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Question on crystal connection

Anonymous
Anonymous

Hi,

 

I would like to ask a question on crystal.

 

 

 

For DM6437, I found that on Spectrum’s EVM6437 schematics R3 between crystal’s two ends is “NO-POP”. I connected as this and the chip works.

 

For another component which has only one external clock input, do I need R17 which connects crystal’s two ends together? Why? And if it is needed, how large the resistance of R17 should be?

 

 

 

 

Thanks,

Zheng