Data sampling point determination method and device

Abstract

The invention discloses a data sampling point determination method and device, and the method comprises the steps: carrying out the phase edge division operation of a sampling clock based on the rising edge of the sampling clock and the falling edge of the sampling clock, and obtaining a preset number of sampling phase edges; and collecting target data sent by the external device according to all the sampling phase edges to obtain a transmission start identifier corresponding to the target data, and determining sampling points of the target data according to the transmission start identifier and all the sampling phase edges. It can be seen that the sampling clock is divided by combining the rising edge and the falling edge of the sampling clock, and sampling is carried out based on the multiple phase edges of the divided sampling clock corresponding to the data at the same time, so that the determination operation of the sampling points of the data can be simplified, and the determination efficiency and accuracy of the sampling points of the data can be improved; and the rising edge and the falling edge of the sampling clock are combined to sample the data, so that the sampling frequency of the clock can be reduced, and the realization difficulty and the power consumption of hardware can be reduced.

Description

technical field [0001] The invention relates to the technical field of data processing, in particular to a method and device for determining data sampling points. Background technique [0002] In the SOC (System-on-a-Chip) chip, there are peripheral interfaces using different protocols (for example: MASTER / SPI / UART / NAND FLASH / SD / EMMC, etc.), and the SOC communicates with external devices by using these peripheral interfaces to interact. In practical applications, the peripheral interface of the SOC chip is usually MASTER, the external device of the SOC chip is the SLAVER, and the working clock of the external device is generally provided by the SOC terminal of the SOC chip, and the data returned by the external device is usually without a clock. Therefore, the SOC interface controller of the SOC chip is required to be responsible for data sampling. [0003] At present, the method of determining the sampling point of the SOC interface controller data is generally: adjust th...

AI Technical Summary

Problems solved by technology

However, it has been found in practice that the software flow of this method is relatively complicated, the determination of sampling points is inefficient and accurate, and due to various factors (such as: chip differences, environment and chip temperature changes, operating voltage, operating frequency, PCB layout and external The impact of differences in connecting devices, etc.) can easily cause the sampling point to float out of the sampling window, resulting in the failure of the sampling point, thereby affecting the stability of data transmission and reducing the efficiency of data transmission

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