As I'm working on build the tusb1310A board but failed check the ULPI clock (about 90MHz) and PIPE3 clock( no working clock ).
All the strap in I set no pull up/down resistor.
I measured some of the strap pins' voltage,
RX_ELECIDLE=0;
REFCLKSEL1=0;
REFCLKSEL0=0;
Now the crystal is 20Mhz crystal( work normally at other board).
Very strange, after I powered on this 1310A board, I measured a 30M Hz clock at the 24MHz crystal pin( 1310A's XO pin);
Could anyone help about this special abnormal case?
Does the strap pin can be set 0/1 by connect a pull down/up resistor?
Or how can i set the strap pin?