Modern Airborne Radar I / O Interface Module

In this paper, we introduce a solution for I/O module in avation radar system bassed on the goal of integration real-time and standard. The I/O module is also an embedded system. On this module, there are 2 interefaces of RS-232 ~ 4 interefaces of RS-422 I intereface of RS-485.. 8 channels of A/D comvertion .. 8 kinds of signal interefaces and VMEbus intereface. By the way ,there are also huge memory of 512K FLASHROM~ 256K SRAM and 16K DRAM which is used to transfer message and be as an sharing data area. The CPU is at the rate of 20MHz. To realize the functions of the I/O module, we designed a scheme by using LSTI VLSI IC and standard . optimalization and founction method. At the same time, this paper talks about the theory of UART lSl(lntemal Signal Interfere) and researchs the failure reason of the ADC system and VME bus, also it has realized a solution for overcoming.and improvement. At last, we discuss and research the method of designing a VMEbus control system on CPLD (coplicated programmable logical devices).