CUSP: A 2-μm CMOS Digital Signal Processor

This paper describes the Cornell University Signal Processor (CUSP), a 60 000 transistor 2-μm CMOS processor custom designed to compute the Fast Fourier Transform (FFT) and related algorithms. Operating on a 50-MHz clock, the bit-serial arithmetic hardware on a CUSP chip performs over 15 million 20 X 20 bit multiplications per second and computes a 1024 point FFT in 1.33 ms. The chip architecture is presented along with a description of the arithmetic, control, and fault detection circuitry. The inclusion of these components on a single chip is shown to allow large fault tolerant arrays of CUSP processors to be efficiently employed for high-performance applications.