Placement Papers: Mindtree Paper 2004

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Mindtree came to DA-IICT, Gandhinagar and there were three different papers for three streams (CS, VLSI, DSP)

VLSI paper is attached. There were 16 questions (I have only 15) . Finally Mindtree took 55 students from DA-IICT.

  1. An expression was given like B + A. B + ! A. B + … And what will be the final expression o/p: (Easy)
  2. state diagram was given and what state will be detected?
  3. Counter and three states were given (13,15, 14,10) what will be the next value (ans. 11 Gray counter) ?
  4. For one circuit inputs are ABCD and output is zero for first eight inputs and 1 for next eight. What will be the expression for circuit (ans: A) ?
  5. What is octal representation of 01010101 (ans. 125) ?
  6. D flip-flop with inverted feedback was given and question was based on maximum frequency allowed (setup, hold etc. Times were given)
  7. Question based on instruction T states and CPI was asked.
  8. What happens when HALT instruction is executed? Enter wait state and waits for interrupt or reset, Enters in to sleep state, etc (ans. Waits for interrupt or reset) .
  9. What happens when PUSH instruction is executed: (content of accumulator is saved, content of PC is changed, stack pointer is decremented and value value is saved)
  10. Two bulbs of 40 Watt and 60 Watts were added in series. What will happen (40 watt will be brighter, 60 watts will be brighter, both will have same brightness, none) ? (Ans. 40 watt)
  11. If widths of all PMOS an NMOS are doubled in any circuit then what will be effect on noise margin (ans. No effect) ?
  12. If gate and one end of NMOS are connected to Vdd, what will be the output at second end of NMOS (Vdd-Vth NMOS are bad 1 s) ?
  13. a band limited signal is sampled at Nyquist rate, to reconstruct it the output will be given to: (RC filter, Envelope detector, LPF with--)
  14. What is expression for Noise figure?
  15. always @ (B or C)

if (B) D = C

Circuit will work as (Mux, Tri state buffer, Latch, None) (Ans. ________Tri state Buffer)