Journal of Jinling Institute of Technology
Compared to the digital communicational system based on the SPP and RS232 ports, improved digital communicational system based on parallel ports (EPP) has higher digital communicational speed. The computer parallel ports (telecommunication mode of EPP) developed by CPLD possess lots of advantages: high speed, flexibility, powerful function (which benefits from the various internal resource of CPLD). Its customer-defined pins make it comfortable to design PCB. The paper discussed the design of WDW driver program which is specific to EPP mode; in the meantime, the paper supplied the practical examples of interface circuits based on EPP mode.