CPLD design workflow: “Using a CPLD (Complex Programmable Logic Device) design environment, we can simulate arbitrary input combinations and observe the resulting outputs to verify correct operation.” This statement is ________.

Introduction / Context:
Modern digital design flows rely on simulation before hardware programming. CPLD and FPGA toolchains include functional and timing simulators that let engineers test logic with exhaustive or targeted input vectors. The question checks understanding that simulation is a standard, integral step of CPLD design verification.

Given Data / Assumptions:

• Design described in HDL or schematic.
• Design environment includes a simulator.
• Goal: verify logical correctness prior to device programming.

Concept / Approach:
Simulation lets you apply input stimuli and analyze expected outputs using waveforms, truth tables, and assertions. You can perform both functional simulations (logic only) and, with device models, timing simulations (including propagation delays). This process reduces hardware debug time and catches logic errors early.

Step-by-Step Solution:

Verification / Alternative check:
Most vendor tools (e.g., from Intel/Altera, Lattice, Microchip/Microsemi) include simulators or integrate with third-party tools. Simulation-based signoff is a standard milestone before hardware bring-up.

Why Other Options Are Wrong:

• Incorrect/Only for PALs/Only after programming: Simulation occurs in software without needing hardware programmed.
• Only without timing models: Timing simulation is also common when device-specific models are available.

Common Pitfalls:
Skipping simulation to “test on hardware,” leading to longer debug cycles; failing to include corner cases in the testbench; ignoring timing closure and constraints which can change behavior post-synthesis.

Final Answer:
Correct