IP101A LF
Data Sheet
24/36
Oct 22, 2007
Copyright © 2004, IC Plus Corp.
IP101A LF-DS-R12
Auto-Negotiation and Related Information
IP101A LF supports clause 28 in the IEEE 802.3u standard. IP101A LF can be operated either in
10Mbps/100Mbps or half/full duplex transmission mode. IP101A LF also supports flow control mechanism
to prevent any collision in the network. If the other end does not support Auto-Negotiation function,
IP101A LF will link at half duplex mode and enter parallel detection.
At beginning of auto-negotiation, IP101A LF will advertise its own ability by sending FLP waveform out to
the other end and also listening signals from the other end. IP101A LF will place itself into correct
connection speed depends on the received signals. If NLP signal is replied from the other end, IP101A LF
will enter 10Mbps, while active idle pulses (unique 100Mbps pattern) IP101A LF will go to 100Mbps mode
instead.
Once the negotiation has completed with the other party, IP101A LF will configure itself to the desired
connection mode, i.e., 10/100Mbps or Half/Full duplex modes. If there is no detection of link pulses within
1200~1500ms, IP101A LF will enter Link Fail State and restart auto-negotiation procedure.
The auto-negotiation information is stored in the IP101A LF’s MII registers. These registers can be
modified and monitor the IP101A LF’s Auto-Negotiation status. The reset auto-negotiation in register 0 of
MII registers can be set at any time to restart auto-negotiation.
The flow control ability is also included in the IP101A LF chip. If MAC supports flow control condition, then
flow control will be enabled by setting bit 10 (Pause) of the Register 4.
Pin 37 (AN_ENA), 38 (DLPX), 39 (SPD) can be configured manually to set IP101A LF’s transmission
ability.
1. Enabling Pin 37 (set high) will put IP101A LF to Auto-Negotiation mode, if set low to pin 37, it will put
IP101A LF into forced mode.
2. Pin 38 will configure Duplex ability of IP101A LF, at high, IP101A LF is set to Full-Duplex and low will
let IP101A LF enter half duplex mode.
3. Pin 39 determines the speed of connection. If the pin is pulled high, IP101A LF is set at 100Mbps,
while at low will make IP101A LF to connect at 10Mbps speed.
AN_ENA
(Pin 37)
DLPX
(Pin38)
SPD
(Pin39)
Operation
H
L
L
Auto-Negotiation enable, the ability field does not support 100Mbps
and full duplex mode operation
H
H
L
Auto-Negotiation enable, the ability field does not support 100Mbps
operation
H
L
H
Auto-Negotiation enable, the ability field does not support full duplex
mode operation
H
H
H
Default setup, auto-negotiation enable, the IP101A LF will support
10BT/100BT, half/full duplex mode operation
L
L
L
Auto-Negotiation disable, force the IP101A LF into 10BT and half
duplex mode.
L
H
L
Auto-Negotiation disable, force the IP101A LF into 10BT and full
duplex mode.
L
L
H
Auto-Negotiation disable, force the IP101A LF into 100BT and half
duplex mode.
L
H
H
Auto-Negotiation disable, force the IP101A LF into 100BT and full
duplex mode.
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