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AM5728: Setup/hold time thresholds

Part Number: AM5728

After read datasheet 7.3.1.1, I want to understand below on AM5728:

1. setup time or hold time measurment is based on figure 7-2? both CLK and DATA threshold is set at 50% leve?  I saw some IC require the CLK set at 50% level, while DATA set at VIH(min)/VIL(max) level.

2. CLK high duration, low duration measurement is based on figure 7-2 or figure 7-3?