In the context of the SIMCOP, multiple logical channels are required to offload the external initiator. Typical uses of multiple contexts are:
Run a read transfer followed by a write transfer. When this transfer is complete, new input data is fetched from system memory and stored in the image buffers.
Read or write YUV4:2:0 data from system memory; YUV4:2:0 data is stored in two different system memory buffers.