Kontron COMe Starterkit Eval T2 Manual de usuario descargar pdf (Pagina 71)

COM Express Interfaces

Table 17: LAN Interface LED Function

LED-Function LED Color# LED State Description

Link Speed Green / Orange Off 10 Mbps link speed

Green 100 Mbps link speed

Orange 1000 Mbps link speed

Link Status & Activity Yellow Off No Link

Steady On Link established, no activity detected

Blinking Link established, activity detected

2.7.1.2. LAN 1 and 2 shared with IDE

The Type 2 COM Express Module only provides one LAN port to the carrier. Type 3 and 5 COM

Express Modules provide two additional 10/100/1000BASE-T Gigabit Ethernet ports in place of

the IDE port, and Type 5 Module definitions include an option to support 10 Gigabit Ethernet port

operation.

This Design Guide does not explicitly define Carrier Board support for the Type 3 and 5 COM

Express Modules. However, it is recommended that a carrier supporting one of those Modules

should follow the guidelines for the LAN 0 port carrier circuit in this section when defining the

LAN 1 and 2 port carrier circuits.

2.7.1.3. PHY / Magnetics Connections

The COM Express Module specification partitions the IEEE 802.3 PHY / MDI interface circuit

resources between the Module and carrier, with the PHY located on the Module and the coupling

magnetics located on the carrier, preferably physically integrated in the RJ-45 receptacle housing

associated with the port. Section 5.4.5 of the COM Express Module specification shows this

circuit topology and provides a high level signal attenuation budget for Ethernet signals

traversing this circuit.

In order to meet the signal performance requirements for MDI signals as defined in the IEEE

802.3-2005 specification and to ensure maximum interoperability of COM Express Modules and

carriers, the PHY / Magnetics circuit should be implemented using the following guidelines:

● The carrier should provide a full 8-wire (10/100/1000BASE-T) interface circuit to the COM

Express Module

● Any secondary side resistive terminations required by the Module PHY will be present on the

Module and are not on the Carrier

● The center tap reference signal should be routed from the COM Express Module connector to

the secondary side center tap of each transformer as defined in the IEEE 802.3-2005

specification, without any series resistance or impedance circuits

● The Carrier Board design should utilize a coupling transformer capable of interoperating with

the largest possible number of PHY devices

● The Carrier Board design should have the primary side and secondary side center tap

termination components (75 Ω resistors and 100 nF capacitors, respectively) placed

physically as close to the coupling transformer as possible

● The coupling transformer should be placed no further than 100mm (3.9”) from the COM

Express Module connector on the Carrier Board.

● It is recommended that the carrier use a RJ-45 connector with an integrated transformer.

However, if a discrete coupling transformer is used, the transformer must be placed no further

than 25mm (1.0”) from the RJ-45 receptacle.

PICMG

COM Express

Carrier Board Design Guide Rev. 2.0 / December 6, 2013

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