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AM79C976 데이터시트(PDF) 244 Page - Advanced Micro Devices

부품명 AM79C976
상세설명  PCnet-PRO??10/100 Mbps PCI Ethernet Controller
PDF  309 Pages
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C976 데이터시트(HTML) 244 Page - Advanced Micro Devices

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244
Am79C976
8/01/00
P R E L I M INARY
0
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.
4
31-18
Reserved.
4
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
4
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.
8
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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