请问Cyclone10GX的GXB引脚是100欧姆差分阻抗吗，谢谢。

Hi,

If I understand you correctly, you are inquiring if the C10GX GXB TX or RX pins support on-chip termination of 100Ohm. If yes, your understanding is correct.

The C10GX support the following on-chip termination options:

1. TX - 85 Ohm, 100 Ohm

2. RX - tristate, 85 Ohm, 100 Ohm

You may refer to the transceiver PHY user guide and look for "XCVR_C10_TX_TERM_SEL" and "XCVR_C10_RX_TERM_SEL".

Please let me know if there is any concern. Thank you.