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diff --git a/fpga/usrp2/control_lib/atr_controller16.v b/fpga/usrp2/control_lib/atr_controller16.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/>.
-//
-
-
-// Automatic transmit/receive switching of control pins to daughterboards
-// Store everything in registers for now, but could use a RAM for more
-// complex state machines in the future
-
-module atr_controller16
- (input clk_i, input rst_i,
- input [5:0] adr_i, input [1:0] sel_i, input [15:0] dat_i, output [15:0] dat_o,
- input we_i, input stb_i, input cyc_i, output reg ack_o,
- input run_rx, input run_tx,
- output [31:0] ctrl_lines);
-
- reg [3:0] state;
- reg [31:0] atr_ram [0:15]; // DP distributed RAM
-
- wire [3:0] sel_int = { (sel_i[1] & adr_i[1]), (sel_i[0] & adr_i[1]),
- (sel_i[1] & ~adr_i[1]), (sel_i[0] & ~adr_i[1]) };
-
- // WB Interface
- always @(posedge clk_i)
- if(we_i & stb_i & cyc_i)
- begin
- if(sel_int[3])
- atr_ram[adr_i[5:2]][31:24] <= dat_i[15:8];
- if(sel_int[2])
- atr_ram[adr_i[5:2]][23:16] <= dat_i[7:0];
- if(sel_int[1])
- atr_ram[adr_i[5:2]][15:8] <= dat_i[15:8];
- if(sel_int[0])
- atr_ram[adr_i[5:2]][7:0] <= dat_i[7:0];
- end // if (we_i & stb_i & cyc_i)
-
- // Removing readback allows ram to be synthesized as LUTs instead of regs
- //always @(posedge clk_i)
- // dat_o <= adr_i[1] ? atr_ram[adr_i[5:2]][31:16] : atr_ram[adr_i[5:2]][15:0];
- assign dat_o = 16'd0;
-
- always @(posedge clk_i)
- ack_o <= stb_i & cyc_i & ~ack_o;
-
- // Control side of DP RAM
- assign ctrl_lines = atr_ram[state];
-
- // Put a more complex state machine with time delays and multiple states here
- // if daughterboard requires more complex sequencing
- localparam ATR_IDLE = 4'd0;
- localparam ATR_TX = 4'd1;
- localparam ATR_RX = 4'd2;
- localparam ATR_FULL_DUPLEX = 4'd3;
-
- always @(posedge clk_i)
- if(rst_i)
- state <= ATR_IDLE;
- else
- case ({run_rx,run_tx})
- 2'b00 : state <= ATR_IDLE;
- 2'b01 : state <= ATR_TX;
- 2'b10 : state <= ATR_RX;
- 2'b11 : state <= ATR_FULL_DUPLEX;
- endcase // case({run_rx,run_tx})
-
-endmodule // atr_controller16