ITPEC FE Morning October 2020 Question 13
Source exam: ITPEC FE Morning October 2020Topic: Computer Systems & Hardware
ITPEC FE Morning October 2020 — Question 13 of 80
ECC Redundant Bits — apply the given formula for error correction codes.
Given: a data bus of width 2^n bits requires n + 2 redundant bits.
- •
128 = 2^7→n = 7 - •Redundant bits =
7 + 2= 9
Why not others:
- (a) 3 — would apply to a 2-bit bus (2^1, n=1)
- (b) 8 — incorrectly uses n + 1 instead of n + 2
- (d) 10 — incorrectly uses n + 3
Key rule: Identify the exponent from the bus width (2^n), then apply the formula directly.
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