The input to output and output to input routing is covered in chapters 14.2.1 and 14.2.2 in the Technical Reference Manual revision D, contained in the help\documentation folder. I built a simple project in CY8C27443 in PSoC Designer 5.1. It works as advertised. If you want to talk directly, email your phone number to firstname.lastname@example.org and I'll be happy to call.
---- Dennis Seguine