Functionality Problem with Ultra37000V CPLD Despite Passing Simulation

Question: 1. A pin gets pulled low even though the simulation shows it correct? 2. I get daisy chain errors, why?

 

Answer:

Please check the power supply voltages. There are instances where a 5V power supply has been used on a 3.3V (V) part, and this resulted in functionality issues on a few pins. This difference in power supplies can also result in failed daisy chain errors when programming.

Please be noted our entire Cypress CPLD product are Obsolete and not recommended for new design and development. For more information on CPLD product, please visit our webpage:http://www.cypress.com/go/cpld