Hello @rolandlawrence,
Thank you for contacting Intel Embedded Community.
You can check in RDC for the document #558579 - Intel Atom® Processor C3000 Product Family External Design Specification (EDS), Volumes 1, 2, 3, and 4
Section "26 - Customer General-Purpose I/O (GPIO)"
https://www.intel.com/content/www/us/en/secure/design/internal/content-details.html?DocID=558579
You will need a Premier account in order to get access to this document.
Best regards,
@Diego_INTEL
