Design And Implement Of Naval Main Computing Board On The CPU Of Loongson3A

Computers are used in many fields widely.They not only provide some advantages but also help us enhance efficiency in our works.But,Central Process Unit of the computers is not homemade in China,They mostly are overseas.For example, Intel and Amd produce CPUs who are based on x86CISC architeture、Freescale produces CPUs who are based on Power pc RISC architecture. When China haves some conflicts with the other countries, it is impossible that we can not buy the overseas CPUs or gain technology supports.These circumstances will bring some bad impacts on traffic、finance、industry、national defence.To avoid these affects,China government provided many manpower and money to research technology and manufacture several kinds of CPUs included Loongson.At the same time some companies develop some coputers based on this homemaded CPUs. These computers will provide avail technical maintenances and ensurance for the above fields.In the thesis,I wrote up the features of homemaded loongson3A CPU、the ways how to expand I/O interfaces of the main computing module、the techniques how to design hardware and software、intergrate a computing system、signal integrity、the emulator of circuit.By these researchs,I conceived the scheme how to design and implement a naval ships main computing module whose CPU is Loongson3A. the features and guideline of the main computing module is complied with the standards of the equipmentsof Chinese Naval ships. It can be applied in Naval ships equipments and substitute the main computing modules whose CPU is X86architectural. It also is a Compact PCI main module.main Circuit designs of Compact PCI main module base on homemade Loongson3A CPU include designs of Power、Clock、Power on/off and Reset design、Loongson3A CPU、DDR SDRAM design、North bridge、South bridge、 network interface etc.The main board provides four RS-232serial interfaces、one standard parallel interface、two standard IDE interfaces、four standard USB2.0interfaces、one standard PS/2mouse interface、one standard PS/2keyboard interface、 one floppy drive interface、four10/100/1000Mbp ethernet network interfaces、one VGA interface、two DVI interface、two SATA interface、one audio interface. I observed some researched experiences during the course of accomplishing this subject. I realize more about Loongson3A who is an MIPS processor. During the entire course,I went across every step from design to test myself. So,if the main module is used in computing systems,I should have these abilities to solve more problems and improve the security and servicing ability of Chinese naval ships equipments.