from typing import Final

NBUS_RX_META: Final    =  4

NBUS_BROADCAST_ADDR: Final =  0x00
NBUS_BRIDGE_ADDR: Final    =  0xFF



NBUS_FMT_SIZE: Final   =  4
NBUS_TS_SIZE: Final    =  4
NBUS_CRC_SIZE: Final   =  1
NBUS_MA_SIZE: Final    =  1
NBUS_SA_SIZE: Final    =  1

NBUS_MA_ADDR: Final    =  0
NBUS_SA_ADDR: Final    =  1
NBUS_FC_ADDR: Final    =  2
NBUS_DATA0_ADDR: Final =  3
NBUS_CRC_ADDR: Final   = -1