Motorola MC68838 User Manual page 81

To implement the various types of bridges and the resultant end stations discussed in the
ANSI and IEEE standards, the MAC can be used as follows:
1. TR_BR_FWD , for a transparent bridge, and MATCH , for an end station, provide a
MAC status setting functionality.
2. Promiscuous mode provides a MAC status repeating functionality.
3. A MAC status clearing functionality is provided by Option_2 for an end station.
4. Both MATCH and TR_BR_FWD provide the necessary timing extensions required
to perform source address routing and transparent bridging table lookup when
EXT_DA_MATCH = 1.
5. RABORT or RABORT2 can be used with the MATCH or TR_BR_FWD pin, or in
promiscuous mode, to stop the transfer of a frame from the MAC to the FSI and to
properly set the C-bit for a rejected or incompletely received frame.
MOTOROLA MC68838 USER'S MANUAL 9-5