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Below are screenshot of the MDC and MDIO signals from the USB Dongle from the TLK10232 Development kit. I am having issues talking to the TLK10232 and want to verify that the mdc and mdio signals are correct. The MDC clock doesn't look periodic with 50% duty cycle. Is this okay?
Hi Thao,
Are you trying to connect the USB dongle from the TLK10232EVM kit to your own board which includes the TLK10232 right?
As well, since the MDIO protocol requires pullup resistors, there may be a conflict of having pullup resistors on the dongle and on the system board.
The pullup issue won´t have an impact on the GUI recognizing the hardware, they might have issues with the MDIO communications as a result of the pullups.
Best Regards,
Luis Omar Morán Serna
High Speed Interface
SWAT Team
Correct. I'm connecting the USB dongle to our board with the TLK10232. We're going through a bidirectional level shifter to get to the 1.8V I/O on the TLK10232. The plot I've attached is only the usb dongle with nothing else attached. Does the MDC look correct?
Thao
Hi Thao,
1. Do you have anything connected to the USB dongle (any load)? Or are you just measuring to the MDC and MDIO signals in the USB dongle connected to the PC?
2. Also, have you tried with another probes? Is posible there is an issue with hook up.
Best Regards,
Luis
Hi Thao,
Do I understand you correctly in you are trying to wire the USB dongle directly to your board and not run it through the TLK10232 EVM first? If you are doing this, then you must use a bi-directional level shifter on their application board because the USB MCU signals are 3.3V levels and the TLK10232 requires the 1.5V or 1.8V levels depending upon their board configuration. If you do not have a bi-directional level shifter in the signal path between the USB MCU and the TLK10232, then the signal levels alone will prevent any MDIO communication. Is there a way we can get a schematic, picture, and or diagram of your setup to provide a better feedback?
Best Regards,
Luis Omar Morán Serna
High Speed Interface
SWAT Team