LVDS (Low Voltage Differential Signaling) interface testing method and system based on FPGA (Field Programmable Gate Array)

Abstract

The invention provides a LVDS (Low Voltage Differential Signaling) interface testing method based on a FPGA (Field Programmable Gate Array). The LVDS interface testing method comprises the following steps: S1: through the FPGA, directly receiving a LVDS differential signal, and converting the differential signal into a single-ended signal; S2: extracting a row field signal time series from the single-ended signal; and S3: filling the row field parameter of the FPGA in advance to verify the integrity of the row field signal time series, comparing the correctness of effective data in the row field signal time series through preset data, judging that the LVDS interface is normal if the row field signal time series is integral and the effective data is correct, and otherwise, judging that the LVDS interface is abnormal. The invention also provides a LVDS interface testing system based on the FPGA, the input of hardware equipment is reduced, meanwhile, test time is saved, and test flexibility and accuracy can be improved.

Description

technical field [0001] The invention relates to the field of liquid crystal screen testing, in particular to various FPGA-based LVDS interface testing methods and systems. Background technique [0002] Most of the current processor IC chips have LVDS interface to display the LCD screen, so it is necessary to test whether the LVDS interface of the processor chip is normal before leaving the factory. [0003] LVDS (Low Voltage Differential Signaling) is a low-voltage differential signal technology interface. It is a digital video signal developed to overcome the shortcomings of high power consumption and large EMI electromagnetic interference when transmitting broadband high-bit rate data in TTL level mode. transfer method. The existing test method is to first convert the LVDS signal into a 28-bit TTL parallel signal (24-bit video data and 4 line field signals) through a dedicated LVDS receiver, and then send the 24-bit video data to the processor itself in 3 times. The came...

AI Technical Summary

Problems solved by technology

[0003] LVDS (Low Voltage Differential Signaling) is a low-voltage differential signal technology interface. It is a digital video signal developed to overcome the shortcomings of large power consumption and large EMI electromagnetic interference when transmitting broadband high-bit rate data in TTL level mode. transfer method

The existing test method is to first convert the LVDS signal into a 28-bit TTL parallel signal (24-bit video data and 4 line field signals) through a dedicated LVDS receiver, and then send the 24-bit video data to the processor itself in 3 times. The camera interface is stored in the RAM, and finally the video data in the RAM is read through the software, and the obtained video data is compared with the preset data to judge whether the LVDS interface is normal, so the implementation efficiency is low. , and it only tests the first complete signal received

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