def write_back(read_data: Bin, alu_result: Bin, write_reg: Register,
control_signal: dict, instruction_eng):
temp = namedtuple('Write_back', ['instruction_eng'])
if (read_data is None and
alu_result is None) or write_reg is None or control_signal is None:
return temp(False)
if control_signal.pop('reg_write'):
write_data = mux([alu_result, read_data],
control_signal.pop('mem_to_reg'))
write_reg.write_data(write_data)
return temp(instruction_eng)
