Forum Discussion
WZhan10
New Contributor
New ContributorHi，I used the PCIE HARD IP in the Cyclone IV GX starter kit, the Timequest showed that the setup SLACK is NEGATIVE(when the speed level of the device is C8).
It can be ok when I use the speed level C6.Do I have to use the C6 device if I want to use the PCIE IP ?
Hi John,
Please refer to table 9-1 below, some of the configuration is not suitable for C8 device.
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_pci_express.pdf
Regards -SK LIm
SengKok_L_Intel
Regular Contributor
Regular ContributorHi,
C8 speed grade is slower if compare with C6, and it seem like the core speed is not fast enough to process the PCIe data. For detail, need to use the timeQuest to understand the failure path and debug further.
Since the C6 speed grade is passing the timing, then it is obvious that your design need to run at faster speed grade, if this is the case, the I would suggest you to use C6.
Regards
-SK Lim (Intel)
