LAN9250 datasheet(301/421 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001913A-page 301

LAN9250

• 100BASE-TX: 285ns

• 100BASE-FX: 231ns plus the receive latency of the fiber transceiver

• 10BASE-T: 1674ns

14.2.1.2

1588 Receive Parsing

The 1588 Receive parsing block parses the incoming frame to identify 1588 PTP messages.

Note:

Support for the IEEE 1588-2002 (v1) packet format is not provided.

The Receive parsing block may be programmed to detect PTP messages encoded in UDP/IPv4, UDP/IPv6 and Layer

2 Ethernet formats via the RX IPv4 Enable (RX_IPV4_EN), RX IPv6 Enable (RX_IPV6_EN) and RX Layer 2 Enable

(RX_LAYER2_EN) bits in the 1588 Port RX Parsing Configuration Register (1588_RX_PARSE_CONFIG).

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 RX MAC Address Enable (RX_MAC_ADDR_EN) in the

1588 Port RX Parsing Configuration Register (1588_RX_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 RX Parsing Configuration Register (1588_RX_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 RX Parsing Configuration Register (1588_RX_PARSE_CON-

FIG). 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 RX Parsing Configuration Register

(1588_RX_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 -

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