Portable Digital Storage Oscilloscope Hardware Platform Based On Arm And Cpld Design

It is one of the directions of modern oscilloscope development that the portable digital storage oscilloscope, the market potential is enormous, but because its technological content is extremely high, by the look of known situation at present, though there is research in this respect at home, there are no national products to go on the market, It is a field concerned by a lot of eyes in testing the instrument. ARM is 32 bits RISC processor, high performance, low consumption are its remarkable characteristic, have already widely used in various kinds of embedded fields. CPLD is complicated programmable logic device, with its fast> stability higb, designing flexible and cheap, become the best choice of designing numerical control system.Because of this, the paper has proposed a kind of hardware platform design plan of the portable digital storage oscilloscope based on ARM +CPLD structure. CPLD is responsible for front channels controlling, data gathering and the hardware pretreatment of data—The redundant data lost by hardware, ARM is responsible for the back end waveform rebuilding, displaying and the data storing for ever. The control chip of the systematic front, we select Altera Company's MAX II series for use that is the most new generation high performance , low consumption CPLD chip — EPM1270T144C3, the systematic back end ARM processor, we select Samsung Company's the multi-functional, low consumption ARM chip based on ARM7TDMI-S kernel--S3C44B0X, the system utilizes black-and-white LCD as the terminal display device, to utilize the hard disk or CF card based on IDE interface to store the waveform data for ever, in order to make it convenient for developping and debugging, system designs JTAG debugging interface , all of this form an intact hardware platform.The thesis has introduced the operation principle of every main function module sequentially according to the flow direction of the signal, implementation method, and detailed circuit diagram and PCB diagram. Finally, through comparing with the design object established in advance, analysed to every technical indicator of the hardware platform.