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IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
50/111
Mar 09, 2007
Copyright © 2004, IC Plus Corp.
IP175C/IP175CH-DS-R14
2.12
Static MAC address table
IP175C/IP175CH supports a static MAC address table, which contains two MAC address. When
IP175C/IP175CH receives a packet whose destination address matches the pre-defined MAC address in
the table, it forwards the packets to a specfic port defined in the MII register 30.26[13:8]
static_port_mask_1 and 30.26[5:0] static_port_mask_0. Use can setup the MAC address table and static
port mask by programming MII register 30.20~30.26.The static MAC address table has precedence over
the dynamic DA look up result.
In a spanning tree application, the MII register 30.26[7] static_override_0 is “1”, MII register 30.26[6]
static_valid_0 is ”1”, the MII register 30.20~22 MAC address field is 01-80-c2-00-00-00 and the MII
register 30.26[5:0] static_port_mask_0 is 6’b100000 (MII0). That is, IP175C/IP175CH will forward BPDU
to MII0 (CPU) only in spite of the port states.
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