- 2071 Bhadra · 2 marks
Datapath versus control unit
Short answer
The datapath performs data operations using registers, ALU, and buses under the direction of control signals. The control unit sequences operations as a finite state machine, generating these signals based on opcodes and status flags. The datapath is data-oriented; the controller is sequencing logic.
What are the differences between datapath and control unit?
| Point | Datapath | Control unit (controller) |
|---|---|---|
| Role | Stores and manipulates data; performs the actual operations | Sequences the operations; decides what the datapath does and when |
| Components | Registers, ALU, multiplexers, buses, functional units | PC, IR, state register, decoder, control logic (FSM or microprogram) |
| Input | Data and control signals | Opcode / status flags from the datapath, clock, reset |
| Output | Results and status flags | Control signals (register loads, ALU function, mux selects, R/W) |
| Nature | Mostly combinational logic plus registers | Sequential logic (finite state machine) |
| Example | ALU adds R1 and R2 | Generates the signals "select ADD; load R1" |
✓ Answer checked by Claude Opus 5.5 (high effort)
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