VT8235 datasheet(127/145 Pages) VIA

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-121-

Device 18 Function 0 LAN Registers

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Offset 08 – Command 0 (00h)...........................................RW

Reserved

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

Receive Poll Demand

............................... default = 0

If this bit is set to 1, the Receive Descriptor (RD) will

be polled once (this bit will be cleared by hardware

after the polling is complete)

Transmit Poll Demand

............................. default = 0

If this bit is set to 1, the Transmit Descriptor (TD)

will be polled once (this bit will be cleared by

hardware after the polling is complete)

Transmit Process

Transmit engine disabled....................... default

Transmit engine enabled (transmit may occur)

Receive Process

Receive disabled.................................... default

Receive enabled

Stop NIC

NIC enabled .......................................... default

NIC disabled (transmit/receive cannot occur)

Start NIC

No command entered ............................ default

Start the NIC

Begin Initialization Process

..................... default = 0

If this bit is set to 1, the Receive Descriptor (RD) will

be polled once (this bit functions like bit-6 but for

legacy systems)

Offset 09 – Command 1 (00h) .......................................... RW

Software Reset

No reset.................................................. default

Reset the MAC

Receive Poll Demand 1

.............................default = 0

This bit functions the same as Rx8[6]. The function

can be enabled by setting either bit (for backward

compatibility).

Transmit Poll Demand 1

..........................default = 0

This bit functions the same as Rx8[5]. The function

can be enabled by setting either bit (for backward

compatibility).

Reserved

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

TD / RD Auto Polling

Enable (polling interval is determined by

Rx6F[2:0] ) ............................................ default

Disable

Full Duplex

Set MAC to half duplex mode ............... default

Set MAC to full duplex mode

Reserved

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

Early Receive Mode

Disable (interrupt is generated after a packet

has been completely received) ............... default

Enable (interrupt is generated as soon as

packet reception has started)

VT8235 Datasheet(PDF) 127 Page - VIA Technologies, Inc.

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