On 24/04/2016 7:00 AM, Jim Brain wrote: > Well, I think Terry was asking why we are all talking about CPLDs > instead of FPGAs. And, in that context, the voltage is important. FPGAs > would most likely need additional buffers to handle 5V interfacing, but > there are 5V and 5V tolerant CPLDs. CPLDs are 'simpler' versions of FPGAs if you like, and often more-than-sufficient for applications within retro 8-bit machines. FPGAs OTOH have more complex electrical requirements, such as the number of power rails (supplies) and decoupling that preclude them from simple projects. And yes, generally you can't interface FPGAs directly to 5V logic, whereas some CPLD families (fast disappearing) are tolerant of 5V signalling. Regards, -- | Mark McDougall | "Electrical Engineers do it | <http://members.iinet.net.au/~msmcdoug> | with less resistance!" Message was sent through the cbm-hackers mailing listReceived on 2016-04-24 00:00:21
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