Altera LVDS SERDES Uživatelský manuál stáhnout pdf (Strana 22)

Data Rate: 1 Gbps, Board channel-to-channel skew = 200 ps

RCCS = 100 ps (pending characterization)

SW = 300 ps (pending characterization)

TUI = 1000 ps

Total RCCS = RCCS + Board channel-to-channel skew= 100 ps + 200 ps

= 300 ps

RSKM =

= 1000 ps - 300 ps - 300 ps

= 400 ps > 0

Because the RSKM > 0 ps, receiver non-DPA mode must work correctly.

Obtaining Accurate RSKM Results in the TimeQuest Timing Analyzer

To obtain accurate RSKM results in TimeQuest Timing Analyzer, specify your RCCS (in nanoseconds) in

the SDC file:

##########################################################################################

# Modifiable user variables

# Change these values to match your design.

##########################################################################################

set ::RCCS 0.0

Obtaining RSKM Report

For LVDS receivers, the Quartus II software provides the RSKM report showing SW, TUI or LVDS period,

and RSKM values for non-DPA mode. You can generate the RSKM report by executing the report_rskm

command in the TimeQuest Timing Analyzer.

To obtain the RSKM report, follow these steps:

1. In the Quartus II software, under the Tools menu, click TimeQuest Timing Analyzer

2. In the TimeQuest Timing Analyzer window, under Reports, select Device Specific and click Report

RSKM.

TX and Transmitter Channel-to-Channel Skew (TCCS)

For LVDS TX, the TimeQuest Timing Analyzer reports the TCCS at the I/O analysis. TCCS is the maximum

skew observed across the channels of data and TX output clock.

Altera LVDS SERDES IP Core User Guide

Altera Corporation

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Obtaining Accurate RSKM Results in the TimeQuest Timing Analyzer

2014.08.18

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Altera LVDS SERDES Uživatelský manuál Strana 22