Specifications

For LVDS receivers, the Quartus II software provides an RSKM report showing the SW, TUI, and RSKM
values for non-DPA LVDS mode:
•
You can generate the RSKM report by executing the report_RSKM command in the TimeQuest Timing
Analyzer. You can find the RSKM report in the Quartus II compilation report in the TimeQuest Timing
Analyzer section.
• To obtain the RSKM value, assign the input delay to the LVDS receiver through the constraints menu of
the TimeQuest Timing Analyzer. The input delay is determined according to the data arrival time at the
LVDS receiver port, with respect to the reference clock.
• If you set the input delay in the settings parameters for the Set Input Delay option, set the clock name
to the clock that reference the source synchronous clock that feeds the LVDS receiver.
• If you do not set any input delay in the TimeQuest Timing Analyzer, the receiver channel-to-channel
skew defaults to zero.
• You can also directly set the input delay in a Synopsys Design Constraint file (.sdc) using the
set_input_delay command.
Related Information
• LVDS SERDES Transmitter/Receiver (ALTLVDS_TX and ALTLVDS_RX) Megafunction User Guide
Provides more information about the RSKM equation and calculation.
• Quartus II TimeQuest Timing Analyzer chapter, Quartus II Development Software Handbook
Provides more information about .sdc commands and the TimeQuest Timing Analyzer.
Document Revision History
ChangesVersionDate
Updated the figure about data realignment timing to correct the data pattern
after a bit slip.
2013.06.21June 2013
• Removed 3.3 V input signal for 2.5 V V
CCIO
in the table listing the
MultiVolt I/O support.
• Added a topic about LVDS I/O restrictions and differential pad
placement rule.
• Updated the preliminary I/O counts per bank for the following packages:
• M301 packages of Cyclone V GX C5 and GT D5 devices.
• U324 package of Cyclone V GX C3 device.
• M383 packages of Cyclone V E A5, GX C5, and GT D5 devices.
• M484 packages of Cyclone V E A7, GX C7, and GT D7 devices.
• U484 packages of Cyclone V E A9, GX C9, and GT D9 devices.
• F1152 packages of Cyclone V GX C9 and GT D9 devices.
• Updated the preliminary LVDS channels counts for the M301 and M383
packages of Cyclone V E, GX, and GT devices.
2013.06.17June 2013
I/O Features in Cyclone V Devices
Altera Corporation
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Document Revision History
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