Answer / jaya suriya

IN SPARTAN 3E BOARD.. THE INTERNAL CLOCK FREQUENCY IS
16MHZ... IF WE WANT TO INTERFACING THE EXT DIPLAY DEVICES
WE WON'T RUN IT WITH A NORMAL CLOCK FREQ(16
MHZ)....THATSWHY I HAVE TO CREATED NEW CLOCK PULSE WITH THE
FREQ OF 1HZ BY DEVIDING THE CLOCK..... TAKE THE NORMAL CLK
AS A REFERENCE...THIS IS KNOWN AS CLOCK DIVIDER CONCEPT...

ENTITY CLK_DIV IS
PORT(CLK: IN STD_LOGIC;
NEWCLK:OUT STD_LOGIC);
END CLK_DIV
ARCH BEH OF CLK_DIV IS
VARIABLE COUNT:INTEGER:=0;
SIGNAL CLKN:STD_LOGIC;
BEGIN
PROCESS(CLK)
BEGIN
IF CLK='1' AND CLK'EVENT THEN
COUNT:=COUNT+1;
IF COUNT=8000000 THEN
NEWCLK<= NOT CLKN
COUNT:=0;
END PROCESS;
END BEH;

Answer / senthil

I am using the Mr.Suriya code with little modification.

ENTITY CLK_DIV IS
PORT(CLK: IN STD_LOGIC;
NEWCLK:OUT STD_LOGIC);
END CLK_DIV
ARCH BEH OF CLK_DIV IS
VARIABLE COUNT:INTEGER:=0;
BEGIN
PROCESS(CLK)
BEGIN
IF CLK='1' AND CLK'EVENT THEN
COUNT:=COUNT+1;
IF COUNT=8000000 THEN
NEWCLK<= '1';
COUNT:=0;
ELSE
NEWCLK<= '0';
END IF;
END IF;
END PROCESS;
END BEH;

Answer / manju

please initialize the variables before using it in the
behaviour architecture or else it will be in the unknown
state still it has some legal value.

Explain why present VLSI circuits use MOSFETs instead of BJTs?

1 Answers  

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Tell me the parameters as many as possible you know that used to character an amplifier?

1 Answers  

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Are you familiar with the term snooping?

1 Answers   Intel,

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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;

1 Answers  

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What is look up table in vlsi?

1 Answers  

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What are the Advantages and disadvantages of Mealy and Moore?

1 Answers   Intel,

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Explain the operation considering a two processor computer system with a cache for each processor.

0 Answers   Intel,

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Explain the operation considering a two processor computer system with a cache for each processor.

1 Answers   Intel,

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what are three regions of operation of MOSFET and how are they used?

1 Answers  

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Mention what are the two types of procedural blocks in Verilog?

1 Answers  

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What are the different types of skews used in vlsi?

1 Answers  

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

1 Answers   Intel,

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