VT8235 datasheet(130/145 Pages) VIA

130 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-124-

Device 18 Function 0 LAN Registers

UrpuytvrÃDp

XrÃ8rp

Offset 43-40 – Transmit 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.

30-16 Reserved

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

Transmit Error

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

Transmit Successful .............................. default

Excessive Collisions During Transmit Attempt

Reserved

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

System Error

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

Invalid TD Format or Structure or TD Overflow

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

Transmit Data FIFO Underflow

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

Carrier Sense Lost During Transmit

... RO, def = 0

Out of Window Collision

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

(collision outside initial 64 bytes)

Transmit Abort (Excessive Collisions)

. RO, def = 0

CD Heartbeat Issued

(10BaseT Only) ... RO, def = 0

6-5

Reserved

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

Collision Detected During Transmit

..... RO, def = 0

3-0

Collision Retry Count

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

Offset 47-44 – Tx Data Buffer Control (0000 0000h)...... RO

31-24 Reserved

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

Send-Complete Interrupt

Interrupt not generated........................... default

Interrupt generated after send complete

End of Transmit Packet

For packets too large to fit into a single transmit

descriptor and thus occupy multiple TD’s, this bit

reports whether this TD is the End TD.

This TD is not the End TD .................... default

This TD is the End TD

Start of Transmit Packet

For packets too large to fit into a single transmit

descriptor and thus occupy multiple TD’s, this bit

reports whether this TD is the Start TD.

This TD is not the Start TD ................... default

This TD is the Start TD

20-17 Reserved

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

Disable CRC Generation

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

Chain Buffer

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

14-11 Reserved

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

10-0 Tx Data Buffer Size

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

The transmit data buffer size for this descriptor. The

total byte count of the entire frame will be stored in

the last descriptor.

Offset 4B-48 – Tx Data Buffer Start Address.................. RO

31-0 Tx Data Buffer Start Address

Offset 4F-4C – Tx Data Buffer Branch Address ............. RO

31-4 Tx Data Buffer Branch Address

3-1

Reserved

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

Tx Interrupt Enable

Issue interrupt for this packet................. default

No interrupt generated

VT8235 Datasheet(PDF) 130 Page - VIA Technologies, Inc.

VT8235 Datasheet(HTML) 130 Page - VIA Technologies, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL