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AM79C976 Datasheet(PDF) 244 Page - Advanced Micro Devices |
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AM79C976 Datasheet(HTML) 244 Page - Advanced Micro Devices |
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244 / 309 page  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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