Data path:- It is a combination of FUs & Register file or group of registers inside CPU chip.
Data path is a network of functional & storage units capable of performing certain micro-operations and data words.
Purpose of control unit is to issue control signals to data path.
These control signals enter data path at 'Control points', where they select functions to be performed at specific times & route data through appropriate parts data part unit.
i.e CU logically reconfigure data path to implement instruction or program.
CPU's data path contains circuits to perform arithmetic and logical operations on words.