LAN9250 datasheet(307/421 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001913A-page 307

LAN9250

VLAN tagged and non-VLAN tagged frame formats are supported. Multiple VLAN tags are handled as long as they all

use the standard type of 0x8100. Both Ethernet II (type field) and 802.3 (length field) w/ SNAP frame formats are sup-

ported.

The following tests are made to determine that the packet is a PTP message.

• MAC Destination Address checking is enabled via the TX MAC Address Enable (TX_MAC_ADDR_EN) in the

1588 Port TX Parsing Configuration Register (1588_TX_PARSE_CONFIG).

For the Layer 2 message format, the addresses of 01:1B:19:00:00:00 or 01:80:C2:00:00:0E may be enabled via

the 1588 Port TX Parsing Configuration Register (1588_TX_PARSE_CONFIG). Either address is allowed for Peer

delay and non-Peer delay messages.

For IPv4/UDP messages, any of the IANA assigned multicast IP destination addresses for IEEE 1588

(224.0.1.129 and 224.0.1.130 through .132), as well as the IP destination address for the Peer Delay Mechanism

(224.0.0.107) may be enabled via the 1588 Port TX Parsing Configuration Register (1588_TX_PARSE_CONFIG).

These IP addresses map to the 802.3 MAC addresses of 01:00:5e:00:01:81 through 01:00:5e:00:01:84 and

01:00:5e:00:00:6B. Any of these addresses are allowed for Peer delay and non-Peer delay messages.

For IPv6/UDP messages, any of the IANA assigned multicast IP destination addresses for IEEE 1588

(FF0X:0:0:0:0:0:0:181 and FF0X:0:0:0:0:0:0:182 through :184), as well as the IP destination address for the Peer

Delay Mechanism (FF02:0:0:0:0:0:0:6B) may be enabled via the 1588 Port TX Parsing Configuration Register

(1588_TX_PARSE_CONFIG). These IP addresses map to the 802.3 MAC addresses of 33:33:00:00:01:81

through 33:33:00:00:01:84 and 33:33:00:00:00:6B. Any of these addresses are allowed for Peer delay and non-

Peer delay messages.

A user defined MAC address defined in the 1588 User MAC Address High-WORD Register (1588_US-

ER_MAC_HI) and the 1588 User MAC Address Low-DWORD Register (1588_USER_MAC_LO) may also be indi-

vidually enabled for the above formats.

• If the Type / Length Field indicates an EtherType then

For the Layer 2 message format, the EtherType must equal 0x88F7.

For IPv4/UDP messages, the EtherType must equal 0x0800.

For IPv6/UDP messages, the EtherType must equal 0x86DD.

• If the Type / Length Field indicates a Length and the next 3 bytes equal 0xAAAA03 (indicating that a SNAP header

is present) and the SNAP header has a OUI equal to 0x000000 then

For the Layer 2 message format, the EtherType in the SNAP header must equal 0x88F7.

For IPv4/UDP messages, the EtherType in the SNAP header must equal 0x0800.

For IPv6/UDP messages, the EtherType in the SNAP header must equal 0x86DD.

• For IPv4/UDP messages, the Version field in the IPv4 header must equal 4, the IHL field must be 5 and the Proto-

col field must equal 17 (UDP) or 51 (AH). IPv4 options are not supported.

• For IPv6/UDP messages, the Version field in the IPv6 header must equal 6 and the Next Header field must equal

17 (UDP) or one of the IPv6 extension header values (0 - Hop-by-Hop Options, 60 - Destination Options, 43 -

Routing, 44 - Fragment, 51 - Authentication Header (AH)

• For IPv4/UDP messages, Destination IP Address checking is enabled via the TX IP Address Enable (TX_IP_AD-

DR_EN) in the 1588 Port TX Parsing Configuration Register (1588_TX_PARSE_CONFIG). Any of the IANA

assigned multicast IP destination addresses for IEEE 1588 (224.0.1.129 and 224.0.1.130 through .132), as well

as the IP destination address for the Peer Delay Mechanism (224.0.0.107) may be enabled via the 1588 Port TX

Parsing Configuration Register (1588_TX_PARSE_CONFIG). Any of these addresses are allowed for Peer delay

and non-Peer delay messages.

• For IPv6/UDP messages, Destination IP Address checking is enabled via the TX IP Address Enable (TX_IP_AD-

DR_EN) in the 1588 Port TX Parsing Configuration Register (1588_TX_PARSE_CONFIG). Any of the IANA

assigned multicast IP destination addresses for IEEE 1588 (FF0X:0:0:0:0:0:0:181 and FF0X:0:0:0:0:0:0:182

through :184), as well as the IP destination address for the Peer Delay Mechanism (FF02:0:0:0:0:0:0:6B) may be

enabled via the 1588 Port TX Parsing Configuration Register (1588_TX_PARSE_CONFIG). Any of these

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