A serializer/deserializer (serdes) is used to convert between high-speed serial I/O outside the chip (e.g. 100 Gbps) and lower-clocked parallel signals inside t

A serializer/deserializer (serdes) is used to convert between high-speed serial I/O outside the chip (e.g. 100 Gbps) and lower-clocked parallel signals inside the chip (e.g. 64 bits at 1.5 GHz). Using serial protocols reduces the cost and thickness of cables while parallel wires are cheaper inside the chip.