A mask programmable DSP array

A 125000-gate 1.4-μm CMOS DSP (digital signal processor) array, which offers single-chip solutions for functions such as convolution and fast Fourier transforms, is described. High performance is obtained using full-custom RAM and multipliers, and the required system function is achieved by configuring a conventional gate array. Examples of possible applications include two standard products already designed using the DSP array. The 2-D convolver accepts video data at 40 MHz and allows an eight by eight operation window using a single device. Integration of the line stores reduces board complexity and enables the use of a lower pin-count package. The single-chip FFT integrates the data and coefficient storage and performs a 1024-point FFT in 96 μs, equivalent to 450 MIPS (millions of instructions/s)