The best performance can be typically achieved by a dedicated hardware solution, while a faster design and a less expensive solution are commonly achieved by software based solutions. When the AT89C51 is executing code from external pro-gram memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. PSEN Program Store Enable is the read strobe to external pro-gram memory. Introduction Typical digital systems consist of hardware components and/or software components executing on dedicated processors. effect if the microcontroller is in external execution mode. The system proposed provides a suitable environment and an efficient solution for rapid prototyping and low cost small series production of low to medium complexity embedded digital systems. co-synthesis is guided by constraint directives added to the software-based system specification. The target architecture integrates a parameterizable 8 bit RISC microcontroller core with application specific hardware functional units able to accelerate the execution of the timing critical system components. : This paper describes a co-synthesis environment for the implementation of embedded digital systems on a single chip quick turnaround sea-of-gates technology.
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