EP2AGX95EF29C6N Datasheet, PDF (272/380 Pages) Altera Corporation – Device Interfaces and Integration

8–26
Chapter 8: High-Speed Differential I/O Interfaces and DPA in Arria II Devices
Source-Synchronous Timing Budget
Figure 8–22 shows the relationship between the RSKM, TCCS, and SW.
Figure 8–22. Differential High-Speed Timing Diagram and Timing Budget for Non-DPA Mode
Timing Diagram
External
Input Clock
Internal
Clock
Time Unit Interval (TUI)
Receiver
Input Data
TCCS
RSKM
SW
TCCS
RSKM
Timing Budget
External
Clock
Internal
Clock
Synchronization
Internal
Clock
Falling Edge
TUI
Clock Placement
Transmitter
Output Data
TCCS
Receiver
Input Data
RSKM
SW
RSKM
TCCS
2
For LVDS receivers, the Quartus II software provides the RSKM report showing SW,
TUI, and RSKM values for non-DPA mode. You can generate the RSKM by executing
the report_RSKM command in the TimeQuest analyzer. You can find the RSKM
report in the Quartus II Compilation report under TimeQuest Timing Analyzer
section.
1 To obtain the RSKM value, assign an appropriate input delay to the LVDS receiver
through the TimeQuest analyzer constraints menu.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
July 2012 Altera Corporation