The fabrication of the 7-nanometer chip requires the use of a 28-nanometer lithography machine and needs to be done using specialized lithography technology. First, a 28-nanometer lithography machine is used to make a circuit template on the surface of the chip, and then a 7-nanometer circuit pattern is printed on the template using lithography technology.
Finally, by customizing and assembling these circuits, they are assembled into a complete 7-nanometer chip.