The HSP43891/883 is a video-speed Digital Filter (DF) designed to efficiently implement vector operations such as FIR digital filters. It is comprised of eight filter cells cascaded internally and a shift and add output stage, all in a single integrated circuit. Each filter cell contains a 9 x 9 two's complement multiplier, three decimation registers and a 26bit accumulator. The output stage contains an additional 26bit accumulator which can add the contents of any filter cell accumulator to the output stage accumulator shifted right by 8-bits. The HSP43891/883 has a maximum sample rate of 25.6MHz. The effective multiply-accumulate (mac) rate is 204MHz.