Configuration Handbook - Kamami.pl

Configuring Stratix & Stratix GX DevicesTable 11–15. Dedicated Configuration Pins on the Stratix or Stratix GX Device (Part 7 of 8)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 and the state of this pin depends onthe 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 receive anotherdata byte.In PPA configuration schemes, this pin drivesout high after power-up, before configurationand after configuration before entering usermode.In non-PPA schemes, it functions as auser I/O during configuration, which means it istri-stated.After PPA configuration, RDYnBSY is availableas a user I/O and the state of this pin dependson the Dual-Purpose Pin settings.Altera Corporation 11–57July 2005 Stratix Device Handbook, Volume 2