Configuration Handbook - Kamami.pl

Configuring Stratix II & Stratix II GX DevicesTable 7–22. Dedicated Configuration Pins on the Stratix II & Stratix II GX Device (Part 4 of 10)Pin NameUser ModeConfigurationSchemePin TypeDescriptionnSTATUS(continued)If VCCPD and VCCIO are not fully powered up,the following could occur:● VCCPD and VCCIO are powered highenough for the nSTATUS buffer to functionproperly, and nSTATUS is driven low.When VCCPD and VCCIO are ramped up,POR trips, and nSTATUS is released afterPOR expires.● VCCPD and VCCIO are not powered highenough for the nSTATUS buffer to functionproperly. In this situation, nSTATUS mightappear logic high, triggering aconfiguration attempt that would failbecause POR did not yet trip. WhenVCCPD and VCCIO are powered up,nSTATUS is pulled low because POR didnot yet trip. When POR trips after VCCPDand VCCIO are powered up, nSTATUS isreleased and pulled high. At that point,reconfiguration is triggered and the deviceis configured.Altera Corporation 7–97May 2007 Stratix II Device Handbook, Volume 2