【摘要】 针对并行口设备开发的趋势及特点 ,详细介绍了 EPP协议的产生、特点及时序 ;并结合科研项目“ES2 42 0地震仪改造”提出了用 EPP协议仿 Intel 80 86系统接口的详细设计方案 ,该接口由读写逻辑生成电路、地址锁存器及译码器、仿 Intel 80 86总线及一些逻辑延时电路组成。并给出了电路框图及 Windows3 .x/95/98编程。经扩展后总线的双向通信速度为 850 KB/s与 ISA总线的速度相当。更多还原

【Abstract】 According to parallel device development’s character and trend,this article introduces the EPP protocol’s creation,character and order in detail,and brings forward a particular design project using the EPP protocol,resembling the 8086 system interface and combining the scientific research project ES2420 earthquake apparatus rebuilding.This interface is composed of read write logic circuit,address latch and code translate device,resembles the 8086 system and some logic time delay circuit and brings out the circuit pictures and the programming of Windows 3.x/95/98. The Double direction communicating speed of extended bus is 850 KB/s,which is the same as that of the ISA bus.更多还原