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: Ask which FPGA resource a synthesis tool maps ordinary gates and flip-flops onto. That resource is the Configurable Logic Block.

Step 2: A CLB pairs a look-up table, which can reproduce any truth table for combinational logic, with a register that holds a value across clock edges for sequential logic.

Step 3: The remaining options are specialised helpers: DSP slices accelerate arithmetic, the PLL manages clocks, and Block RAM provides on-chip memory. They support a design but do not form the core logic fabric.

Step 4: Therefore the general-purpose logic element is the CLB.

\[\boxed{\text{Configurable Logic Blocks}}\]