By using gold wires to connect the chip and electricalpads from the substrate, the substrate is known as "Wire Bond Substrate".It plays the function as the buffer between the chip and PCB. By takingthe advantage of substrates, the ability of logic gate could fan out the mostinputs to the other logic gate efficiently.
Ball Grid Array (BGA)
Chip Scale Package (CSP)
BGA: MCP, Southbridge Chipset,Communication, Networking
CSP : Memory (DRAM, Flash), Portable Device, Handset, ConsumerElectronics, PC Peripheral Device