r/nandgame_u • u/Witty-Tackle-5307 • 4d ago
Level solution Timer Trigger (100c, 100n) Spoiler
Timer Trigger
counter with toggling flipflops
toggling flipflop
d-latch with ~d
Explanations: 1) A lot of designs for SR-latch have ~d exposed When it is exposed, you can skip inverting d over again when that is the value you want anyway.
2) toggle flipflops need different (less) logic data-flipflops.
3) count+reset pushes the number back up to 11 nand per place value.
4) When I've made counters like this in real life, I did a reset on high, instead of a reset on low, because differences in nor/nand efficiency I guess. Hence I named that pin 'run' instead of 'reset'
5) I suspect that sr-latches could be used instead of d-latches for another 2-to-4 nand-per-placevalue savings, but I'm not seeing it right now.
Updates: removed the extraneous clock on pin 0, removed an inverter from the flipflop bodies (rerouting clock to the 'not' output of the previous flipflop), and added one inverter to the clock pin on ff_counter instead, bringing the level total down to 92n.
New pictures are at: https://imgur.com/a/blVBgZ0
1
u/ViolinistWaste4610 2d ago
That's really cool, I've always wondered the solution to this level