mega138Hardware Resources. Board Specification Board Schematic PCB BOM Board Dimension Diagram Board 3D Model Some Chip Manuals. Getting Started. Note that 138KSipeed 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.