The address offset given for the PCI* Header Configuration Space Registers in the user guide is only a partial 12 Least Significant Bit (LSB) address offset(4 Kbytes PCIe configuration space). When using the optional Hard IP Reconfiguration block signals the full 21 bit hip_reconfig_address[20:0] must be driven.
This clarification will be added to a future release of the user guide.
To access Device Identification Registers, such as VENDOR ID etc., the MSB bit of hip_reconfig_address bus must be set to 1'b1.
#NOTE: Attempted access of undefined address space have unpredictable results and can cause the PCIe* Hard IP core to stop working, a power cycle is required to recover.