FFT transforms are configured using the Configuration channel. The configuration information carried in this channel, and how it is packed, is discussed in more detail in Configuration Channel . When the core is ready to load a new frame for processing, it checks to see if a new configuration has been supplied on the Configuration channel. If it has, the FFT processing core is configured using that information before the frame is loaded. If no new configuration information has been supplied then the core processes the frame using the last configuration it had. If no configuration has ever been supplied, then the core defaults described in Resets are used.
The process of applying configuration data to a particular frame depends on the current status of the core:
1. To apply a configuration to the very first frame after power on or after an idle period
2. To apply the configuration to the next frame in a sequence of frames