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IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
39/111
Mar 09, 2007
Copyright © 2004, IC Plus Corp.
IP175C/IP175CH-DS-R14
MII2 PHY mode (interface to an external MAC, MII registers can be accessed via MDC0, MDIO0)
EEPROM
MII register
Pin
Name
Reg
Name
Phy
Reg
MII2 speed
P3_FORCE_100
P3_FORCE_100
20.3
P3_FORCE_100
29
22.9
MII2 duplex
P3_FORCE_FULL P3_FORCE_FULL
21.3
P3_FORCE_FULL
29
22.4
MII2 pause
--
MAC_X_EN
4.3
MAC_X_EN
29
18.10
MII2 MAC mode (interface to an external PHY), there are two ways to set MII2 speed, duplex and pause.
1. IP175C/IP175CH reads the MII registers 0~5 of external PHY through MDC1, MDIO1.
MII2
Speed
Duplex
Pause
1.
IP175C/IP175CH polls the external PHY with address defined in MII register
31.4[4:0]. The default address value is 00001.
2.
After reset, IP175C/IP175CH writes the speed/duplex/pause capability to the
external PHY using the content of MII register 31.4[12:8].
3.
IP175C/IP175CH reads MII register 0~5 of external PHY as MII2 speed,
duplex and pause continuously.
2. Force mode (MDC1 and MDIO1 are not connected to external PHY)
EEPROM
MII register
Pin
Name
Reg
Name
Phy
Reg
MII2 speed
P3_FORCE_100
P3_FORCE_100
20.3
P3_FORCE_100
29
22.9
MII2 duplex
P3_FORCE_FULL P3_FORCE_FULL
21.3
P3_FORCE_FULL
29
22.4
MII2 pause
--
MAC_X_EN
4.3
MAC_X_EN
29
18.10
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