Stimulating module for testing universal performance of serial interface

Abstract

The invention discloses a stimulating module for testing the universal performance of a serial interface. A system on chip (SOC) is used for controlling the generation of a Baud rate and providing a signal source for forming a serial communication signal; a common-mode signal generating module is used for converting two paths of digital to analogue (D / A) output signals on the SOC to generate a common-mode signal; a different-mode signal generating and amplitude controlling module is used for converting a single-ended signal output by an SOC serial port into a different-mode signal and controlling the amplitude of the different-mode signal; a different-mode signal and common-mode signal superposition module is used for superposing the common-mode signal and the different-mode signal generated by the common-mode signal generating module and the different-mode signal generating and amplitude controlling module so as to obtain an amplitude-adjustable serial communication signal; and a serial protocol chip is used for receiving a corresponding signal for the SOC. The simulating module is SOC technology-based and consists of circuits, such as the SOC, a gate circuit, an operational amplifier, a digitally controlled potentiometer and the like, and programming and offset adjustment, programming of signal amplitude and programming of word format can be realized.

Description

technical field [0001] This patent relates to the serial pass-through testing technology of electronic equipment, especially the technology of providing incentives for serial communication performance testing. Background technique [0002] At present, the existing serial communication test modules, whether they are commercial modules or self-developed modules, can only perform functional tests of products, but cannot perform performance tests. The basic items of performance testing include: electrical performance testing and format testing of words and information. [0003] In the existing communication test module, the serial communication hardware interface adopts a communication protocol chip, and the amplitude of the output serial signal (the excitation signal that can be provided) is 2v-6v, and the amplitude is not adjustable. The minimum amplitude of the excitation signal required by the performance test is 200mv, and the amplitude can be fine-tuned in steps of 10mv. ...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the existing serial communication test module can only perform functional tests of products, and only provides a fixed baud rate and the baud rate cannot be fine-tuned, and provides a serial interface general performance test excitation module, which The module can provide a programmable stimulus signal for the performance test of serial communication, which can meet the stimulus requirements of serial communication performance test

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