IP178C
Preliminary Data Sheet
33/91
October 27, 2005
Copyright © 2004, IC Plus Corp.
IP178C-DS-R09
2.4
Port base VLAN
IP178C supports port base VLAN functions. It separates IP178C into some groups (VLAN). A port is
limited to communicate with other ports within the same group when the function is enabled. Frames will
be limited in a VLAN group and will not be forwarded out of this VLAN group. A port can be assigned to
one or more VLAN groups. The members (ports) of a VLAN group are assigned by programming
EEPROM register 64[7:0]~81[7:0], or MII register 31.0[8:0]~31.8[8:0].
The VLAN function can be active even if there is no EEPROM. IP178C supports an easy way to enable a
sub set VLAN function without programming registers. A default configuration of VLAN is adopted if pin
79 VLAN_ON is pulled high. The VLAN guration is shown in the following table. The setting in register
takes precedence of the setting on pins.
VLAN_ON
EXTMII_EN
Configuration
0
X
Function disabled
1
0
VLAN groups:
(P0, P7), (P1, P7), (P2, P7), (P3, P7),
(P4, P7), (P5, P7), (P6, P7)
1
1
VLAN groups:
(P0, MII), (P1, MII), (P2, MII), (P3, MII),
(P4, MII), (P5, MII), (P6, MII), (P7, MII)
Note: P0 means port 0. P7 means port7. MII means MII port.
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