33 / 93 page

IP178C/IP178C LF/IP178CH/IP178CH LF
Datasheet
33/93
June 21, 2007
Copyright © 2004, IC Plus Corp.
IP178Cx-DS-R12
2.2
Broadcast storm protection
A port of IP178C/IP178CH begins to drops broadcast packets if the received broadcast packets are more
than the threshold defined in MII register 31.9[15:14] or EEPROM register 83[7:6] bq_stm_thr_sel [1:0] in
10ms (100Mbps) or 100ms (10Mbps)
The function can be enabled by pulling high pin 91 BF_STM_EN or programming MII register 30.1.[6].
IP178C/IP178CH handles multicast frame as a broadcast frame in broadcast storm protection function if
pin 77 BCSTF is pulled low.