Digital Signal Processor for Audio Application

Abstract

A digital signal processor for efficiently handling audio applications is disclosed. The single chip digital signal processor includes an on-chip instruction memory for outputting instructions representing an audio application program. Four busses, W, X, Y and Z, provide communication within the processor. An ALU performs a plurality of arithmetic and logical functions according to the instruction memory. Specialized implementations for functions have been specially developed for audio applications, for example, a single cycle average instruction, a jump on condition code instruction, a repeat instruction, a limit instruction. A Multiplier Accumulator/Barrel Shifter performs a plurality of MAC and shifting functions according to the instruction memory. The MAC/BS is coupled in parallel with the ALU and an Address Generator. The Address Generator performs a plurality of address calculation functions according to the instruction memory. Some of the data storage areas include: 1) a GPR memory for writing data to the X and Y busses and reading data from the Z bus; 2) an AOR memory for writing data to the W, X, and Y busses and reading data from the Z bus; and 3) an SPR memory for writing data to and reading data from the X, Y and Z busses and for outputting control information to the ALU, the MAC/BS and the AGEN.