IP178C-DS-R05 datasheet(35/93 Pages) ETC2

35 / 93 page

IP178C/IP178C LF/IP178CH/IP178CH LF

Datasheet

35/93

June 21, 2007

IP178Cx-DS-R12

2.4

Port base VLAN

IP178C/IP178CH supports port base VLAN functions. It separates IP178C/IP178CH 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/IP178CH 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 duration 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.

IP178C-DS-R05 数据表(PDF) 35 Page - List of Unclassifed Manufacturers