Subversion Repositories pcie_vera_tb

// ===========================================================================

// 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 

#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

}