In FPGA architecture terminology, what is the fundamental logic tile that groups several smaller logic modules together and provides a local, programmable interconnect to connect those internal modules?

Introduction / Context:
An FPGA is built from repeating tiles of logic plus routing. Vendors give these tiles names, but the common textbook term is a configurable logic block (CLB). This question checks whether you can identify the FPGA building block that clusters smaller logic elements (e.g., LUTs, flip-flops) and includes local programmable interconnect to wire them together efficiently.

Given Data / Assumptions:

• The device in question is an FPGA (field-programmable gate array).
• The unit contains multiple smaller logic modules (often LUTs and registers).
• The unit has a local programmable interconnect fabric for intra-tile connectivity.

Concept / Approach:
Classically, an FPGA organizes logic into CLBs (or similar, such as logic array blocks or configurable logic elements, depending on the vendor). Each CLB contains several LUTs, optional carry chains, flip-flops, and local switch matrices. The local interconnect allows high-speed, short-hop connections without consuming global routing. This is distinct from boundary-scan (JTAG test), bed-of-nails (PCB test fixture), or CPLD (a different class of programmable logic).

Step-by-Step Solution:
Identify “multiple smaller logic modules” → LUTs/FFs within a tile.Identify “local programmable interconnect” → switch matrix inside the tile.Map to standard term → CLB (Configurable Logic Block).Rule out test and non-FPGA terms (bed-of-nails, boundary scan, CPLD).

Verification / Alternative check:
Vendor architecture overviews consistently depict CLB/LAB tiles that cluster LUTs and flip-flops and expose local routing resources.

Why Other Options Are Wrong:
Bed-of-nails is a PCB test method, not a logic block. Boundary scan is a board-level test access standard. A CPLD is a separate device family, not a block inside an FPGA.

Common Pitfalls:
Confusing vendor-specific names (e.g., slice, LAB) with the generic role of the tile; mixing up board-test terms with internal chip architecture terms.

Final Answer:
CLB