Tool/software:
When LED_SPEED pins drive the RJ45 green LED, 100M is green and 10M is not on, the probability is 0.2%, the rest are 100M is not on, 10M is on, both cases are able to communicate normally. The schematic diagram is also shown below, in which the pull-down resistance is 270Ω, and the LED_SPEED pin voltage is 1.8V when AN1 is powered on and started, it is judged to be low, if the LED_SPEED pin is 1.75V, the LED_SPEED pin is judged to be a high level 3.3V output, the voltage difference between the two is so small. Will it also be at the critical value? What is the architecture of the LED driver inside the chip that can cause such a strange problem??