Configuration Handbook - Kamami.pl

Configuring Cyclone FPGAsIf the configuration bit stream size exceeds the capacity of a serialconfiguration device, you must select a larger configuration deviceand/or enable the compression feature. While configuring multipledevices, the size of the bit stream is the sum of the individual devices’configuration bit streams.Configuring Multiple Devices with the Same DataCertain applications require the configuration of multiple Cyclonedevices with the same design through a configuration bit stream or SOFfile. This can actually be done by two methods and they are shown below.For both methods, the serial configuration devices cannot be cascaded orchained together.Method 1For method 1, the serial configuration device stores two copies of the SOFfile. The first copy configures the master Cyclone device, and the secondcopy configures all the remaining slave devices concurrently. The setupis similar to Figure 13–7 where the master is setup in AS mode (MSEL=00)and the slave devices are setup in PS mode (MSEL01).To configure four identical Cyclone devices with the same SOF file, youcould setup the chain similar to the example shown in Figure 13–6, exceptconnect the three slave devices for concurrent configuration. The nCEOpin from the master device drives the nCE input pins on all three slavedevices, and the DATA and DCLK pins connect in parallel to all fourdevices. During the first configuration cycle, the master device reads itsconfiguration data from the serial configuration device while holdingnCEO high. After completing its configuration cycle, the master drivesnCE low and transmits the second copy of the configuration data to allthree slave devices, configuring them simultaneously. The advantage ofusing the setup in Figure 13–7 is you can have a different SOF file for theCyclone master device. However, all the Cyclone slave devices must beconfigured with the same SOF file.Altera Corporation 13–13January 2007 Cyclone Device Handbook, Volume 1