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VLSI Interview Questions
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Need to convert this VHDL code into VLSI verilog code? LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL; ----using all functions of specific package--- ENTITY tollbooth2 IS PORT (Clock,car_s,RE : IN STD_LOGIC; coin_s : IN STD_LOGIC_VECTOR(1 DOWNTO 0); r_light,g_light,alarm : OUT STD_LOGIC); END tollbooth2; ARCHITECTURE Behav OF tollbooth2 IS TYPE state_type IS (NO_CAR,GOTZERO,GOTFIV,GOTTEN,GOTFIF,GOTTWEN,CAR_PAID,CHEATE D); ------GOTZERO = PAID $0.00--------- ------GOTFIV = PAID $0.05---------- ------GOTTEN = PAID $0.10---------- ------GOTFIF = PAID $0.15---------- ------GOTTWEN = PAID $0.20--------- SIGNAL present_state,next_state : state_type; BEGIN -----Next state is identified using present state,car & coin sensors------ PROCESS(present_state,car_s,coin_s) BEGIN CASE present_state IS WHEN NO_CAR => IF (car_s = '1') THEN next_state <= GOTZERO; ELSE next_state <= NO_CAR; END IF; WHEN GOTZERO => IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s = "00") THEN next_state <= GOTZERO; ELSIF (coin_s = "01") THEN next_state <= GOTFIV; ELSIF (coin_s ="10") THEN next_state <= GOTTEN; END IF; WHEN GOTFIV=> IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s = "00") THEN next_state <= GOTFIV; ELSIF (coin_s = "01") THEN next_state <= GOTTEN; ELSIF (coin_s <= "10") THEN next_state <= GOTFIV; END IF; WHEN GOTTEN => IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s ="00") THEN next_state <= GOTTEN; ELSIF (coin_s="01") THEN next_state <= GOTFIV; ELSIF (coin_s="10") THEN next_state <= GOTTWEN; END IF; WHEN GOTFIF => IF (car_s ='0') THEN next_state <= CHEATED; ELSIF (coin_s = "00") THEN next_state <= GOTFIF; ELSIF (coin_s ="01") THEN next_state <= GOTTWEN; ELSIF (coin_s = "10") THEN next_state <= GOTTWEN; END IF; WHEN GOTTWEN => next_state <= CAR_PAID; WHEN CAR_PAID => IF (car_s = '0') THEN next_state <= NO_CAR; ELSE next_state<= CAR_PAID; END IF; WHEN CHEATED => IF (car_s = '1') THEN next_state <= GOTZERO; ELSE next_state <= CHEATED; END IF; END CASE; END PROCESS;-----End of Process 1 -------PROCESS 2 for STATE REGISTER CLOCKING-------- PROCESS(Clock,RE) BEGIN IF RE = '1' THEN present_state <= GOTZERO; ----When the clock changes from low to high,the state of the system ----stored in next_state becomes the present state----- ELSIF Clock'EVENT AND Clock ='1' THEN present_state <= next_state; END IF; END PROCESS;-----End of Process 2------- --------------------------------------------------------- -----Conditional signal assignment statements---------- r_light <= '0' WHEN present_state = CAR_PAID ELSE '1'; g_light <= '1' WHEN present_state = CAR_PAID ELSE '0'; alarm <= '1' WHEN present_state = CHEATED ELSE '0'; END Behav;

5273

what is the difference between the testing and verification?

Intel,

1 6774

What is the mealy and moore machine's state diagram that can detect 3 consecutive heads of 3 coins ?

2 8076

Calculate rise delay of a 3-input NAND gate driving a 3-input NOR gate through a 6mm long and 0.45m wide metal wire with sheet resistance R = 0.065 / and Cpermicron= 0.25 fF/m. The resistance and capacitance of the unit NMOS are 6.5k and 2.5fF. Use a 3 segment -model for the wire. Consider PMOS and NMOS size of reference inverter as 2 and 1 respectively. Use appropriate sizing for the NAND and NOR gate.

3869

verify nmos passes good logic 0 and passes bad logic 1.also verify that pmos passes good logic 1 and passes bad logic 0.

Cosmic Circuits, HP,

2 32104

Help with VHDL programming. Write a VHDL code for a D-Latch with clear input ?? (Hint: Set up a “Process” with appropriate sensitivity list to get the desired D-Latch with Clr working.) Inputs AND OUTPUTS: entity Lab4b is Port ( Clr, Clk, D : in STD_LOGIC; Q : out STD_LOGIC); end Lab4b;

1608

Design an 8 is to 3 encoder using 4 is to encoder?

Intel,

1333

Explain Basic Stuff related to Perl?

Intel,

1045

Explain Cross section of a PMOS transistor?

Intel,

1234

What are the Advantages and disadvantages of Mealy and Moore?

Intel,

1274

Explain the working of Insights of an inverter ?

Intel,

1269

Explain Process technology? What package was used and how did you model the package/system? What parasitic effects were considered?

Intel,

1080

If the current through the poly is 20nA and the contact can take a max current of 10nA how would u overcome the problem?

Intel,

1124

Explain about 6-T XOR gate?

Intel,

1283

Explain Cross section of an NMOS transistor?

Intel,

1039


Post New VLSI Questions

Un-Answered Questions { VLSI }

What is the difference between nmos and pmos technologies?

1115


Process technology? What package was used and how did you model the package/system? What parasitic effects were considered?

3145


Explain how logical gates are controlled by Boolean logic?

1192


What transistor level design tools are you proficient with? What types of designs were they used on?

3448


what is Slack?

1193


Why do we gradually increase the size of inverters in buffer design? Why not give the output of a circuit to one large inverter?

1299


What are the steps involved in preventing the metastability?

1126


Draw the Layout of an Inverter?

2507


Explain why present VLSI circuits use MOSFETs instead of BJTs?

1156


Explain depletion region.

1036


Give various factors on which threshold voltage depends.

1306


Mention what are the different gates where Boolean logic are applicable?

1133


How can you model a SRAM at RTL Level?

5736


If an/ap = 0.5, an/ap = 1, an/ap = 3, for 3 inverters draw the transfer characteristics?

2503


Draw a CMOS Inverter. Explain its transfer characteristics

1186