Two ways to think about logic signals
Fixed logic convention
- High voltage always means 1, TRUE, Asserted
- Low voltage always means 0, FALSE, Negated
Mixed Logic convention
- Can have High and Low true signals
- High true signals means that high voltage means 1, True, asserted
- Low true signals means that low voltage means 1, True, asserted
- In real world, have both high and low true signals.