RC82562EP Intel, RC82562EP Datasheet - Page 173
RC82562EP
Manufacturer Part Number
RC82562EP
Description
IC ETH 10/100 PLC DEV CTRL 64BGA
Manufacturer
Intel
Specifications of RC82562EP
Rohs Status
RoHS non-compliant
Controller Type
Ethernet Controller
Interface
IEEE 802.3
Voltage - Supply
3.135 V ~ 3.465 V
Mounting Type
Surface Mount
Package / Case
64-BGA
Current - Supply
-
Operating Temperature
-
Other names
832361
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B.4.1.1
B.4.1.2
B.4.2
B.5
10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual
Frame Types
Verification Types
82559 Compatibility
In 82559 compatibility mode, the 82550 and 82551 compute the checksum of the whole incoming
packet excluding the MAC header and CRC. The checksum word is appended at the end of the
packet in the receive buffer in host memory. If the CRC is posted to host memory, the checksum
word follows the CRC. The byte count field in the receive memory structures includes the
checksum word.
VLAN Tagging
When the 82550 or 82551 receives a frame with a VLAN tag, it sets bit T in the RFD status word
(bytes 1h:0h) and copies the tag (the two bytes after the constant 8100h) to the VLAN field in the
RFD (bytes 11h:10h). If VLAN stripping is enabled, the device strips the four VLAN bytes, and
the received packet is copied to host memory without these four bytes.
•
•
•
•
•
•
Ethernet v2. If the Ethernet v2 type field equals 0800h, the first byte of IP header is expected
right after the optional VLAN field.
SNAP. The 82550 and 82551 skip the DSAP and SSAP fields. The Control field is expected to
have a value of 03h. If a match occurs, the first byte of IP header is expected right after the
optional VLAN field.
IPv4 header checks. For IPv4 frames, no fragmentation occurs. The protocol field should
equal:
Other protocols will not have a checksum.
TCP header checks. The packet length should be greater than or equal to the TCP header.
UDP header checks. The packet length should be greater than or equal to the UDP header.
Checksum. The receive checksum machine computes the IP header checksum, the tunneled IP
header checksum (if one is present), the TCP/UDP pseudo header checksum, and the TCP/
UDP checksum. If a mismatch occurs, the frame is transferred to memory with an error
indication according to the configuration.
— 06 for TCP
— 17 for UDP
— 04 for IP
— 50 for ESP
— 51 for AH
82550 and 82551 Specific Information
165
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