VT6103 datasheet(32/46 Pages) VIA

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VT6103 - Fast Ethernet 10 / 100 PHY / Transceiver

Revision 1.1 April 15, 2002

-26-

Functional Description

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Jabber Function

The jabber function monitors the VT6103's output and

disables the transmitter if it attempts to transmit a packet of

longer than legal size. A jabber timer monitors the transmitter

and disables the transmission if the transmitter is active for

approximately 20-30 ms.

Once disabled by the Jabber

function, the transmitter stays disabled for the entire time that

the ENDEC module's internal transmit enable is asserted.

This signal has to be deasserted for approximately 400-600 ms

(the “unjabber” time) before the Jabber function re-enables the

transmit outputs. The Jabber function is only meaningful in

10Base-T mode.

Status Information

VT6103 Status Information is available on the LED output

pins.

Transmit activity, receive activity, link status, link

polarity and collision activity information is output to the four

LED output pins, selectable via LEDSEL at Rx16 (Rx10h)

bit[6:5] as follows:

Table 6. LED Function Definition

LEDSE

LED0

LED1

LED2

LED3

Link / Act

Speed

Duplex

COL

Pwr / TxAct

Link / RxAct

Speed

Duplex

Speed 100

Speed 10

Act

Duplex

Pwr / TxAct

Link / RxAct

Speed

COL

Automatic Link Polarity Detection

The VT6103's 10Base-T transceiver module incorporates an

automatic link polarity detection circuit.

When seven

consecutive link pulses or three consecutive receive packets

with inverted End-of-Packet pulses are received, bad polarity

is reported.

The VT6103's 10Base-T transceiver module

corrects for this error internally and will continue to decode

received data correctly. This eliminates the need to correct the

wiring error immediately.

Internal Loopback

When the FLB_DPLL bit (bit-5) of the PHY Configuration

back in the ENDEC to the receive channel.

The transmit

drivers and receive input circuitry are enabled in transceiver

loopback mode. Loopback is used for diagnostic testing of

the data path through the transceiver without transmitting on

the network or being interrupted by receive traffic.

This

loopback function causes the data to loop back via the output

driver buffers such that the entire transceiver path is tested.

VT6103 Datasheet(PDF) 32 Page - VIA Technologies, Inc.

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