diff options
| author | Clifford Wolf <clifford@clifford.at> | 2018-11-13 17:30:49 +0100 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2018-11-13 17:30:49 +0100 |
| commit | caca485cfff7f999a19e86e2f00187550b0c92f4 (patch) | |
| tree | 72cd8daaedd26a352c30920e708fcbadf9b30f78 /docs | |
| parent | 51b09f2407549ced10edc831ac5d0787e492713c (diff) | |
| download | nextpnr-caca485cfff7f999a19e86e2f00187550b0c92f4.tar.gz nextpnr-caca485cfff7f999a19e86e2f00187550b0c92f4.tar.bz2 nextpnr-caca485cfff7f999a19e86e2f00187550b0c92f4.zip | |
Minor router1 debug log improvements
Signed-off-by: Clifford Wolf <clifford@clifford.at>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/faq.md | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/faq.md b/docs/faq.md index 63869240..7b358187 100644 --- a/docs/faq.md +++ b/docs/faq.md @@ -46,7 +46,8 @@ See [archapi.md](archapi.md) for a complete reference of the architecture API. ### Delay Estimates Each architecture must implement a `estimateDelay()` method that estimates the expected delay for a path from given `src` to `dst` wires. -*It is very important that this method slightly overestimates the expected delay.* Otherwise there will be performance issues with the router. +*It is very important that this method slightly overestimates the expected delay.* Furthermore, it should overestimate the expected delay +by a slightly larger margin for longer paths than for shorter paths. Otherwise there will be performance issues with the router. The delays estimates returned by that method should also be as fine-grain as possible. It definitely pays off to spend some time improving the `estimateDelay()` for your architecture once implementing small designs work. |