AR# 35033: Design Assistant for PCI Express - Device is recognized by system, but problems occur
Design Assistant for PCI Express - Device is recognized by system, but problems occur
This answer record identifies possible problems if your device is recognized by hardware but not operating correctly.
Note: This Answer Record is a part of the Xilinx Solution Center for PCI Express(Xilinx Answer 34536). TheXilinx Solution Center for PCI Express is available to address all questions related to PCIe. Whether you are starting a new design with PCIe or troubleshooting a problem, use the Solution Center for PCIeto guide you to the right information.
Once the system is operational, see (Xilinx Answer 35000) regarding removing power, reconfiguring or unplugging the endpoint.
Possible Causes of System Hangs
If the user does not use the trn_trem_n signal properly, it is possible that malformed TLPs can be transmitted which could cause a fatal error on the receiving device. See (Xilinx Answer 35748).
See (Xilinx Answer 35034) regarding completion timeouts. Causing a completion timeout by not responding to incoming memory reads may hang the system.