IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
56/111
Mar 09, 2007
Copyright © 2004, IC Plus Corp.
IP175C/IP175CH-DS-R14
2.16
Force mode of PHY
Px_FORCE
0
1
1
1
1
Px_FORCE_100
X
1
1
0
0
Px_FORCE_FULL
X
1
0
1
0
IP175C/IP175CH’s capability
NWAY
100/Full
100/Half
10/Full
10/Half
IP175C/IP175CH’s link result
100/Full
100/Full
100/Half
10/Full
10/Half
Link partner’s (Nway enabled
with all capability) link result
100/Full
100/Half
100/Half
10/Half
10/Half
Note: Px_FORCE, Px_FORCE_100,and Px_FORCE_full are force mode configuration pins. X is port
number. It is from 0 to 4.
2.17
Reset
The IP175C/IP175CH supports three kinds of reset function.
1. Hardware Reset: Pin 93 RESETB should be asserted LOW at least for 5ms to reset IP175C/IP175CH.
The IP175C/IP175CH gets initial values from pins and 24C01A EEPROM after reset.
2. Software Reset: After Hardware Reset, user can write 16’h175C to PHY 30 Register 0 via SMI to
reset IP175C/IP175CH. The IP175C/IP175CH resets all of PHYs and Switch Engine, but
IP175C/IP175CH does not load initial values from pins and 24C01A EEPROM.
4. PHY Reset: Please write ”1” to bit 15 of MII register 0 to reset the PHY. The PHY address is from 0 to
4 for port 0~4 respectively.
2.18
Bandwidth control
IP175C/IP175CH provides the bandwidth control mechanism to manage or control the data rate on a
limited bandwidth network. By controlling the ingress data rate and the egress data rate, it provides a
bandwidth management solution for local area networks and also provides quick and easy allocation of
uplink or downlink speeds to meet and guarantee a wide range of customer bandwidth requirements.
IP175C/IP175CH provides the easiest way to allocate bandwidth for each port, which defined in MII
registers 31.2 ~ 31.0 or EEPROM registers 95 ~ 90. The ingress/egress data rate control range is from
128 kbps to 8 Mbps for each port.
2.19
Fiber mode of port 4 (for IP175CH only)
When FXSD4 is pulled high, port 4 will be 100Mbps fiber mode.There are two kinds of methods to set full
duplex or half duplex.
1. Setting from Pin or EEPROM
P4EXT: 0.
Duplex mode
P4_FORCE
P4_FORCE_100
P4_FORCE_FULL
Full duplex
1
1
1
Half duplex
1
1
0
P4EXT: 1
Duplex mode
P4_FORCE
P4_FORCE_100
P4_FORCE_FULL
Full duplex
X
X
X
Please set half duplex from MDC/MDIO.
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