ZESTECH P-133 Proposal Qualcomm 6125- LVDS Deserializer

Application Scenario

LVDS signal is abnormal or disconnected When the safety chip detects that the LVDS synchronization signal and clock transmitted by the SoC are abnormal or the LVDS signal line is disconnected, the safety chip generates an external interrupt signal to notify the external MCU, and the external MCU posts an icon to remind the user that the input LVDS signal is abnormal; At the same time, the external MCU can control the safety chip to take over the display of vehicle speed and rotation speed. The Cluster instrument LVDS output signal is abnormal or disconnected When the LVDS synchronization signal and clock output by the safety chip to the display screen are abnormal or the LVDS physical wiring is disconnected, the safety chip can detect and generate an external interrupt to tell the external MCU, the external MCU can notify the IV I host and let the IV I host give a warning message to indicate that there is a problem with the Cluster instrument output. The instrument screen frozen from IV I Requires the cooperation of IV I: When the IV I outputs the instrument screen, it requires two more rows of changing pixels or a 2×2 pixel area at the beginning or end of the output screen resolution. The security chip will automatically calculate the CRC value of these two rows of pixels or 2×2 pixels (the security chip will cut off these two rows of pixels during output), and then compare it with the CRC value of the pixels in the previous frame. If the CRC value remains unchanged within the set threshold, it can be considered that the screen is stuck or frozen, and an external interrupt is generated to notify the external MCU. The external MCU controls the security chip to take over the display of vehicle speed and rotation speed. Output multiple area displays on the instrument end. To ensure that the content output is normal, the external MCU can allow the security chip to detect the CRC value of the specified coordinates and the specified area, and compare the CRC values before and after the output area. If the CRC values are inconsistent, then it can be determined that the output content has changed. There are a total of 8 area CRC values that can be set for detection at the same time. The maximum resolution of the detection area is: Detection area width + starting X coordinate ≤ 3840 Detection area height + starting Y coordinate ≤ 1282 Is the security chip icon output normal: The key indicator icon information on the car, the security chip can detect whether the indicator icon read from the flash is normal. If it is not normal, an external interrupt will be generated to the external MCU. The external MCU can allow the security chip to output the prompt content or try to control the output of the normal icon again. The working principle is to calculate the CRC value of the icon content read from the flash and compare it with the CRC value calculated by the tool on the PC. If it is inconsistent, the data content read out is incorrect and the icon display is abnormal.