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dgisselq |
////////////////////////////////////////////////////////////////////////////////
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//
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// Filename: rxehwmac.v
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//
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// Project: OpenArty, an entirely open SoC based upon the Arty platform
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//
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// Purpose: To remove MACs that aren't our own. The input is a nibble
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// stream, where the first nibble is the first nibble of the
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// destination MAC (our MAC). If enabled, this MAC is removed from the
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// stream. If the MAC matches, the stream is allowed to continue. If
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// the MAC doesn't match, the packet is thrown away.
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2016, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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module rxehwmac(i_clk, i_ce, i_en, i_cancel, i_hwmac, i_v, i_d, o_v, o_d, o_err, o_broadcast);
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input i_clk, i_ce, i_en, i_cancel;
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input [47:0] i_hwmac;
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input i_v;
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input [3:0] i_d;
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output reg o_v;
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output reg [3:0] o_d;
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output wire o_err;
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output reg o_broadcast;
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reg [47:0] r_hwmac;
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reg r_cancel, r_err, r_hwmatch, r_broadcast;
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reg [19:0] r_buf;
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reg [29:0] r_p;
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always @(posedge i_clk)
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if (i_ce)
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begin
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if (i_cancel)
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r_cancel <= 1'b1;
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else if ((!i_v)&&(!o_v))
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r_cancel <= 1'b0;
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if ((i_en)&&(i_v)&&(r_p[11]))
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begin
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if (r_hwmac[47:44] != i_d)
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r_hwmatch <= 1'b0;
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if (4'hf != i_d)
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r_broadcast<= 1'b0;
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end
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r_err <= (i_en)&&(!r_hwmatch)&&(!r_broadcast)&&(i_v);
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o_broadcast <= (r_broadcast)&&(!r_p[11])&&(i_v);
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r_buf <= { r_buf[14:0], i_v, i_d };
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if (((!i_v)&&(!o_v))||(i_cancel))
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begin
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r_p <= 30'h3fff_ffff;
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r_hwmac <= i_hwmac;
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r_hwmatch <= 1'b1;
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r_broadcast <= 1'b1;
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r_buf[ 4] <= 1'b0;
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r_buf[ 9] <= 1'b0;
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r_buf[14] <= 1'b0;
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r_buf[19] <= 1'b0;
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o_v <= 1'b0;
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o_d <= i_d;
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end else begin
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r_p <= { r_p[28:0], 1'b0 };
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if (i_en)
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begin
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// Skip the first 6 bytes, and everything
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// following if the MAC doesn't match
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o_v <= (!r_p[11])&&(!r_cancel)&&(i_v);
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o_d <= i_d;
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end else begin
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// In this case, we wish to ignore everything,
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// but still duplicate the EtherType words
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if (r_p[27])
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{ o_v, o_d } <= { (i_v)&&(!r_cancel), i_d };
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else
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{ o_v, o_d } <= { (r_buf[19])&&(!r_cancel), r_buf[18:15] };
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end
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end
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if ((!i_en)&&(r_p[27]))
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begin // Clear out the top half of the EtherType word
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r_buf[18:15] <= 4'h0;
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r_buf[13:10] <= 4'h0;
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end
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end
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assign o_err = r_err;
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endmodule
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