Article ID: 000077577 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why doesn’t the Power-Up High logic option work for registers with synchronous clear signals in designs targetting MAX II devices?

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Description

In the Quartus® II software version 5.1 SP2 and earlier, the MAX® II register power-up high feature may not work on registers that use a synchronous clear signal. All other register configurations implement power-up high functionality correctly.   

This problem is fixed beginning with the Quartus II software version 6.0.  

As a workaround in the Quartus II software version 5.1 SP2 and earlier, use asynchronous clear inputs in place of synchronous clear inputs.  

Related Products

This article applies to 1 products

MAX® II CPLDs