What the 184 I/O and 99.4K gates mean for a board fit
The OR2T40A6PS240-DB is a Lattice Semiconductor ORCA™2 FPGA with 184 user I/O, 99,400 usable gates, and 3,600 logic cells — the I/O count is the first constraint for a board-level route: 184 signals need fan-out across several layers on a dense PCB, and the 3 V supply rail simplifies the power tree by eliminating a separate 1.8 V or 2.5 V core rail. The 57.6 Kbit on-chip RAM is sized for small FIFO buffers or register files, not large frame stores — anything beyond a few hundred bytes of local storage pushes the design to external SRAM or SDRAM.