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Why are reesistance like 100 ohm connected between CLKp and CLKn in a processor/contr

facetheash

Oct 12, 2011
3
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Oct 12, 2011
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when I reffered to a datasheet a broadcom 8 port switch.... The Pins PLL_REFCLKp and PLL_REFCLKn are connected to a 100 ohm resistance. when I referred the data sheet it says "the input has internal AC coupling capacitors which requires a 100 ohm differential termination on the board and requires a DC biasing".
Could someone explain this point
 
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