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Are 22 ohm ballast resistors always needed ?

Question asked by snoopy on Mar 1, 2012
Latest reply on Mar 8, 2012 by snoopy

I noticed on the EZ Kit eval board for the ADSP-21489 that there are 22 ohm resistors on nearly every pin of the DSP. Are these always needed or is this to reduce the ringing on long trace lengths and external buses ?