Time Stamp Injection

// Build the packet
NT_NET_SET_PKT_CLEAR_DESCR_EXT7((&pktNetBuf));              // Clears the packet descriptor - must be done first
NT_NET_SET_PKT_DESCR_TYPE_EXT7((&pktNetBuf));               // Sets the packet to use extended descriptor 7
NT_NET_SET_PKT_CAP_LENGTH((&pktNetBuf), currentPacketSize); // Sets the capture/stored length of the packet
                                                            // This includes the packet header and the alignment padding
NT_NET_SET_PKT_WIRE_LENGTH((&pktNetBuf), currentPacketSize);// Sets the wirelength of the packet
NT_NET_SET_PKT_CALC_L2_CRC((&pktNetBuf), 1);                // Forces the FPGA to calculate a new L2 CRC
NT_NET_SET_PKT_TXPORT((&pktNetBuf), txPort);                // Only necessary if transmitting on a capture adapter
                                                            // On an in-line adapter, the port is decided by the NT_NetTxGet function
NT_NET_SET_PKT_INJECT_TIMESTAMP((&pktNetBuf), 0);           // Injects a timestamp at offset 0 in the packet
NT_NET_UPDATE_PKT_L2_PTR((&pktNetBuf));                     // Updates the L2 pointer of the packet to match the new descriptor
if(firstPaket == 0) {
  if(txTiming == NT_TX_TIMING_ABSOLUTE) {
    NT_NET_SET_PKT_TXNOW((&pktNetBuf), 0);
    NT_NET_SET_PKT_TXSETCLOCK((&pktNetBuf), 1);
  }
  else {
    NT_NET_SET_PKT_TXNOW((&pktNetBuf), 1);
  }
  firstPaket = 1;
}
else {
  NT_NET_SET_PKT_TIMESTAMP((&pktNetBuf), ((ts+99)/100)*10); // Rounds up to nearest 10 ns tick - the packet timestamp decides when
                                                            // the packet is transmitted and is different from the injected
                 // timestamp
  NT_NET_SET_PKT_TXNOW((&pktNetBuf), 0);
}
// Creates a packet with an incrementing 32bit pattern
// Note that the packet does not contain valid MAC address, etc.
for(i=0; i<currentPacketSize/4; i++) {
  *((uint32_t*)NT_NET_GET_PKT_L2_PTR((&pktNetBuf))+i) = payload++;
}
Section	Key	Values	Default	Description
System	TimestampMethod	SOF EOF	EOF	SOF = Start of Frame EOF = End of Frame Reception of packets (RX) Packets can be time-stamped when the first byte is received or when the last byte is received Default is when the last byte is received Transmission of packets (TX) Packets can be time-stamped when the first byte is put on the wire or when the last byte is put on the wire Default is when the last byte is put on the wire