dp83820 National Semiconductor Corporation, dp83820 Datasheet - Page 21

• Manufacturer Part Number: dp83820
• Description: 10/100/1000 Mb/s Pci Ethernet Network Interface Controller
• Manufacturer: National Semiconductor Corporation

3.0 Functional Description
31-22
31-23
15-0
15-0
bit
bit
21
20
19
18
17
16
22
21
20
19
18
17
16
UDPERR
UDPPKT
UDPPKT
TCPERR
TCPPKT
TCPPKT
IPERR
IPPKT
IPPKT
VPKT
VPKT
VTCI
VTCI
tag
tag
UDP Packet
TCP Packet
IP Packet
VLAN Packet
VLAN Tag Control
Information
UDP Checksum Error
UDP Packet
TCP Checksum Error
TCP Packet
IP Checksum Error
IP Packet
VLAN Packet
VLAN Tag Control
Information
Table 3-6 Transmit
(Continued)
Table 3-7 Receive
description
description
extsts
extsts
21
unused
Indicates packet contains a UDP header and enables
checksum generation for the UDP header if Checksumming
is enabled on a per-packet basis.
unused
Indicates packet contains a TCP header and enables
checksum generation for the TCP header if Checksumming
is enabled on a per-packet basis.
unused
Indicates packet contains a IP header and enables
checksum generation for the IP header if Checksumming is
enabled on a per-packet basis.
Insert VLAN tag.
This is the VLAN TCI field to be inserted in the packet if the
VPKT bit is set.
unused
Indicates a checksum error was detected in the UDP header.
Indicates an UDP header was detected for the packet.
Indicates a checksum error was detected in the TCP header.
Indicates an TCP header was detected for the packet.
Indicates a checksum error was detected in the IP header.
Indicates an IP header was detected for the packet.
Packet contained a VLAN tag. This bit will be set if VLAN
packet detection is enabled and the packet contained the
correct type value.
This is the VLAN TCI field to be extracted from the packet. It
contains the user_priority, CFI, and VID fields.
Bit Definitions
Bit Definitions
usage
usage
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