VT8235 datasheet(126/145 Pages) VIA

126 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-120-

Device 18 Function 0 LAN Registers

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LAN I/O Registers

Offset 05-00 – Ethernet Address ......................................RW

Unless the EEPROM is disabled, the Ethernet Address is

loaded to this register from the EEPROM every time the

system starts up.

Offset 06 – Receive Control (00h) ....................................RW

7-5

Receive FIFO Threshold

This field determines the threshold required before

data in the receive FIFO is forwarded.

When the

FIFO reaches the level selected in this field, data will

start being forwarded.

000 64 byte................................................... default

001 32 byte

010 128 byte

011 256 byte

100 512 byte

101 768 byte

110 1024 byte

111 Store & Forward (data is forwarded after the

entire packet has been received)

Physical Address Packets Accepted

Packets with a physical destination address are

not accepted........................................... default

All packets with a physical destination address

are accepted........................................... default

Broadcast Packets Accepted

Broadcast packets are rejected .............. default

Broadcast packets are accepted

Multicast Packets Accepted

Multicast packets are rejected ............... default

Multicast packets are accepted

Small Packets Accepted

Packets smaller than 64 bytes are rejected .. def

Packets smaller than 64 bytes are accepted

Error Packets Accepted

Packets with receive errors are rejected ...... def

Packets with receive errors are accepted

Offset 07 – Transmit Control (08h)................................. RW

7-5

Transmit FIFO Threshold

This field determines the threshold required before

data in the transmit FIFO is forwarded. When the

FIFO reaches the level selected in this field, data will

start being forwarded.

100T

10T

000 128 byte

64 byte ................................ default

001 256 byte

128 byte

010 512 byte

256 byte

011 1024 byte 512 byte

1xx Store & Forward

Reserved

........................................always reads 0

Backoff Priority Selection

This bit determines the backoff algorithm used when

collision occurs.

VIA backoff algorithm

NSC compatible backoff algorithm ...... default

2-1

Transmit Loopback Mode

00 Normal ................................................... default

01 Internal loopback (signal is looped back to the

host from the MAC)

10 MII loopback (signal is looped back to the host

from the PHY)

11 -reserved- (do not program)

Reserved

........................................always reads 0

VT8235 Datasheet(PDF) 126 Page - VIA Technologies, Inc.

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