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IP178C
Preliminary Data Sheet
IP178C applications: (continued)
An 8-port switch application
If pin 53 EXTMII_EN is pulled low, then MII/ RMII interface is disabled. IP178C is not connected to a CPU
and works as an 8-port switch. The ninth switch port MAC8 is unused in this application.
PHY
0
PHY
1
PHY
2
PHY
3
PHY
7
IP178C
MAC0
MAC8
MAC7
switch engine
.....
(MAC8 is unused)
TP
A 9-port switch application
If pin 53 EXTMII_EN is pulled high, then MII/ RMII interface is enaled. The ninth switch port MAC8 is
connected to a PHY through the MII/RMII interface. IP178C works as a 9-port switch. Because IP178C
doesn’t access the MII register of the external PHY through SMI, MII/RMII interface should be MAC
mode and full duplex in this application.
MII/RMII
PHY
0
PHY
1
PHY
6
PHY
7
IP178C
external
PHY
(MAC mode)
MAC0
MAC7
MAC8
switch engine
.....
.....
12/91
October 27, 2005
Copyright © 2004, IC Plus Corp.
IP178C-DS-R09
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