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csantifort |
//////////////////////////////////////////////////////////////////
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// //
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// Ethmac module Wishbone bus width and endian switch //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// Arbitrates between two wishbone masters and 13 wishbone //
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// slave modules. The ethernet MAC wishbone master is given //
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// priority over the Amber core. //
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// //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2010 Authors and OPENCORES.ORG //
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// //
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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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// 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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// //
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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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// 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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// later version. //
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// //
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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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// 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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// details. //
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// //
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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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// from http://www.opencores.org/lgpl.shtml //
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// //
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//////////////////////////////////////////////////////////////////
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module ethmac_wb #(
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parameter WB_DWIDTH = 32,
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parameter WB_SWIDTH = 4
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)(
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// Ethmac side
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input [31:0] i_m_wb_adr,
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input [3:0] i_m_wb_sel,
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input i_m_wb_we,
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output [31:0] o_m_wb_rdat,
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input [31:0] i_m_wb_wdat,
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input i_m_wb_cyc,
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input i_m_wb_stb,
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output o_m_wb_ack,
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output o_m_wb_err,
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// Wishbone arbiter side
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output [31:0] o_m_wb_adr,
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output [WB_SWIDTH-1:0] o_m_wb_sel,
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output o_m_wb_we,
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input [WB_DWIDTH-1:0] i_m_wb_rdat,
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output [WB_DWIDTH-1:0] o_m_wb_wdat,
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output o_m_wb_cyc,
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output o_m_wb_stb,
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input i_m_wb_ack,
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input i_m_wb_err,
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// Wishbone arbiter side
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input [31:0] i_s_wb_adr,
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input [WB_SWIDTH-1:0] i_s_wb_sel,
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input i_s_wb_we,
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output [WB_DWIDTH-1:0] o_s_wb_rdat,
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input [WB_DWIDTH-1:0] i_s_wb_wdat,
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input i_s_wb_cyc,
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input i_s_wb_stb,
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output o_s_wb_ack,
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output o_s_wb_err,
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// Ethmac side
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output [31:0] o_s_wb_adr,
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output [3:0] o_s_wb_sel,
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output o_s_wb_we,
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input [31:0] i_s_wb_rdat,
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output [31:0] o_s_wb_wdat,
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output o_s_wb_cyc,
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output o_s_wb_stb,
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input i_s_wb_ack,
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input i_s_wb_err
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);
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`include "system_functions.v"
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// =========================
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// Master interface - with endian conversion
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// =========================
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generate
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if (WB_DWIDTH == 128)
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begin : wbm128
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assign o_m_wb_rdat = i_m_wb_adr[3:2] == 2'd3 ? endian_x32(i_m_wb_rdat[127:96]) :
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i_m_wb_adr[3:2] == 2'd2 ? endian_x32(i_m_wb_rdat[ 95:64]) :
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i_m_wb_adr[3:2] == 2'd1 ? endian_x32(i_m_wb_rdat[ 63:32]) :
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endian_x32(i_m_wb_rdat[ 31: 0]) ;
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assign o_m_wb_sel = i_m_wb_adr[3:2] == 2'd3 ? { endian_x4(i_m_wb_sel), 12'd0} :
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i_m_wb_adr[3:2] == 2'd2 ? { 4'd0, endian_x4(i_m_wb_sel), 8'd0} :
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i_m_wb_adr[3:2] == 2'd1 ? { 8'd0, endian_x4(i_m_wb_sel), 4'd0} :
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{12'd0, endian_x4(i_m_wb_sel) } ;
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assign o_m_wb_wdat = i_m_wb_adr[3:2] == 2'd3 ? { endian_x32(i_m_wb_wdat), 96'd0} :
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i_m_wb_adr[3:2] == 2'd2 ? {32'd0, endian_x32(i_m_wb_wdat), 64'd0} :
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i_m_wb_adr[3:2] == 2'd1 ? {64'd0, endian_x32(i_m_wb_wdat), 32'd0} :
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{96'd0, endian_x32(i_m_wb_wdat) } ;
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end
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else
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begin : wbm32
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assign o_m_wb_rdat = endian_x32(i_m_wb_rdat);
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assign o_m_wb_sel = endian_x4 (i_m_wb_sel);
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assign o_m_wb_wdat = endian_x32(i_m_wb_wdat);
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end
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endgenerate
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assign o_m_wb_ack = i_m_wb_ack;
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assign o_m_wb_err = i_m_wb_err;
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assign o_m_wb_adr = i_m_wb_adr;
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assign o_m_wb_we = i_m_wb_we ;
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assign o_m_wb_cyc = i_m_wb_cyc;
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assign o_m_wb_stb = i_m_wb_stb;
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// =========================
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// Slave interface - no endian conversion
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// =========================
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generate
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if (WB_DWIDTH == 128)
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begin : wbs128
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assign o_s_wb_wdat = i_s_wb_adr[3:2] == 2'd3 ? i_s_wb_wdat[127:96] :
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i_s_wb_adr[3:2] == 2'd2 ? i_s_wb_wdat[ 95:64] :
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i_s_wb_adr[3:2] == 2'd1 ? i_s_wb_wdat[ 63:32] :
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i_s_wb_wdat[ 31: 0] ;
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assign o_s_wb_sel = i_s_wb_adr[3:2] == 2'd3 ? i_s_wb_sel[15:12] :
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i_s_wb_adr[3:2] == 2'd2 ? i_s_wb_sel[11: 8] :
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i_s_wb_adr[3:2] == 2'd1 ? i_s_wb_sel[ 7: 4] :
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i_s_wb_sel[ 3: 0] ;
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assign o_s_wb_rdat = i_s_wb_adr[3:2] == 2'd3 ? { i_s_wb_rdat, 96'd0} :
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i_s_wb_adr[3:2] == 2'd2 ? {32'd0, i_s_wb_rdat, 64'd0} :
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i_s_wb_adr[3:2] == 2'd1 ? {64'd0, i_s_wb_rdat, 32'd0} :
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{96'd0, i_s_wb_rdat } ;
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end
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else
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begin : wbs32
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assign o_s_wb_wdat = i_s_wb_wdat;
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assign o_s_wb_sel = i_s_wb_sel;
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assign o_s_wb_rdat = i_s_wb_rdat;
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end
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endgenerate
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assign o_s_wb_ack = i_s_wb_ack;
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assign o_s_wb_err = i_s_wb_err;
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assign o_s_wb_adr = i_s_wb_adr;
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assign o_s_wb_we = i_s_wb_we ;
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assign o_s_wb_cyc = i_s_wb_cyc;
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assign o_s_wb_stb = i_s_wb_stb;
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endmodule
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