Article ID: 000076363 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why is the "Phase shift step resolution" value in the altpll MegaWizard Plug In Manager different between external feedback mode and other feedback modes in Stratix III and Stratix IV devices?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

You may find that "Phase shift step resolution" value in the altpll MegaWizard™ Plug In Manager are different between external feedback mode and other feedback modes in Stratix® III and Stratix IV devices?

This is a bug in the Quartus® II software. The compensation mode should not affect the phase shift resolution.  The phase shift resolution is based on the VCO frequency of the PLL. 

This issue will be fixed in a future version of Quartus II software.

Related Products

This article applies to 3 products

Stratix® IV GT FPGA
Stratix® IV E FPGA
Stratix® IV GX FPGA