SOPC Builder Hard IP Implementation of PCI Express Compiler Hangs when Entering L1 State

Description

When the host programs the PMCSR register at address 0x1f to the D3 state, Hard IP endpoint variants created in SOPC Builder might hang while performing the power management message handshaking protocol with the root port.

This issue affects hard IP implementations of the PCI Express MegaCore function in SOPC Builder.

Resolution

The workaround is to set test_in[7] = 1 to disable all low state power negotiations.

This issue is fixed in version 10.1 of the PCI Express MegaCore function.