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Altera_Forum's avatar
Altera_Forum
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15 years ago

5V to 3.3V bus and vice versa

MC68000 to CycloneII There is something wrong with quickswich devices. As I know MC68000 cant support 3.3V (some versions can but mine just cant). When i use quickswich any type i only get ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

These clamping devices need low ohmic pull-up to achieve sufficient speed at the high voltage side. This may be a problem with the drive strength of MC68000. But if the bus speed requirements aren't too high, it should work.

In addition, I don't understand, why you can't generate a direction signal from the MC68000 bus control signals? Any kind of bus extenders does it.