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UCC2897A: What is ENABLE signal / When does switching start

Part Number: UCC2897A

Hello Team,

In the datasheet p12, what's ENABLE waveform referring to?

As per description in datasheet below, PWM pulse will be inactive during the standby mode (I understand 'standby mode' is referring to the period that VDD is repeating charging and discharging by JFET). But as per figure 19, PWM pulse is active in accordance to ENABLE, even during the standby mode period. 

Could you please clarify when PWM pulse starts to appear?

Thank you.