Intel C2550 FH8065401488912 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 3 of 3

September 2014

652

Order Number: 330061-002US

The signaling speed shall be 3.125 GBd ±100 ppm. The corresponding unit interval is 

nominally 320 ps.

The receiver shall be AC-coupled to the backplane to allow for maximum 

interoperability between various 10 Gb/s components. AC-coupling is considered to be 

part of the receiver for the purposes of this specification unless explicitly stated 

otherwise. It should be noted that there may be various methods for AC-coupling in 

actual implementations.

It is recommended that the maximum value of the coupling capacitors be limited to 4.7 

nF. This will limit the inrush currents to the receiver that could damage the receiver 

circuits when repeatedly connected to transmit modules with a higher voltage level.

Receivers shall accept differential input signal peak-to-peak amplitudes produced by 

compliant transmitters connected without attenuation to the receiver, and still meet the 

BER requirement specified in 

. Note that this may be larger than the 1200 mV differential maximum of 

 due to the actual transmitter 

output and receiver input impedances. The input impedance of a receiver can cause the 

minimum signal into a receiver to differ from that measured when the receiver is 

replaced with a 100 Ω test load. Since the channel is AC-coupled, the absolute voltage 

levels with respect to the receiver ground are dependent on the receiver 

implementation.

For frequencies from 100 MHz to 2000 MHz, the differential return loss, in dB with f in 

MHz, of the receiver shall be greater than or equal to the two equations in 

. This return loss requirement applies to 

all valid input levels. The reference impedance for differential return loss 

measurements is 100 Ω.