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// ===========================================================================
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// File : scramble8.vri
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// Author : cwinward
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// Date : Mon Dec 3 11:03:46 MST 2007
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// Project : TI PHY design
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//
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// Copyright (c) notice
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// This code adheres to the GNU public license
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//
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// ===========================================================================
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//
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// $Id: scramble8.vri,v 1.1.1.1 2007-12-05 18:37:07 cmagleby Exp $
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//
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// ===========================================================================
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//
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// $Log: not supported by cvs2svn $
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//
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// ===========================================================================
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// Function : This file scrambles the rx lines and descrambles the tx lines.
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//
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// ===========================================================================
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// ===========================================================================
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#include
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task scramble8(bit [7:0] data_in, bit skp_detect, bit com_detect, bit sram_bypass, bit [15:0] lfsr_old, var bit [7:0] scramble_data, var bit [15:0] lfsr) {
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if((sram_bypass == 1'b1) | (com_detect == 1'b1)) {
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scramble_data = data_in;
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}
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else {
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scramble_data[0] = lfsr_old[15] ^ data_in[0];
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scramble_data[1] = lfsr_old[14] ^ data_in[1];
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scramble_data[2] = lfsr_old[13] ^ data_in[2];
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scramble_data[3] = lfsr_old[12] ^ data_in[3];
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scramble_data[4] = lfsr_old[11] ^ data_in[4];
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scramble_data[5] = lfsr_old[10] ^ data_in[5];
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scramble_data[6] = lfsr_old[9] ^ data_in[6];
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scramble_data[7] = lfsr_old[8] ^ data_in[7];
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}
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if(com_detect == 1'b1) {
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lfsr = 16'hFFFF;
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}
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else if(skp_detect == 1'b0) {
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lfsr[0] = lfsr_old[8];
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lfsr[1] = lfsr_old[9];
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lfsr[2] = lfsr_old[10];
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lfsr[3] = lfsr_old[8] ^ lfsr_old[11];
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lfsr[4] = lfsr_old[8] ^ lfsr_old[9] ^ lfsr_old[12];
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lfsr[5] = lfsr_old[8] ^ lfsr_old[9] ^ lfsr_old[10] ^ lfsr_old[13];
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lfsr[6] = lfsr_old[9] ^ lfsr_old[10] ^ lfsr_old[11] ^ lfsr_old[14];
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lfsr[7] = lfsr_old[10] ^ lfsr_old[11] ^ lfsr_old[12] ^ lfsr_old[15];
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lfsr[8] = lfsr_old[0] ^ lfsr_old[11] ^ lfsr_old[12] ^ lfsr_old[13];
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lfsr[9] = lfsr_old[1] ^ lfsr_old[12] ^ lfsr_old[13] ^ lfsr_old[14];
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lfsr[10] = lfsr_old[2] ^ lfsr_old[13] ^ lfsr_old[14] ^ lfsr_old[15];
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lfsr[11] = lfsr_old[3] ^ lfsr_old[14] ^ lfsr_old[15];
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lfsr[12] = lfsr_old[4] ^ lfsr_old[15];
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lfsr[13] = lfsr_old[5];
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lfsr[14] = lfsr_old[6];
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lfsr[15] = lfsr_old[7];
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}
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else {
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lfsr = lfsr_old;
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}
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}
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