Testability aspects of a DSP based image processing system

The Coherent and Electro-Optics Research Group at Liverpool John Moores University has designed and developed several desktop imaging systems for industrial and medical applications. In 1991 a system based on a TMS320C30 DSP circuit board was produced to perform image correlation tasks. The board eventually demonstrated the power of the 'C30, but it also highlighted the need for new test protocols when commissioning boards with high density PGA and surface mount components. Since 1992 the group has been developing a new board based on the next generation TMS320C40 DSP. In order to minimise foreseeable development problems, the board has been designed for test using implementations of the IEE1149.1 boundary scan standard. This paper describes the imaging system, the processor board and the testability aspects associated with its development.