jspc29.x-matter.uni-frankfurt.de Git - trb5sc.git/blob

   1 //**************************************************************************\r
   2 // *************************************************************************\r
   3 // *                LATTICE SEMICONDUCTOR CONFIDENTIAL                     *\r
   4 // *                         PROPRIETARY NOTE                              *\r
   5 // *                                                                       *\r
   6 // *  This software contains information confidential and proprietary      *\r
   7 // *  to Lattice Semiconductor Corporation.  It shall not be reproduced    *\r
   8 // *  in whole or in part, or transferred to other documents, or disclosed *\r
   9 // *  to third parties, or used for any purpose other than that for which  *\r
  10 // *  it was obtained, without the prior written consent of Lattice        *\r
  11 // *  Semiconductor Corporation.  All rights reserved.                     *\r
  12 // *                                                                       *\r
  13 // *************************************************************************\r
  14 //**************************************************************************\r
  15 \r
  16 `timescale 1ns/100ps\r
  17 \r
  18 module rate_resolution (\r
  19         gbe_mode,\r
  20         sgmii_mode,\r
  21         an_enable,\r
  22         advertised_rate,\r
  23         link_partner_rate,\r
  24         non_an_rate,\r
  25 \r
  26         operational_rate\r
  27 );\r
  28 \r
  29 input gbe_mode;\r
  30 input sgmii_mode;\r
  31 input an_enable;\r
  32 input [1:0] advertised_rate; // 00=10Mbps    01=100Mbps    10=1Gbps\r
  33 input [1:0] link_partner_rate;\r
  34 input [1:0] non_an_rate;\r
  35 \r
  36 output [1:0] operational_rate;\r
  37 reg [1:0] operational_rate;\r
  38 \r
  39 \r
  40 \r
  41 always @(gbe_mode or sgmii_mode or an_enable or advertised_rate or link_partner_rate or non_an_rate) begin\r
  42         if (gbe_mode) begin\r
  43                 operational_rate <= 2'b10; // 1Gbps\r
  44         end\r
  45         else begin\r
  46                 if (an_enable) begin\r
  47                         if (sgmii_mode) begin\r
  48                                 // PHY Mode\r
  49                                 operational_rate <= advertised_rate;\r
  50                         end\r
  51                         else begin\r
  52                                 // MAC Mode\r
  53                                 operational_rate <= link_partner_rate;\r
  54                         end\r
  55                 end\r
  56                 else begin\r
  57                         // If auto-negotiation disabled, then this becomes active rate\r
  58                         operational_rate <= non_an_rate;\r
  59                 end\r
  60         end\r
  61 end\r
  62 \r
  63 \r
  64 \r
  65 endmodule\r
  66 \r