TXHDR_TRANSMIT
#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
(TXSTAT_DONE | TXHDR_TRANSMIT))