5.11.1.1 Creating a Block

The Designer-Block specific PDC command set_port_block enables you to remove an I/O connected to a component port and add a buffer before or after a component port to limit the fanout of the port net. The command applies only to the selected port.

The tribuf and bibuf I/Os cannot be removed.

Adding a buffer enables more precise Designer Block timing, since the nets driving ports are not preserved when the Designer Block is generated/published.