Hello @Imen.D, We still have this issue on certain custom boards designed in-house. We use KSZ8095 on some and KSZ8895 (5 port) on others with same base circuit over MII/MDIO.  We have tested the clock signals and they seemed to meet the STM32H7 sign...

Posted on January 08, 2014 at 03:33We just bought ST-Link to debug our software. Everything works great with Atollic and Seger J-Link with ST32F407 chip.But when we switch to ST-Link, we can flash the chip, but when start the debugger (in JTAG mode)...