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Fast Active Serial Configuration (Serial Configuration Devices)Figure 11–11 shows the timing waveform for the FPP configurationscheme using an enhanced configuration device.Figure 11–11. Stratix III FPP Configuration Using an Enhanced Configuration Device Timing WaveformnINIT_CONF orVCC/nCONFIGt LOEOE/nSTATUSnCS/CONF_DONEt CEt HCt LCDCLKDATA[7..0]User I/ODriven Highbyte1byte2bytent OETri-StateTri-StateUser ModeINIT_DONEt CD2UM (1)Note to Figure 11–11:(1) The initialization clock can come from the Stratix III device's internal oscillator or the CLKUSR pin.ffFor timing information, refer to the Enhanced Configuration Devices(EPC4, EPC8 and EPC16) Data Sheet in the Configuration Handbook.Device configuration options and how to create configuration files arediscussed further in the Software Settings chapter of the ConfigurationHandbook.Fast ActiveSerialConfiguration(SerialConfigurationDevices)In the fast AS configuration scheme, Stratix III devices are configuredusing a serial configuration device. These configuration devices arelow-cost devices 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.1 The largest serial configuration device currently supports64 MBits of configuration bitstream.For more information on serial configuration devices, refer to the SerialConfiguration Devices Data Sheet in the Configuration Handbook.Serial configuration devices provide a serial interface to accessconfiguration data. During device configuration, Stratix III devices readconfiguration data via the serial interface, decompress data if necessary,and configure their SRAM cells. This scheme is referred to as the AS11–30 Altera CorporationStratix III Device Handbook, Volume 1 May 2007