Clock Domain Crossing (CDC) Design & Verification Quiz

What is the main focus of the paper by Clifford E. Cummings?

• Microprocessor design

• Clock Domain Crossing (CDC) Design & Verification Techniques

• Networking protocols

• Analog circuit design

What is metastability in the context of digital design?

• Signals that are always stable

• Signals that change values frequently

• Signals that do not assume stable 0 or 1 states for some duration

• Signals that are immune to clock cycles

What is the purpose of a two flip-flop synchronizer in CDC design?

• To introduce delays in signal transmission

• To reduce the number of clock cycles

• To increase clock frequency

• To sample an asynchronous signal and output a synchronized version

What is the 'three edge' requirement in CDC design?

• Signals must change three times before sampling

• Signals must have three edges

• Signals must be stable for three destination clock edges

• Signals must have three different values

What is the advantage of the open-loop solution for passing signals across CDC boundaries?

• It ensures acknowledgment of received signals

• It is the fastest way to pass signals without acknowledgment

• It guarantees synchronization of all signals

• It eliminates the need for clock domains

What is the advantage of synchronizing a feedback signal in a closed loop solution?

• Acknowledges that the first control signal was recognized and sampled into the new clock domain

• Increases the chance of sampling failures

• Reduces the delay associated with synchronizing control signals

• Guarantees that the data will be loaded into the register

Why is it important to use a naming convention to identify the clock source of every signal in a design?

• To confuse team members

• To introduce errors in the design

• To make grouping of signals for timing analysis easier

• To slow down the design process

What is the purpose of using a 1-deep two register FIFO synchronizer in multi-bit CDC signal passing?

• To increase the number of clock cycles required for data transfer

• To complicate the design process

• To introduce more clock domains

• To reduce the number of clock cycles required for data transfer

Why is it recommended to only allow one clock per module in design partitioning?

• To complicate the synthesis scripts

• To make static timing analysis easier

• To slow down the design process

• To make static timing analysis more difficult

What is the main reason for partitioning the design blocks into one-clock modules?

• To confuse the design team members

• To introduce more clock domains

• To make the timing verification of synchronous sub-blocks easier

• To make the design process more complex