The GS9021 implements error detection and handling (EDH) according to SMPTE RP-165. Interfacing to the parallel inputs of either the GS9002, GS9022 or GS9032 serial digital encoders, the GS9021 is primarily used on the transmit end of the SDI interface. The GS9021 provides EDH insertion and extraction for 4sc NTSC, 4sc PAL and all component PAL and NTSC standards including 4:2:2 (13.5MHz and 18MHz luminance sampling), and 4:4:4:4.