Duringthe communication between single chip and host,
taking real-time communicationinto account,CPLDis used
for sending and receiving ARINC429signals. Define16
programmablepinsas 16-bitbidirectionaldatabus,whichis
usedfordataexchangewiththe interface chipofARINC429.
Datainformation acquiredbysingle chip is sent to CPLD
firstly, thento HS3282.WhenaARINC429signalis received
bythe CPLD,the dataarebuffereduntilCPUhasprocessed
previousdata.In this way,the systemcanreceive real-time
signalsfromARINC429bus.