An Experiment Design for Measuring Processing Sequence of FPGA Statements

The mechanism of statement processing in FPGA is different from that in micro-processor. Statements are usually executed in parallel in FPGA, but they are done in series in processor. Moreover, "signal" and "variable" in FPGA are also executed differently. Because of conventional thought of series processing sequence in computer, mistakes are often made in analyzing processing sequence of FPGA statements. In this paper, some typical experiment cases are designed ingeniously to analyze the processing sequence of FPGA statements. Through experiment comparisons, some unexpected results are accquired. These experiment cases can demonstrate the sequence very clearly. A conclusion can be drawn that different processing sequences may lead to different results. So the processing sequence of FPGA statements is extremely important to signal processing. Therefore, more importance should be attached to the processing sequence of FPGA statements in FPGA digital system.