In LMX2492, in order to get a digital lock detection bit, I have set TRIG1_PIN to Inverted Pullup/Pulldown Output (value 6 on the data sheet) and set TRIG1_MUX to Output DLD (value 11 on the data sheet). However, when I set TRIG1 to Pullup/Pulldown and probe it with an oscilloscope, the pin stays high no matter what I set TRIG1_MUX to (even when it is set to ground). As a result, I cannot confirm whether the "high" observed is indicative of PLL lock detection or just a fluke. Can anyone shed any light on this? For digital lock detect, should TRIG1_PIN be set to some other form of output such as Open Drain Output or Inverted Open Drain Output?