The Design Of Data Acquisition Card Based PCI Bus

Almost every modern electronic system faces the problem of computing and processing of a mass of high-speed and data. In many fields, such as radar, communication, sonar, image, intelligent instrument and so on, design and application of high-speed data acquisition system is necessary to acquire data in very shot time. Data acquisition board is the heart of a data acquisition system and, playing a very important role in a system.In the thesis, each function module and prevalent technology on a data acquisition board is investigated detailed, and the hardware design of a high speed data acquisition board is achieved. The following is the main content:1. The principle of signal adjustment channel and trig channel are investigated, and its hardware design is realized .Signal can be sampled at 200MSa/s with 12 bit vertical resolution. And trig function is also available.2. High-speed and huge capacity of memory is investigated. DDR SDRAM is taken as the memory for it high performance. The design of DDR SDRAM and its related circuit is investigated, as well as the signal integrity problem of it. Commands and parameter and principle of DDR is introduced, and a kind of FPGA based DDR controller is realized, with the function of initialization, refreshing and reading/writing. Simulation and debugging results are also supplied.32MB memory capacity is achieved and can be timed easily.3. High-speed data transferring is investigated. For higher performance and better compatibility, PCI bus is taken as the data transferring interface to PC. A kind of FPGA based Local bus controller is investigated, and high-speed data transferring is achieved.