IP175A LF
Preliminary Data Sheet
10/60
February 20, 2006
Copyright © 2004, IC Plus Corp.
IP175A LF-DS-R08
Pin Descriptions (continued)
Pin no.
Label
Type
Description
External MII port setting
74
P4EXT
IPL
External MII port enable
1: Both MII interface are enabled for router application. MII1
supports PHY mode only. MII1 interfaces to internal PHY4 of
IP175A LF. It is connected to an external MAC device. MII0
supports both PHY mode and MAC mode depending on the
setting of MII0_MAC_MOD (pin 96).
0: External MII interface is disabled and IP175A LF works as a
5-port switch (default).
75
P4MII_SNI
IPL
External MII interface selection
1: SNI interface
IP175A LF supports PHY mode SNI (MII0_MAC_MOD=0),
i.e., it can be connected to an external MAC. IP175A LF
doesn’t support MAC mode SNI (MII0_MAC_MOD=1), i.e., it
should not be connected to an external PHY.
0: MII interface (default).
Pin no.
Label
Type
Description
External MII0 interface (P4EXT=1)
67
MAC_X_EN
IPH2 Flow control enable for external MII0 port
1: enable (default),
0: disable
96
MII0_MAC_MOD
IPL1
External MII0 port MAC mode
1: MII0 works as a MAC and should be connected to an external
PHY.
0: MII0 works as a PHY and should be connected to an external
MAC device (default).
This pin does not affect MII1 port.
71, 70
MDC, MDIO
IPL
SMI
The external MAC device uses the interface to program basic and
extended MII register to configure PHY 4 and switch controller,
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