IP178CLF datasheet(33/91 Pages) ETC1

33 / 91 page

IP178C

Preliminary Data Sheet

33/91

October 27, 2005

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

Function disabled

VLAN groups:

(P0, P7), (P1, P7), (P2, P7), (P3, P7),

(P4, P7), (P5, P7), (P6, P7)

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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