
- reg [11:0] count;
-
- `define ST_RX_DELAY 4'b0001
- `define ST_RX 4'b0010
- `define ST_TX_DELAY 4'b0100
- `define ST_TX 4'b1000
-
- always @(posedge clk_i)
- if (rst_i | ~ena_i)
- begin
- state <= `ST_RX;
- count <= 12'b0;
- end
- else
- case (state)
- `ST_RX:
- if (!tx_empty_i)
- begin
- state <= `ST_TX_DELAY;
- count <= tx_delay_i;
- end
-
- `ST_TX_DELAY:
- if (count == 0)
- state <= `ST_TX;
- else
- count <= count - 1;
-
- `ST_TX:
- if (tx_empty_i)
- begin
- state <= `ST_RX_DELAY;
- count <= rx_delay_i;
- end
-
- `ST_RX_DELAY:
- if (count == 0)
- state <= `ST_RX;
- else
- count <= count - 1;
-
- default: // Error
- begin
- state <= `ST_RX;
- count <= 0;
- end
- endcase
-
- assign atr_tx_o = (state == `ST_TX) | (state == `ST_RX_DELAY);
-
-endmodule // atr_delay
-