How works resistor-stuffing option in Cyclone V gt board between SDI Channel and HSM port A, and how change this interfaces?

Hi,

Thanks for your update. As I understand it, you are referring to the P4 and P3 output pins of FPGA. As I look at the schematic, by default, these two pins are connected to HSMC Port A through R41 and R42. There is no connection to the SDI output port on-board. Since you can only choose either SDI output or HSMC Port A at one time, if you want to connect to SDI output, you will need to remove R41 and R42 resistors, then put resistors at R45 and R46. Hope this is helpful.

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

Best regards,

Chee Pin