Tool/software: Code Composer Studio
My problem, I'm testing two identical circuit boards, using the chip is the F28M35, one of which works and the other can't connect the emulator. I tested the circuit board that didn't work, the chip input voltage(3.3v,1.8v,1.2v) was correct and the clock (25MHz)was correct.
However the the circuit board have some problem .the A_XRSTn and B_XRSTn levels of the reset pin are 1.5V, B_X1 the corresponding clock signal is biased by 200mv DC。