According to ADuC7026 datasheet,
nRS signal rising time is specified 0-4ns delay than ECLK rising time.
But the customer measured nRS rising time is about 5ns faster than external Xtal (40MHz) rising time.
I would like to know:
Each ECLK on timing specifications are based on ECLK pin out? (when using external Xtal like above 40MHz Xtal)
Thank you for your help in advance.