If an RPD file contains only configuration data, why does Quartus generate differing RPD files for EPCQ and EPCQA devices? Shouldn't they be identical?

Hi Mark,

• "Program an EPCQ128A part using each of the three files above - result: 1 and 3 worked."
• "Program an EPCQ128 part using each of the three files above - result: only #2 worked."

If you refer my first post i.e. "Operation Commands " from page 4. here we can see that, in EPCQ-A devices, the dummy clock is fixed at 8 and 6 for fast read and extended quad input fast read respectively. Therefore you must regenerate the programming files, such as .pof, .jic, and .rpd. so JIC file created for EPCQ128 may not be valid but in case of EPCS devices the dummy clock is fixed at 8 for fast read, therefore you do not have to regenerate the programming files if all other conditions are met. Table 3 on page 6 defines the need to regenerate the programming files.

Could you please provide bit more information like,

1. Quartus Edition/Version used
2. Kit used

Let me know if this has helped to resolve your issue.

Regards,

Vikas