1.3. Signal Detect Issue in PCIe Configuration
The Signal Detect (SD) circuit required in PCIe Configuration (Hard IP and PIPE mode) may switch OFF under the following conditions:
- Low temperature
- Upper limit of VCCER_GXB (receiver buffer power supply voltage)
PCIe link training may not be fully completed in the case where the SD circuit remains de-asserted or remains OFF with an incoming signal.
This issue is a time-zero condition. If shipped devices have been tested not to show this issue initially, it will not show in the future.
Update the Intel® Quartus® Prime settings for receiver common mode voltage (RX Vcm) and receiver signal detect circuit threshold (RX Vth) settings as shown in the following table.
|RX Vcm Voltage
|RX Vth Settings
|Cyclone® V GT/ST
To update RX Vcm and RX Vth settings, refer to the KDB solution.
If you are unable to make changes to resolve the issue, contact Intel® Premier Support for additional information.
Affects: Cyclone® V GT/ST devices
There is no planned fix for this issue.