Configuration Handbook - Kamami.pl

Device Configuration PinsTable 7–22. Dedicated Configuration Pins on the Stratix II & Stratix II GX Device (Part 9 of 10)Pin NameUser ModeConfigurationSchemePin TypeDescriptionnRS I/O PPA Input Read strobe input. A low input directs thedevice to drive the RDYnBSY signal on theDATA7 pin.If the nRS pin is not used in PPA mode, itshould be tied high. In non-PPA schemes, itfunctions as a user I/O during configuration,which means it is tri-stated.After PPA configuration, nRS is available as auser I/O pin and the state of this pin dependson the Dual-Purpose Pin settings.RDYnBSY I/O PPA Output Ready output. A high output indicates that thetarget device is ready to accept another databyte. A low output indicates that the targetdevice is busy and not ready to receiveanother data byte.In PPA configuration schemes, this pin willdrive out high after power-up, beforeconfiguration and after configuration beforeentering user-mode. In non-PPA schemes, itfunctions as a user I/O pin duringconfiguration, which means it is tri-stated.After PPA configuration, RDYnBSY isavailable as a user I/O pin and the state of thispin depends on the Dual-Purpose Pinsettings.7–102 Altera CorporationStratix II Device Handbook, Volume 2 May 2007