Question

Which of the following components in an FPGA is responsible for implementing combinational and sequential logic?

• A. Digital Signal Processors
• B. Phase-Locked Loop
• C. Configurable Logic Blocks
• D. Block RAM

Hint:

The block with LUTs and flip-flops that realises user logic is the CLB.

Answer 1

The Correct Option is C

Step 1: An FPGA is built from a grid of programmable blocks connected by routing. The block that actually realises user logic is the Configurable Logic Block (CLB).

Step 2: Each CLB contains look-up tables (LUTs) that implement any combinational function, plus flip-flops that store state for sequential logic. Together they cover both combinational and sequential designs.

Step 3: Look at the other parts. DSP blocks are dedicated to fast multiply and add operations, a Phase-Locked Loop handles clock generation and timing, and Block RAM stores data. None of these is the general logic fabric.

Step 4: So the component responsible for implementing combinational and sequential logic is the Configurable Logic Block, option (C).