Hi Dear KlausSt,
my question is about reason of using CPLD, I'm wondering why is CPLD used? why is cpld used such as a bridge between FPGA and other IC?
I know my question is general and thank you for your response. I'm confused about using CPLD on FPGA board. I don't know why do pins of a chip like wiznet W5300(Ethernet controller) need a CPLD to connect I/O pins of vertix6lx130t? I saw in schematic of my board that wiznet pins connect to a CPLD and then CPLD pins connect to FPGA. what's the matter with directly connection of FPGA pins and wiznet pins? why is CPLD used?