UGC-NET | UGC NET CS 2015 Jun – III | Question 2

Consider a 32 – bit microprocessor, with a 16 – bit external data bus, driven by an 8 MHz input clock. Assume that this microprocessor has a bus cycle whose minimum duration equals four input clock cycles. What is the maximum data transfer rate for this microprocessor?

(A)

8 x 10⁶ bytes/sec

(B)

4 x 10⁶ bytes/sec

(C)

16 x 10⁶ bytes/sec

(D)

4 x 10⁹ bytes/sec

Answer: (B)

Explanation:

In a 32 – bit microprocessor, with a 16 – bit external data bus, data transferred per bus cycle = 2B. 
Bus clock = 8 MHz. 
Minimum bus cycle duration = 4 clock cycles 
Maximum bus cycle rate = 8 MHz / 4 = 2 M/sec 
Data transfer rate = bus cycle rate * data per bus cycle = 2 M * 2 = 4 * 10⁶ B/sec. 

So, option (B) is correct.

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