SUB_HEADER_TIME=PHY_HEADER_TIME + sizeof(tda5250_header_t)*BYTE_TIME,
SUB_FOOTER_TIME=2*BYTE_TIME, // 2 bytes crc 38400 kBit/s with 4b6b encoding
MAXTIMERVALUE=0xFFFF, // helps to compute backoff
SUB_HEADER_TIME=PHY_HEADER_TIME + sizeof(tda5250_header_t)*BYTE_TIME,
SUB_FOOTER_TIME=2*BYTE_TIME, // 2 bytes crc 38400 kBit/s with 4b6b encoding
MAXTIMERVALUE=0xFFFF, // helps to compute backoff