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I'm planning on utilizing the EBI interface. For my part, M487SIDAE (64 pin package), the datasheet has a pin for all 16 AD pins, except AD10. And I notice that there is 2 options for ADR19. Was this a typo, or is AD10 really not available?

For M487 series, only M487JIDAE (LQFP144) has provided all EBI pins.
M487KIDAE (LQFP128) and M487SIDAE (LQFP64) do not provide complete pins for EBI.

I get that it doesn't have all EBI pins, just seems strange that they would only have 1 out of 24 pins missing from being able to do Figure 6.30-2 (16-bit EBI data width with 16-bit device), especially if they have doubles for other pins. In fact, none of the examples shown in the EBI section can truly be achieved as shown. Missed opportunity IMO.