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Question on termination resistor position

Anonymous
Anonymous
Guru 17045 points

Hi All,

 

I would like to ask a question on termination resistor.

 

 

 

 

Is there any requirement that these resistors be placed near

1.      Output pin

2.      Or receiving (input) pin

?

 

Or they can be arbitrarily placed at anywhere on the wire?

 

In the case for DSP-DDR2 connection, I analyzed both for

1.      Address pin termination resistors

2.      Data pin termination resistors

on their

1.      sheet position (on which sheet they are drawn)

2.      PCB physical location

 

And found there is a consistency: if the termination resistor is on the sheet of DSP, then in PCB it is also close to DSP; if it is on the sheet of DDR2, then in PCB it is also close to DDR2.

 

Is this just a coincidence, or a rule I need to follow?

 

   

Thanks,

Zheng