Forum Discussion
Altera_Forum
Honored Contributor
13 years agoCan you elaborate on what you are looking for as far as place-and-route.
For timing models, there is no spreadsheet or anything like that which gives all the values. Take a look at: http://www.altera.com/literature/wp/wp-01139-timing-model.pdf (My TimeQuest User Guide has a section on timing models too) It's really complex though. As mentioned, there is basically a mini spice-like simulator calculating values based on all sorts of parameters, so it's not like an element has a single delay value(for example, the same length routing wires can have different delays). Delays through a LUT vary by quite a bit depending on the input. Then there's on-die variation and rise/fall variation. It's just a lot of stuff going on, and can't be incorporated in a datasheet or something like that. Fitting a real design and looking at the timing is by far the best way(it gives you exact stuff to look at that is relevant to your design, while leaving out stuff that isn't). There's also many other layers. Synthesis, place and route and the many things they encompass all have such an affect on timing, it's really hard to separate one from the other. I've done analysis on designs that run faster/slower in different architectures in unexpected ways, and there's almost never a single smoking gun that explains it.