Configuration Handbook - Kamami.pl

Active Serial Configuration (Serial Configuration Devices)When multiple Cyclone II devices are cascaded, the compression featurecan be selectively enabled for each device in the chain. Figure 13–2depicts a chain of two Cyclone II devices. The first Cyclone II device hascompression enabled and therefore receives a compressed bitstream fromthe configuration device. The second Cyclone II device has thecompression feature disabled and receives uncompressed data.Figure 13–2. Compressed & Uncompressed Configuration Data in aProgramming FileSerial DataCompressedV CCUncompressedSerial or EnhancedConfigurationDeviceDecompressionController10 kΩDecompressionControllernCECyclone IIDevicenCEOCyclone IIDevicenCE nCEO N.C.GNDYou can generate programming files (for example, POF files) for thissetup in the Quartus II software.Active SerialConfiguration(SerialConfigurationDevices)fIn the AS configuration scheme, Cyclone II devices are configured usinga serial configuration device. These configuration devices are low-costdevices with non-volatile memory that feature a simple, four-pininterface and a small form factor. These features make serialconfiguration devices an ideal low-cost configuration solution.For more information on serial configuration devices, see the SerialConfiguration Devices Data Sheet in the Configuration Handbook.13–6 Altera CorporationCyclone II Device Handbook, Volume 1 February 2007