Different patten when same output frequency at differernt pin. (NUCLEO-H563I)

[Cooper_WJH]

I tried to set the SPI CLK to 20MHz at VDD=1.8V, but there was no output signal at PB13. When I change to 5 MHz it returns to normal, but the waveform seems to have been filtered by the low-pass filter.  Finally, I set it to 2.5MHz to make it work stable. However, the patterns between PG11(C2) and PB13(C1) at the same frequency are different.

I want to confirm. Is that issue because the layout routing distance different between these two pins on the board? If I directly probe the IC pin, the pattern will be the same, right?

[Foued_KH]

Hello @Cooper_WJH , 

There is a speed limitation for PB13/14.
See Table67.Output timing characteristics for FT_c I/Os (PB13/PB14) . DS14258 Rev3

Foued

[QSHAO.1]

The PA7 is connected to U15 LAN8742A-CZ-TR as RMII_CRS_DV signals. You may need to remove R37 to check again the behavior on PA7. thanks!