AM79C976 datasheet(244/309 Pages) AMD

244 / 309 page

244

Am79C976

8/01/00

P R E L I M INARY

15-0

BCNT

Buffer Byte Count is the usable length of the buffer pointed to by this descriptor,

expressed as the two’s complement of the length of the buffer. This is the number of

bytes from this buffer that will be transmitted by the Am79C976 controller. This field is

written by the host and is not changed by the Am79C976 controller. There are no

minimum buffer size restrictions.

31-18

Reserved.

17-16

TCC[1:0]

VLAN Tag Control Command. This field contains a command that causes the

transmitter to add, modify, or delete a VLAN tag or to transmit the frame unaltered.

00 = Transmit the data in the buffer unaltered

01 = Delete the VLAN tag (the 13th through 16th bytes of the frame)

10 = Insert a VLAN tag containing the TCI field from the descriptor

11 = Replace the TCI field of the frame with TCI data from the descriptor

15-0

TCI[15:0]

Tag Control Information. If the contents of the TCC field are 10 or 11, the controller

will transmit the contents of the TCI field as bytes 15 and 16 of the outgoing frame.

31-0

TBADR[31:0]

Transmit Buffer Address. This field contains the low order bits of the address of the

Transmit buffer that is associated with this descriptor.

0Ch

31-0

TBADR[63:32]

Transmit Buffer Address. This field contains the high order bits of the address of the

Transmit buffer that is associated with this descriptor.

10h

31-0

Reserved.

14h

31-0

USER SPACE

User Space. Reserved for user defined data.

18h

31-0

USER SPACE

User Space. Reserved for user defined data.

1Ch

31-0

USER SPACE

User Space. Reserved for user defined data.

Offset

Bit

Name

Description

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