mega138Sipeed recently launched the Mega 138K Pro dev board. It’s built around the GOWIN GW5AST RISC-V FPGA and features 2x SFP+ ports, a GbE port, dual DVI interfaces, 8x 12.5Gbps Serdes, and other peripherals.Overview. Tang Mega 138K uses a 22nm process GW5AST-LV138PG484A FPGA chip, which has 138,240 lookup table units and nearly 300 DSP units. It contains eht hh