Both the PS-GTR and PL-GTH transceivers differential clock signals (REFCLKs) must meet following signal integrity requirements.
- The target differential impedance of 100Ω.
- Match P and N differential signals to within ±0.5 mils of each other.
- REFCLK to all other signal spacing should be five times the distance between the signal to the nearest GND plane.
The Kria K26 SOM includes 0.01 μF AC coupling capacitors on the MGTREFCLKs to minimize noise and reduce power consumption.