if(!RX_DESC_VALID(desc_hdr)){/* invalid descriptor? Weird, the RX_ADDR seems to be saying something different. Ignore the packet and purge the RX buffer. */
if(!RX_DESC_VALID(desc_hdr)){/* invalid descriptor? Weird, the RX_ADDR seems to be saying something different. Ignore the packet and purge the RX buffer. */
//invalid descriptor ? then probably the interrupt was generated by full rx buffer
//invalid descriptor ? then probably the interrupt was generated by full rx buffer