what should I do when use A10 A10 transceiver connect with xilinx K7 tranceiver all @10G？ any special external circuit to match or any other things do I need to pay attention？
As I understand it, you have some inquiries related to interfacing A10 XCVR with K7 XCVR. For your information, you would need to ensure all the A10 XCVR IO specs compatible with the K7 XCVR so that they can interface. You may cross check the specs from datasheet. For A10 specs, you may refer to the following sections in the A10 device datasheet:
1. Receiver Specifications
2. Transmitter Specifications
Please let me know if there is any concern. Thank you.