I am an undergraduate student that working on a project which need to use an ispMACH 4256ZE CPLD to implement some data transfer function in my circuit.
Need someone whoever have worked with CPLD to answer two very basic question:
For those gnd pins, do I need to connect all of them to ground? Or only some of them if I am using relative pins for in/out?
I want to use external power instead of the usb power. I see three VCCO_3.3 pin so they should be connected to 3.3 v source. But what about three other pins called VCC_EXT, VCCO_EXT_0 AND VCCO_EXT_1. Should I just connect them to groud? And is there any other pin that I need to connect it to something for external power?