Specifications

Internal 8-Bit Parallel Data
Receiver Channel Data Number
LSB PositionMSB Position
32395
40476
48557
56638
64719
727910
808711
889512
9610313
10411114
11211915
12012716
12813517
13614318
Transmitter Channel-to-Channel Skew
The receiver skew margin calculation uses the transmitter channel-to-channel skew (TCCS)—an important
parameter based on the Cyclone V transmitter in a source-synchronous differential interface:
• TCCS is the difference between the fastest and slowest data output transitions, including the T
CO
variation
and clock skew.
• For LVDS transmitters, the TimeQuest Timing Analyzer provides the TCCS value in the TCCS report
(report_TCCS) in the Quartus II compilation report, which shows TCCS values for serial output ports.
• You can also get the TCCS value from the device datasheet.
Related Information
• Cyclone V Device Datasheet
• LVDS SERDES Transmitter/Receiver (ALTLVDS_TX and ALTLVDS_RX) Megafunction User Guide
Provides more information about the LVDS Transmitter/Receiver Package Skew Compensation report
panel.
Receiver Skew Margin for LVDS Mode
In LVDS mode, use RSKM, TCCS, and sampling window (SW) specifications for high-speed source-
synchronous differential signals in the receiver data path.
The following equation expresses the relationship between RSKM, TCCS, and SW.
I/O Features in Cyclone V Devices
Altera Corporation
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CV-52005
Transmitter Channel-to-Channel Skew
5-70
2013.06.21