Check PLIO placement to see if it is causing routing congestion. The most common congestion area for router is in the interface tile region. There are more PLIO channels than there are Interface Channels to connect them into the AI Engine array.
- If PLIOs are being constrained make sure adequate resources into the AI Engine array are open to handle the locked PLIOs.
- If possible limit PLIO placement near shadow regions to decrease congestion of routing resources.
- Check PLIO placement/constraints to verify that crossing such as shown in the following image is not occurring.