These criteria must be met when choosing an oscillator for a design with GTM transceivers:
- Provide AC coupling between the oscillator output pins and the dedicated GTM transceiver Quad clock input pins.
- Ensure that the differential voltage swing of the reference clock is the range as specified in the Versal device data sheets.
- Meet or exceed the reference clock characteristics as specified in the Versal device data sheets.
- Meet or exceed the reference clock characteristics as specified in the standard for which the GTM transceiver provides physical layer support.
- Fulfill the oscillator vendor's requirement regarding power supply, board layout, and noise specification.
- Provide a dedicated point-to-point connection between the oscillator and GTM transceiver Quad clock input pins.
- Keep impedance discontinuities on the differential transmission lines to a minimum (impedance discontinuities generate jitter).