Jeff Condit wrote:
Hi AJ!
I meant P98SE.
I guess what I was balking at was not being able to reconfigure a pin's electrical type from schematic. The reason is that generic PLDs don't really have an electrical type until they are programmed. Then the pins can become inputs, outputs, tri-state, or whatever you want. If in the library they are all just set to I/O, then the schematic reports a lot of warnings and can miss some errors. If you know what you want the pins to be (which is only sometimes the case) and can set the pin electrical types accordingly, then the ERC is much more meaningful. This could be done in the parts editor, but then the part would be wrong on other designs where the pins are used differently. Thus, the desire to be able to characterize them in schematic.
Anyway, that was the thought.
Jeff Condit
For large programmable parts like Altera's FPGAs, I make a special schematic symbol for each application, with the pins named and positioned (and set the the correct type) to suit the application. I find it much easier to understand the schematic with the pins named for their functions, rather than all being called "I/On"
-- Peter Bennett TRIUMF 4004 Wesbrook Mall, Vancouver, BC, Canada GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
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