I found identical post, discussing why DelSig EOC interrupt doesn't return ADC sampling result:
But the issue appears as not being resolved. Can anyone confirm that PSoC5LP's DelSig ADC can't utilize interrupt for reading its sample value?
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Read the latest version of the DelSgiADC component data sheet. It has a whole section on the interrupts. In short, there are already ISRs available, and it seems they should be used. They also need to be anabled.
OTOH, it shoukld be possible to use the EOC signal - there is no mention of any limitations regarding its use.