3 ms·
> Stefan’s paper asks what would happen if we could just stick a direct wire between certain pairs of LUTs, like you can when designing fully-custom hardware. I
by Treblemaker 7y ago
> Stefan’s paper asks what would happen if we could just stick a direct wire between certain pairs of LUTs, like you can when designing fully-custom hardware. It’s a hypothetical question, of course, because FPGAs don’t actually allow this.
Granted, it's been almost 30 years since I touched an FPGA, but are Long-Lines not a thing anymore? They were a limited resource, but as I recall they did make it possible to make fast long-distance connections.
- wrinklytidbits 7y agoDo you mean twisted pairs?
- bisrig 7y agoI don't think that long lines scaled particularly well with increasing number of LUTs and clock rates. All the black magic voodoo that goes into matching prop delay for resources like that tends to be applied to clock distribution. At least that's how it was a few years ago.
- dooglius 7y agoThis is more about making fast short-distance connections.