VT8235 datasheet(129/145 Pages) VIA

129 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-123-

Device 18 Function 0 LAN Registers

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Offset 23-20 – Receive Status (0000 0000h).....................RW

Descriptor Owner

Descriptor Owned By Host (NIC cannot

access descriptor)

Descriptor Owned by NIC (NIC can access

descriptor)

This bit has no default so must be set by the driver at

initialization.

30-27 Reserved

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

26-16 Received Packet Length

......................... RO, def = 0

Received Packet Successfully

................ RO, def = 0

Reserved

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

NIC Accepted Multicast Packet

............ RO, def = 0

NIC Accepted Broadcast Packet

........... RO, def = 0

NIC Accepted Physical Address PacketRO,

def = 0

Chain Buffer

................................................... def = 0

Set if packet too large to occupy a single receive

transcriptor.

9-8

Buffer Descriptor Start / End

............................. RO

For packets too large to fit into a single receive

descriptor and thus occupy multiple RD’s, this field

reports whether this RD is the start, middle or end.

00 Chain Buffer Middle Descriptor............ default

01 Chain Buffer End Descriptor

10 Chain Buffer Start Descriptor

11 Single Buffer Descriptor (packet accupies only

one descriptor)

Buffer Underflow Error

.................. RO, default = 0

System Error

.................................... RO, default = 0

Run Packet

(< 64 bytes) ................... RO, default = 0

Long Packet

(> 2500 bytes).............. RO, default = 0

FIFO Overflow Error

...................... RO, default = 0

Frame Alignment Error

.................. RO, default = 0

CRC Error

...................................... RO, default = 0

Receiver Error

.................................. RO, default = 0

Offset 27-24 – Rx Data Buffer Control (0000 0000h)..... RO

31-11 Reserved

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

10-0 Rx Data Buffer Size

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

The receive data buffer size for this descriptor. The

total byte count of the entire frame will be stored in

the last descriptor.

Offset 2B-28 – Rx Data Buffer Start Address ................. RO

31-0 Rx Data Buffer Start Address

Offset 2F-2C – Rx Data Buffer Branch Address............. RO

31-0 Rx Data Buffer Branch Address

Note: Rx20-2F reflect values from the RD being accessed.

VT8235 Datasheet(PDF) 129 Page - VIA Technologies, Inc.

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