Re: [SI-LIST] : Signal Integrity of 500 MHz on PCB

Mike Jenkins (jenkins@lsil.com)
Thu, 06 Nov 1997 12:27:07 -0800

On the question of propagating a 500 MHz clock across an FR4 board,
Fibre Channel and Gigabit Ethernet designs ship sub-nanosecond
pulses across boards routinely. The fastest continuous frequency
in such a data stream is, in fact, slightly over 500 MHz. What
makes this work is 1) differential signals, 2) point-to-point
signal paths only, and 3) doubly terminated nets. If your
application can afford these constraints, I believe propagating
a 500 MHz clock is feasible.

Hope that helps.

Mike Jenkins

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Mike Jenkins               Phone: 408.433.7901            _____     
 LSI Logic Corp, ms/G750      Fax: 408.433.2840        LSI|LOGIC| (R)   
 1525 McCarthy Blvd.       mailto:jenkins@lsil.com        |     |     
 Milpitas, CA  95035         http://www.lsilogic.com      |_____|    
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~