Altera Cyclone IV Device Handbook page 179

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Configuration
four devices. During the first configuration cycle, the master device reads its
configuration data from the serial configuration device while holding nCEO high. After
completing its configuration cycle, the master device drives nCE low and sends the
second copy of the configuration data to all three slave devices, configuring them
simultaneously.
The advantage of the setup in
master device. However, all the slave devices must be configured with the same .sof.
You can either compress or uncompress the .sof in this configuration method.
1
You can still use this method if the master and slave devices use the same .sof.
May 2013 Altera Corporation
Figure 8–4 is that you can have a different .sof for the
8–15
Cyclone IV Device Handbook,
Volume 1