Accelerating speech coding standards through SystemC- synthesized SIMD and scalar accelerators

We developed parametric data-parallel and scalar instruction set extensions for accelerating the ITU-T G.723.1 and G.729.A speech coding standards. Using a novel hybrid methodology, we synthesized the custom hardware accelerators via encapsulating the C-based descriptions of the original scalar and SIMD instruction set extensions in a hybrid, SystemC- RTL hardware wrapper and introduced it into the scalar and vector extension datapaths of a next-generation configurable, extensible multi-threaded CPU. We discuss this methodology and present a VLSI implementation of a 128-bit wide configuration of the data-parallel and scalar coprocessor attached to a dual-threaded instance of this CPU.