How to change value set for powerdown in P1 state of PCI Express design?

Doing reference design of PCI Express design as per "ip compiler for pci express" (https://www.altera.com/literature/ug/ug_pci_express.pdf). After running simulation of the design for 212 ns got stuck with Error "Illegal value of powerdown in p1 state". How can I rectify this problem?

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