[SI-LIST] Re: PCIX AND Tprop




Tprop is the propogation delay. Td is the velocity of the wave in the microstrip

Hence trace length = Tprop/Td = 2000/175 inch = 11 inch. 

What is missing is your rise time which will give your electrical length to 
compare against your trace length. This will also give your max. trace length 
where you won't have to worry about reflection. Anything above that requires 
termination of some sort to prevent reflections


--- On Wed 05/22, Brahim Koudssi  wrote:

Hello SI Group,


Please help me understand the definition of Tprop and how to calculate
the Max. trace length?

PCIX at fclk=133 mhz

Tprop=2ns

Td= 175ps/in

Thanks,

Brahim Koudssi


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