PCIe signal bandwidth determination method, device and equipment

Abstract

The invention discloses a PCIe signal bandwidth determination method and device, equipment and a computer readable storage medium. The method comprises the following steps: testing to obtain a target frequency point at which the energy spectrum density of a PCIe signal of a to-be-tested transmission link after an output signal of the to-be-tested transmission link is subjected to inverse Fourier transform reaches a preset proportion (determined according to a measurement error demand of the to-be-tested transmission link) of an original signal, and taking the target frequency point as the bandwidth of the PCIe signal of the to-be-tested transmission link; therefore, accurate high-speed signal bandwidth selection is realized; in order to measure the target frequency point, the insertion loss of the standard PCIe signal on the analog transmission link is obtained through testing in advance, and after the insertion loss of the transmission link to be tested is determined, the target analog transmission link is selected to simulate the transmission link to be tested for testing, so the test of signal bandwidth selection is completed in the design stage of the to-be-tested transmission link, and accordingly reasonable selection of PCIe signal bandwidth is realized.

Description

technical field [0001] The present application relates to the technical field of signal transmission, in particular to a method, device, equipment and computer-readable storage medium for determining the bandwidth of a PCIe signal. Background technique [0002] In the low-speed era with a clock frequency of kHz or only tens of MHz, electronic engineers mainly focus on the design of circuit functions and logic, thinking that "0" and "1" code streams can be accurately transmitted to the computer through voltage or current waveforms. The receiving end is accurately judged by the receiving end, but with the continuous improvement of the operating frequency of the circuit, although the information transmitted by the "0" and "1" code stream is digital, the voltage or current waveform carrying this information is For analog, various factors such as noise, loss, and unstable power supply will distort the voltage or current waveform. If the distortion is serious to a certain extent, ...

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Problems solved by technology

[0005] But at the same time, when system manufacturers such as the server industry have more requirements for configuration of peripherals (CEM), the channel loss is also increasing. After the signal at the sending end passes through a large link loss, the high The frequency signal will be greatly suppressed, which will lead to the fact that the actual bandwidth requirement often does not need to be as large as three times the frequency of the sine wave. If the rule of thumb is followed, the signal-to-noise ratio of the measured signal will be reduced (the higher the bandwidth, The higher the noise floor); on the other hand, the oscilloscope, which must be used in signal integrity verification, will become more and more expensive as the bandwidth increases, such as the 50GHz high-bandwidth precision oscilloscope currently used The unit price of an oscilloscope has reached more than 5 million. In the process of product development, every company basically has multiple projects developed in parallel, which also leads to the frequent shortage of equipment resources per capita. If you purchase multiple high-end oscilloscopes Solving this problem will inevitably bring greater research and development expenses to the company

[0006] It can be seen that this method of selecting PCIe signal bandwidth by empirical method has increasingly exposed the problem of unreasonable bandwidth setting

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