receive_packet.vri

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// ===========================================================================
// File    : receive_packet.vri
// Author  : cmagleby
// Date    : Mon Dec 3 11:03:46 MST 2007
// Project : TI PHY design
//
// Copyright (c) notice
// This code adheres to the GNU public license
//
// ===========================================================================
//
// $Id: receive_packet.vri,v 1.2 2007-12-07 20:16:29 cmagleby Exp $
//
// ===========================================================================
//
// $Log: not supported by cvs2svn $
// Revision 1.1.1.1  2007/12/05 18:37:06  cmagleby
// importing tb files
//
//
// ===========================================================================
// Function : This file processes all packets received from the 16 tx interface
//
// ===========================================================================
// ===========================================================================
#include <vera_defines.vrh>
#include "scramble8.vri"
#define COM_s 8'hbc
#define SKP_s 8'h1c
#define IDLE_s 8'h7c
#define FTS_s 8'h3c
#define STP_s 8'hfb
#define SDP_s 8'h5c
#define EDB   8'hfe
#define END_s 8'hfd

task receive_packet () {
  bit [7:0] tx_data[];
  bit       tx_datak[];
  integer   ret,ret1,ret2,ret3,ret4;
  integer   i = 0;
  integer   m = 0;
  bit[8:0]  tx_pkt;
  event     phy_start, phy_done, tlp_start, tlp_done, dllp_start, dllp_done;
  bit [7:0] phy_pkt[];
  bit [7:0] dll_pkt[];
  bit [7:0] tlp_pkt[];
  integer   j,k,l;
  bit [127:0] build_phy_pkt;
  bit [47:0]  build_dll_pkt;
  bit [127:0] build_tlp_header;
  bit [31:0]  build_tlp_data;
  bit [15:0]  expected_seq_id = 0;
  bit [15:0]  recv_seq_id = 0;
  bit [9:0]   recv_length = 0;
  bit [11:0]  byte_length = 0;
  bit [31:0]  recv_lcrc = 0;
  bit         td = 0;
  integer     kstart = 0;
  integer     debug = 1;
  bit [15:0]  lfsr = 16'hFFFF;
  bit [7:0]   scramble_data[];
  bit         skp_detect = 1'b0;
  bit         com_detect = 1'b0;
  bit         scram_bypass = 1'b0;
  bit [3:0]   bypass_count = 4'b0;
  
  printf("Look for transmit packets\n"); 
  wait_var(phy_rdy);
  @ (posedge CLOCK);
  fork
    while (1) {
      @ (posedge CLOCK);    
      tx_data[0]  = ti_phy_top.txdata16[7:0];
      tx_data[1]  = ti_phy_top.txdata16[15:8];
      tx_datak[0] = ti_phy_top.txdatak16[0];
      tx_datak[1] = ti_phy_top.txdatak16[1];
      for (i=0; i<2; i++) {

        if(com_detect == 1'b1){
          scram_bypass = 1'b1;
        }
        else if(((bypass_count == 4'b0011) & tx_datak[i] == 1'b1) | (bypass_count == 4'b1111)){
          scram_bypass = 1'b0;
        }

        if((com_detect == 1'b1) | scram_bypass){
          bypass_count = bypass_count + 1'b1;
        }
        else if(((bypass_count == 4'b0011) & tx_datak[i] == 1'b1) | (bypass_count == 4'b1111)){
          bypass_count = 4'b0000;
        }
        
        
        if({tx_datak[i],tx_data[i]} == {1'b1,SKP_s}){
          skp_detect = 1'b1;
        }
        else{
          skp_detect = 1'b0;
        }
        if({tx_datak[i],tx_data[i]} == {1'b1,COM_s}){
          com_detect = 1'b1;
        }
        else{
          com_detect = 1'b0;
        }

                  
        //printf("K-Code = %h DATA = %h COM = %h SKP = %h bypass_count = %d scram_bypass = %h\n",tx_datak[i],tx_data[i],com_detect,skp_detect,bypass_count,scram_bypass);

        //if({tx_datak[i],tx_data[i]} == {1'b1,STP_s}){
        //  printf("Start of TLP packet.\n");
        //}
        
        scramble8(tx_data[i],skp_detect,com_detect,(scram_bypass | tx_datak[i]),lfsr,scramble_data[i],lfsr);
        //printf("K-Code = %h COM = %h SKP = %h bypass = %h scramble_data = %h unscramble_data = %h lfsr = %h bypass_cnt = %d\n",tx_datak[i],com_detect,skp_detect,scram_bypass,tx_data[i],scramble_data[i],lfsr,bypass_count);
       
        mailbox_put (tx_data_mailbox, {tx_datak[i],scramble_data[i]});
        //printf("Add packet to tx_mailbox %0h\n",tx_data[i]); 
        
      }
    }
    while (1) {
      ret = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
      if (ret <= 0)
        error ("mailbox_get returned %0d\n",ret);
      //printf ("got tx_pkt %0h\n",tx_pkt);
      if (tx_pkt == {1'b1,COM_s}) {
        trigger (ONE_BLAST,phy_start);
        sync    (ALL,phy_done);
      }
      if (tx_pkt == {1'b1,STP_s}) {
        trigger (ONE_BLAST,tlp_start);
        sync    (ALL,tlp_done);
      }
      if (tx_pkt == {1'b1,SDP_s}) {
        trigger (ONE_BLAST,dllp_start);
        sync    (ALL,dllp_done);
      }
    }
    //phy layer packets
    while (1) {       
      sync(ALL,phy_start);
      //printf ("got past sync %0h\n",tx_pkt);
      phy_pkt[0] = COM_s;
      phy_pkt[4] = 0;
      phy_pkt[5] = 0;
      phy_pkt[6] = 0;
      phy_pkt[7] = 0;
      phy_pkt[8] = 0;
      phy_pkt[9] = 0;
      phy_pkt[10] = 0;
      phy_pkt[11] = 0;
      phy_pkt[12] = 0;
      phy_pkt[13] = 0;
      phy_pkt[14] = 0;
      phy_pkt[15] = 0;
      ret2 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
      //printf ("got past mailbox get %0h\n",tx_pkt);
      phy_pkt[1] = tx_pkt;
      //training set
      if ((tx_pkt == 'h1f7) || ~tx_pkt[8]) {
        for (j = 2; j <16; j++) {
          ret2 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
          phy_pkt[j] = tx_pkt;
        }
      }
      //skip fst idle
      else {
        for (j=2;j<4;j++) {
          ret1 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
          phy_pkt[j] = tx_pkt;
          //printf ("skip loop got past %0h\n",tx_pkt);
        }
      }
      build_phy_pkt = {phy_pkt[15],phy_pkt[14],phy_pkt[13],phy_pkt[12],phy_pkt[11],
                       phy_pkt[10],phy_pkt[9],phy_pkt[8],phy_pkt[7],phy_pkt[6],
                       phy_pkt[5],phy_pkt[4],phy_pkt[3],phy_pkt[2],phy_pkt[1],phy_pkt[0]};
      mailbox_put (phy_mailbox, build_phy_pkt);
      printf ("Recieved PHY PACKET (%0h) added to phy mailbox\n",build_phy_pkt);
      trigger (ONE_BLAST,phy_done);  
    }
    //dll layer packets
    while (1) {
      sync    (ALL,dllp_start);       
      //printf ("sync into dllp packet\n");     
      for (k = 0; k < 6; k++) {     
        ret3 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
        dll_pkt[k] = tx_pkt;        
        //printf ("dll_pkt(%0h)\n",dll_pkt[k]);
      }        
      ret3 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);    
      //printf ("dll this should be end(%0h)\n",tx_pkt);
      if (tx_pkt == {1'b1,END_s}) {
        build_dll_pkt = {dll_pkt[6],dll_pkt[5],dll_pkt[4],dll_pkt[3],
                         dll_pkt[2],dll_pkt[1],dll_pkt[0]};
        mailbox_put (dllp_mailbox, build_dll_pkt);
        printf ("Recieved DLL PACKET (%0h) added to dllp mailbox\n",build_dll_pkt);
      }
      else
        printf ("ERROR ->>>>>>> DLL malformed no END\n");          
      
      trigger (ONE_BLAST,dllp_done);
    }
    //tlp layer packets
    while (1) {
      sync    (ALL,tlp_start);
      printf ("sync into tlp packet\n");
      @(posedge CLOCK);
      //3 dw header + seq.
      for (k = 0; k < 14; k++) {
        //printf("debug1 %0d\n",debug++);
        ret4 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
        tlp_pkt[k] = tx_pkt; 
      }
      //dword 4
      if (tlp_pkt[2][5] == 1'b1) {
        for (k=14;k<18;k++) {
          ret4 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
          tlp_pkt[k] = tx_pkt;
        }
      }
          
      //****************************************************************************************
      //Check sequence ID and send ACK
      recv_seq_id = {tlp_pkt[0],tlp_pkt[1]};
      if (recv_seq_id != expected_seq_id) printf ("ERROR ->>>>>>> TLP BAD SEQUENCE ID of %0h\n",recv_seq_id);
      else {
        if (!semaphore_get(WAIT,my_semaphore,1))
        error ("Semaphore_get returned 0\n");
        ack_seq_num = new(recv_seq_id[7:0],{4'b0,recv_seq_id[11:8]},8'b0,8'b0);
        ack_seq_num.build_packet("ack");      
        printf("ACK PACKET Sequence Number (%0h)\n",recv_seq_id);
        for(m=0; m <= 3; m ++) {
          if(m==0){
            mailbox_put (rx_data_mailbox, {2'b01,ack_seq_num.temp_packet[0][7:0],8'h5C});
            printf("DLLP bytes SDB & DLL_TYPE %h%h.\n",ack_seq_num.temp_packet[0][7:0],8'h5C);
          }
          else if(m==1){
            mailbox_put (rx_data_mailbox, {2'b00,ack_seq_num.temp_packet[0][23:16],ack_seq_num.temp_packet[0][15:8]});
            printf("DLLP bytes 2 & 1 %h%h.\n",ack_seq_num.temp_packet[0][23:16],ack_seq_num.temp_packet[0][15:8]);
          }
          else if(m==2){
            mailbox_put (rx_data_mailbox, {2'b00,ack_seq_num.temp_packet[1][7:0],ack_seq_num.temp_packet[0][31:24]});
            printf("DLLP CRC and byte 3 %h%h.\n",ack_seq_num.temp_packet[1][7:0],ack_seq_num.temp_packet[0][31:24]);
          }
          else if(m==3){
            mailbox_put (rx_data_mailbox, {2'b10,8'hFD,ack_seq_num.temp_packet[1][15:8]});
            printf("DLLP STP and CRC %h%h.\n",8'hFD,ack_seq_num.temp_packet[1][15:8]);
          }
        }
        semaphore_put (my_semaphore, 1);
      }
      expected_seq_id++;
      //****************************************************************************************
      //build tlp get all header information
      build_tlp_header = {tlp_pkt[17],tlp_pkt[16],tlp_pkt[15],tlp_pkt[14],
                          tlp_pkt[13],tlp_pkt[12],tlp_pkt[11],tlp_pkt[10],
                          tlp_pkt[9],tlp_pkt[8],tlp_pkt[7],tlp_pkt[6],
                          tlp_pkt[5],tlp_pkt[4],tlp_pkt[3],tlp_pkt[2]};
      
      if (build_tlp_header[5] == 1'b0) {
        build_tlp_header[127:96] = 32'b0;
      }
      //****************************************************************************************
      //put header in mailbox
      mailbox_put (tlp_header_mailbox, build_tlp_header);
      printf ("Recieved TLP PACKET (%0h) added to tlp header mailbox\n",build_tlp_header);
      //****************************************************************************************
      //check for data and put into mailbox
      if (build_tlp_header[6] == 1) {
        td          = build_tlp_header[23];
        recv_length = {build_tlp_header[17:16],build_tlp_header[31:24]};
        byte_length = (recv_length*4) + (td*4); 
        printf ("TLP PACKET Receive Length dw(%0d) byte(%0d)\n",recv_length,byte_length);
        for (k=1;k<=byte_length;k++) {
          ret4 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
          tlp_pkt[k] = tx_pkt;
          if  (k%4 ==0) {            
            mailbox_put (tlp_data_mailbox, {tlp_pkt[k],tlp_pkt[k-1],tlp_pkt[k-2],tlp_pkt[k-3]});
            printf ("k = (%0d)\n",k);
            printf ("Recieved TLP DATA (%0h) added to tlp data mailbox\n",{tlp_pkt[k],tlp_pkt[k-1],tlp_pkt[k-2],tlp_pkt[k-3]});
          }
          
        }
      }
      //****************************************************************************************
      //Read out the LCRC
      for (k=0;k<=3;k++) {    
        ret4 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
        //printf("debug3 %0d\n",debug++);
        tlp_pkt[k] = tx_pkt;
      }
      printf ("tlp lcrc value = %0h \n",{tlp_pkt[3],tlp_pkt[2],tlp_pkt[1],tlp_pkt[0]});
    
      //****************************************************************************************
      //READ out the END VALUE
      ret4 = mailbox_get (WAIT,tx_data_mailbox,tx_pkt,CHECK);
      if (tx_pkt != {1'b1,END_s}) printf ("ERROR ->>>>>>> TLP malformed no END(%0h)\n",tx_pkt);      
      
      
      trigger (ONE_BLAST,tlp_done);
    }
  join none
}