LAN9313 datasheet(138/398 Pages) SMSC

138 / 398 page

Three Port 10/100 Managed Ethernet Switch with MII

Datasheet

Revision 1.2 (04-08-08)

138

SMSC LAN9313/LAN9313i

DATASHEET

10.2.2

PTP Message Detection

In order to provide the most flexibility, loose packet type matching is used by the LAN9313/LAN9313i.

This assumes that for all packets received with a valid FCS, only the MAC destination address is

required to qualify them as a PTP message. For Ethernet, four multicast addresses are specified in

the PTP protocol: 224.0.1.129 through 224.0.1.132. These map to Ethernet MAC addresses

01:00:5e:00:01:81 through 01:00:5e:00:01:84. Each of these addresses has one enable bit per port in

the 1588 Configuration Register (1588_CONFIG) which enables/disables the corresponding address

as a PTP address on the specified port.

In addition to the fixed addresses, a user defined (host programmable) PTP address may be input via

the 1588 Auxiliary MAC Address High-WORD Register (1588_AUX_MAC_HI) and 1588 Auxiliary MAC

Address Low-DWORD Register (1588_AUX_MAC_LO). The user defined address may be

disabled/enabled as a PTP address on each port via the dedicated enable bits in the 1588

Configuration Register (1588_CONFIG). A summary of the supported PTP multicast addresses and

corresponding enable bits can be seen in Table 10.3.

Once a packet is determined to match a PTP destination address, it is further qualified as a Sync or

Delay_Req message type. On Ethernet, PTP uses UDP messages. Within the UDP payload is the PTP

control byte (offset 32 starting at 0). This byte determines the message type: 0x00 for a Sync message,

0x01 for a Delay_Req message. The UDP payload starts at packet byte offset 42 (from 0) for untagged

packets and at byte offset 46 for tagged packets.

Note:

Both tagged and untagged packets are supported. Only Ethernet II packet encoding and IPv4

are supported.

Note:

For proper routing of the PTP packets, the host must program an entry into the switch engine

Address Logic Resolution (ALR) Table. The MAC address should be one of the reserved

Multicast addresses in Table 10.3, with Port 0(External MII) as a destination.The Static and

Valid bits must also be set. Refer to Chapter 6, "Switch Fabric," on page 57 for more

information.

Table 10.3 PTP Multicast Addresses

PTP ADDRESS

CORRESPONDING

MAC ADDRESS

RELATED ENABLE BITS IN THE

1588_CONFIG REGISTER

224.0.1.129

(Primary)

01:00:5e:00:01:81

MAC_PRI_EN_1 (Port 1)

MAC_PRI_EN_2 (Port 2)

MAC_PRI_EN_MII (Port 0)

224.0.1.130

(Alternate 1)

01:00:5e:00:01:82

MAC_ALT1_EN_1 (Port 1)

MAC_ALT1_EN_2 (Port 2)

MAC_ALT1_EN_MII (Port 0)

224.0.1.131

(Alternate 2)

01:00:5e:00:01:83

MAC_ALT2_EN_1 (Port 1)

MAC_ALT2_EN_2 (Port 2)

MAC_ALT2_EN_MII (Port 0)

224.0.1.132

(Alternate 3)

01:00:5e:00:01:84

MAC_ALT3_EN_1 (Port 1)

MAC_ALT3_EN_2 (Port 2)

MAC_ALT3_EN_MII (Port 0)

User Defined

User Defined Address

(1588_AUX_MAC_HI &

1588_AUX_MAC_LO registers)

MAC_USER_EN_1 (Port 1)

MAC_USER_EN_2 (Port 2)

MAC_USER_EN_MII (Port 0)

LAN9313 Datasheet(PDF) 138 Page - SMSC Corporation

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