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Multimedia/Graphics ASIC Hardware Design Engineer Interview



Design a hardware to detect how many bits are 1 with only combination logic design

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2 Answers


Use adders connected in series adding in 1 for each bit in the word which is '1', and 0 for each bit which is '0'.

Steve on


lets assume the number is 8 bits . So use 8 2-to-1 muxes ( inputs as 0 and 1 ) and feed the connect the select switches to each bit of the number . So if the bit is high , 1 is propagated or else 0 is propagated .Check for the number of high mux outputs.

Vignesh on

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