The DSS is a flexible composition-enabled display subsystem, that supports multiple high resolution display outputs. It consists of one Display Controller (DISPC) and one Frame Buffer Decompression Core (FBDC). The DISPC supports a multi-layer blending and transparency for each of its display outputs. The DISPC also supports a write-back pipeline with scaling to enable memory-to-memory composition and/or to capture a display output for Ethernet video encoding.
For more information, see Display Subsystem (DSS) section in Peripherals chapter in the device TRM.