//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// ////
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//// Copyright (C) 2015 Authors and OPENCORES.ORG ////
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//// Copyright (C) 2015 Authors and OPENCORES.ORG ////
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//// ////
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//// ////
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//// This source file may be used and distributed without ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// later version. ////
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//// ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// details. ////
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//// ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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module
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module
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riffa_chn_tx
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riffa_chn_tx
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#(
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#(
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N, // data bus width in bytes
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N // data bus width in bytes
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D = 2 // TX data fifo depth
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)
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)
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(
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(
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riffa_chnl_if chnl_in,
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riffa_chnl_if chnl_in,
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input tx_ready,
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input tx_ready,
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input tx_done,
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input tx_done,
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output reg [31:0] tx_index,
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output acked,
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output reg [30:0] tx_index,
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input tx_last,
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input tx_last,
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input [31:0] tx_len,
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input [31:0] tx_len,
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input [30:0] tx_off,
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input [30:0] tx_off,
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input clk,
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input clk,
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input reset
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input reset
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);
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);
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// --------------------------------------------------------------------
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// --------------------------------------------------------------------
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//
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//
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localparam RW = (N/4); // width of the bus in 32 bit words
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// --------------------------------------------------------------------
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//
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riffa_chnl_tx_fsm
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riffa_chnl_tx_fsm
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riffa_chnl_tx_fsm_i
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riffa_chnl_tx_fsm_i
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(
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(
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.tx(chnl_in.tx),
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.tx(chnl_in.tx),
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.tx_ack(chnl_in.tx_ack),
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.tx_ack(chnl_in.tx_ack),
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.*
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.*
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);
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);
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// --------------------------------------------------------------------
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// --------------------------------------------------------------------
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//
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//
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always_ff @(posedge clk)
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always_ff @(posedge clk)
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if(reset | ~chnl_in.tx)
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if(reset | ~chnl_in.tx | tx_done)
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tx_index = 0;
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tx_index = 0;
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else if(chnl_in.tx_data_valid & chnl_in.tx_data_ren)
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else if(chnl_in.tx_data_valid & chnl_in.tx_data_ren)
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tx_index <= tx_index + RW;
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tx_index <= tx_index + (N/4); // increment by 32 bit words
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// --------------------------------------------------------------------
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// --------------------------------------------------------------------
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//
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//
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endmodule
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endmodule
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