Why DE10-Standard hasn't transceiver on HSMC
From Terasic Wiki
Q: Why DE10-Standard equipped with Cyclone V SX FPGA, but no transceiver on HSMC?
A: It requires additional clock gen if add transceiver on HSMC, also more PCB layer is needed and cost will increase, consider that most of users won't use transceiver, so the board isn't implement the transceiver.
