What term describes the maximum number of bits per CPU instruction during one machine cycle?

What term describes the maximum number of bits per CPU instruction during one machine cycle?

• A. Word size
• B. Byte size
• C. Bit rate
• D. Register size

Answer: (A)

Word size is the width of the processor’s data path—the maximum number of bits it can handle in one operation during a single machine cycle. This width defines how much data the CPU can process at once and is tied to the size of the registers and the typical instruction length the architecture uses. For example, a 32-bit word size means the CPU operates on 32 bits at a time, with 32-bit registers and data paths. The other terms don’t fit as well: bit rate is about how many bits per second are moved, not the width of an instruction; byte size (8 bits) is a specific small width and doesn’t describe the processor’s overall data path; register size is related but isn’t universally the same as the processor’s maximum instruction width across all architectures. Therefore, word size best describes the maximum number of bits per CPU instruction during one machine cycle.

Word size is the width of the processor’s data path—the maximum number of bits it can handle in one operation during a single machine cycle. This width defines how much data the CPU can process at once and is tied to the size of the registers and the typical instruction length the architecture uses. For example, a 32-bit word size means the CPU operates on 32 bits at a time, with 32-bit registers and data paths. The other terms don’t fit as well: bit rate is about how many bits per second are moved, not the width of an instruction; byte size (8 bits) is a specific small width and doesn’t describe the processor’s overall data path; register size is related but isn’t universally the same as the processor’s maximum instruction width across all architectures. Therefore, word size best describes the maximum number of bits per CPU instruction during one machine cycle.