A Method of Synthesizing Sequence Waveform Based on DMA

Abstract

The invention discloses a sequence waveform synthesis algorithm based on DMA (Direct Memory Access). The SG-DMA (Scatter-Gather DMA) of the Altera Corporation is adopted; the key of the sequence waveform synthesis algorithm lies in the generation of a waveform sequence address; according to the algorithm, a descriptive word chain formed by multiple descriptive words is set by utilizing a descriptive word processor inside the SG-DMA and according to the requirements of different sequences on a segment number, segment repetition frequency and a circulation mode; the configuration process of a data transmission basic parameter carried by each descriptive word is completed in sequence in an embedded development process. In the process, the generation of a final sequence address is determined according to a data source to which each descriptive word points; multiple different descriptive words are connected in sequence in a form of a chain table and further point to the same data source to complete the repetition of a single sequence, and conversely point to different data sources to complete the skid among the different sequences. Compared with a conventional sequence address generation way realized through Verilog programming inside an FPGA (Field Programmable Gate Array), the sequence waveform synthesis algorithm based on the DMA, which is provided by the invention, is simple in design, low in logical complexity and further high in flexibility.

Description

technical field [0001] The invention relates to the field of signal generators, in particular to the design of the waveform output function of the signal generator, which is used to increase the waveform storage depth of the signal generator and improve the quality of output waveforms. Background technique [0002] The length and complexity of the output waveform of the baseband signal generator depends on the size of its internal memory capacity. If the storage capacity is large and the number of storage points is large, the signal waveform that can be restored is of good quality and high complexity. On the contrary, the final signal waveform may lose some detail. With the improvement of the signal transmission rate in the field of wireless communication, the modulation system used is more and more complex, and the signal bandwidth is wider and wider, the types of excitation signals used in wireless testing are also increasing, and the discrete data of excitation signals is...

AI Technical Summary

Problems solved by technology

The interrupt method is the process that the CPU suspends the currently running program when there is an event request from the external device, and then transfers to the corresponding service program for processing. However, when there are too many interrupts, the CPU is prone to failure to respond or data loss, especially for This phenomenon is particularly evident in high-speed data transmission applications

Images