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