External Memory Interface Handbook Volume 2: Design Guidelines

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ID 683385
Date 5/08/2017
Public
Document Table of Contents

2.8. Package Deskew4.2.3. Package Deskew

Trace lengths inside the device package are not uniform for all package pins. The nonuniformity of package traces can affect system timing for high frequencies. In the Quartus II software version 12.0 and later, and the Quartus Prime software, a package deskew option is available.

If you do not enable the package deskew option, the Quartus Prime software uses the package delay numbers to adjust skews on the appropriate signals; you do not need to adjust for package delays on the board traces. If you do enable the package deskew option, the Quartus Prime software does not use the package delay numbers for timing analysis, and you must deskew the package delays with the board traces for the appropriate signals for your design.

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