Cyclone® 10 GX Core Fabric and General Purpose I/Os Handbook

ID 683775
Date 7/08/2024
Public
Document Table of Contents

5.6.7.1.3. Transmitter Channel-to-Channel Skew

The receiver skew margin calculation uses the transmitter channel-to-channel skew (TCCS)—an important parameter based on the FPGA transmitter in a source-synchronous differential interface:

  • TCCS is the difference between the fastest and slowest data output transitions, including the TCO variation and clock skew.
  • For LVDS transmitters, the Timing Analyzer provides the TCCS value in the TCCS report (report_TCCS) in the Quartus® Prime Pro Edition compilation report. The TCCS report lists the TCCS values for serial output ports.
  • You can also get the TCCS value from the device datasheet.

Perform PCB trace compensation to adjust the trace length of each LVDS channel to improve channel-to-channel skew when interfacing with non-DPA receivers at data rate above 840 Mbps.

The Quartus® Prime Pro Edition Fitter report lists the amount of delay you must add to each trace.

The LVDS Transmitter/Receiver Package Skew Compensation report lists the recommended trace delay numbers. Using these numbers, you can manually compensate the skew on the PCB board trace to reduce the channel-to-channel skew and meet the timing budget between the LVDS channels.