A control signal used to enable a specific chip in a memory system, allowing it to respond to address requests, is called:

• A. Chip Select (CS) Signal
• B. Read Signal
• C. Write Signal
• D. Clock Signal

Answer: (A)

The signal used to enable a specific memory chip so it responds to address requests is the Chip Select (CS) signal.

In a memory system with multiple chips, a decoder activates only one chip at a time by asserting its CS line. When CS is active, the chosen chip pays attention to the address and the operation (read or write) and places data on the bus or takes data from the bus as needed. The other chips see their CS lines inactive and keep their outputs in high impedance, so they don’t interfere on the shared data bus.

Read and write signals indicate the type of operation, and the clock provides timing, but neither by itself selects which chip should respond. CS is the control line that selects the intended chip.