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Altera_Forum's avatar
Altera_Forum
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18 years ago

HOW to use EPM3128 to device 5v cmos?

hello ,recentely I meet a question is use EPM3128 to device 5v Cmos,and i use a pull up resistor with 5V.and in assignment editor---> use auto open drain ,but some one said maybe it is not useful for...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Your code is equivalent to the open-drain primitive. When you compile your design, the fitter report will tell you if the output is implemented as an open-drain output or not.

If you use schematics, you should insert the OPNDRN primitive in your design (before the signal goes to an output pin), instead of setting it in the Assignment Editor.