Forum Discussion

WZhan10's avatar
WZhan10
Icon for New Contributor rankNew Contributor
7 years ago
Solved

Hi，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 ?
SengKok_L_Intel's avatar
SengKok_L_Intel
Icon for Regular Contributor rankRegular Contributor
7 years ago

​Hi,

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)