A high performance digital signal processor VLSI: MN 1900 series

This paper describes a high performance digital signal processor VLSI, the MN1900 series, developed for advanced applications such as high quality bit rate reduction coding. The MN1900 series uses 2-micron double-layer aluminium CMOS technology and fabricates a powerful digital signal processing system on a silicon chip. The arithmetic unit providing high accuracy and wide dynamic range processing consists of a 20 × 20-bit multiplier, a 24-bit arithmetic and logical operation unit, and a barrel shifter. The data memory is constructed of a 16-bit × 66-word internal RAM and 16-bit × 4k-word external RAM, and the addressing mode for these RAMs is powerful. The I/O facilities contain a 2- channel DMA controller, thus avoiding troublesome I/O handling of the program. The powerful program control facilities support a nested loop program, subroutine call and three kinds of interrupts.