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SN65DSI84: CHA_LVDS_TERM[1] for 200ohm

Part Number: SN65DSI84

Hi Team,

I have a question about CHA_LVDS_TERM[1]. As I know, LVDS signal is differential and internal resistor structure is 100ohm and we need to observe that trace impedance is 100ohm.

Could you let me know what scenario will we use 200ohm and which point should we care or rule should be followed(like trace impedance = 200ohm)? 

Roy