Dyadic dsp instruction predecode signal selective multiplexing data from input buses to first and second plurality of functional blocks to execute main and sub operations

Abstract

Methods of performing dyadic digital signal processing (DSP) instructions. In one embodiment of the invention, the method includes fetching a dyadic DSP instruction having a main operation and a sub operation; predecoding the dyadic DSP instruction to generate predecoded instruction signals; and decoding the predecoded instruction signals to generate select signals to selectively couple data from a first plurality of buses coupled to inputs of multiplexers of a first plurality of DSP functional blocks to execute the main operation of the dyadic DSP instruction in one processor cycle and to selectively couple data from a second plurality of buses coupled to inputs of multiplexers of a second plurality of DSP functional blocks to execute the sub operation of the dyadic DSP instruction in the one processor cycle.