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SN65DSI84: lvds clock no out

Part Number: SN65DSI84

 test mode,

ref clock =DSI clock

Will LVDS clock  be active only when dsi clock is active?

When DSI clock is active,measuring LVDS Clock, LVDS Clock stays 1.2V common voltage,but no swing voltage.  Reg 0x19=00;

I want to know :

If LVDS Clock has Common Voltage 1.2V,does it meen that the lvds clock is active?  At this time LVDS clock must have a swing Voltage?