Configuration Handbook - Kamami.pl

Passive Serial ConfigurationPS Configuration Using a MAX II Device as an External HostIn this configuration scheme, you can use a MAX II device as anintelligent host that controls the transfer of configuration data from astorage device, such as flash memory, to the target Stratix III device. Youcan store configuration data in .rbf, .hex, or .ttf format. Figure 11–17shows the configuration interface connections between a Stratix III deviceand a MAX II device for single device configuration.Figure 11–17. Single Device PS Configuration Using an External HostMemoryADDRDATA0(1) VCC VCC (1)10 kΩ 10 kΩStratix III DeviceCONF_DONEnSTATUSnCEExternal Host(MAX II Device orMicroprocessor)GNDnCEODATA0 MSEL2nCONFIG MSEL1DCLKMSEL0N.C.V CCNote to Figure 11–17:(1) Connect the pull-up resistor to a supply that provides an acceptable input signalfor the device. V CC should be high enough to meet the V IH specification of the I/Oon the device and the external host.GNDUpon power-up, Stratix III devices go through a POR. The POR delay isdependent on the PORSEL pin setting. When PORSEL is driven low, thePOR time is approximately 100 ms. When PORSEL is driven high, thePOR time is approximately 12 ms. During POR, the device resets, holdsnSTATUS low, and tri-states all user I/O pins. Once the devicesuccessfully exits POR, all user I/O pins continue to be tri-stated. IfnIO_pullup is driven low during power-up and configuration, the userI/O pins and dual-purpose I/O pins will have weak pull-up resistorswhich are on (after POR) before and during configuration. IfnIO_pullup is driven high, the weak pull-up resistors are disabled.The configuration cycle consists of three stages: reset, configuration, andinitialization. While nCONFIG or nSTATUS are low, the device is in reset.To initiate configuration, the MAX II device must generate a low-to-hightransition on the nCONFIG pin.11–42 Altera CorporationStratix III Device Handbook, Volume 1 May 2007