hich should be in the
                     TCP or UDP header
   Bits  0-15 (LSB): Transmit Checksum Calculation Starting Point: Offset
                     in the frame where checksum calculation should begin
   </pre><p>
<h4>LocalLink header word 5:</h4>
<p>
<pre>
   Bits 16-31 (MSB): Transmit Checksum Calculation Initial Value: Checksum
                     seed value
   Bits  0-15 (LSB): Reserved
   </pre><p>
<h3>Receive Checksum Offloading</h3>
<p>
For Receive, the 15th byte to end of frame is checksumm