This occurs when the driver pin and sink pin are part of the same site,
but not reachable with site routing only.
Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
- Finishes implementation of SiteArch::nameOfPip and SiteArch::nameOfWire
- Adds "explain_bel_status", which should be an exhaustive diagnostic
of the status of a BEL placement.
Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
Fixes:
- Only use map constant pins during routing, and not during placement.
- Unmapped cell ports have no BEL pins.
- Fix SiteRouter congestion not taking into account initial expansion.
- Fix psuedo-site pip output.
Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
