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Very Large Scale Integration (VLSI)
Very Large Scale Integration (VLSI) is a technology used to fabricate integrated circuits (IC). The various stages of design, simulation, synthesis, timing analysis, layout and fabrication can be discussed in this category. It is a wide spread technology as most of the existing technologies are digital technologies and need an IC to implement. It is VLSI which made computer to be of the size of a pocket from the size of two rooms.
703 Questions
Types and objects declared in a VHDL description can have additional information, called attributes, associated with them. There are a number of standard pre-defined attributes. An attribute is referenced using the ''' notation. Forexample,
thing'attr
refers to the attribute attr of the type or object thing.
What are the advantages and disadvantages of offset lithography printing?
Consistent high image quality.
Offset printing produces sharp and clean images and type more easily than letterpress printing because the rubber blanket conforms to the texture of the printing surface.
Quick and easy production of printing plates.
Longer printing plate life than on direct litho presses because there is no direct contact between the plate and the printing surface.
Properly developed plates running in conjunction with optimized inks and fountain solution may exceed run lengths of a million impressions.
Cost. Offset printing is the cheapest method to produce high quality printing in commercial printing quantities.
Disadvantages of offset printing compared to other printing methods include:
Slightly inferior image quality compared to rotogravure or photogravure printing.
Propensity for anodized aluminum printing plates to become sensitive (due to chemical oxidation) and print in non-image/background areas when developed plates are not cared for properly.
Time and cost associated with producing plates and printing press setup. This makes smaller quantity printing jobs impractical. As a result, smaller printing jobs are now moving to digital offset machines.
How combinational and sequential circuits implemented in VHDL?
which are used to describe the digital hardware of the system
'Total' has the highest score for the abbreviations that 'TTL' could mean (see link). Since you are probably dealing with accountants, it could also mean 'Time To Laugh'. ;)
What should be done with unused TTL output?
Unused TTL inputs should never be left open. Depending on how their logic levels
will affect the operation you want from the device, unused inputs should always
be tied to either the +5v supply (logic 1) or to the circuit ground (logic 0). If an
input is left open ("floating"), then it can assume either logic level, and you literally
never know which state it's in.
VHDL code for home security need to be written in structural modeling of VHDL. It will be a bunch of programs related to each and every home appliance we use and need to be combined. It is not a single program. It is a combination of several programs.
Litholography was invented by a homosexual british clown named fluffy.
How you will compare pass transistor with transmission gate logic?
The use of transmission gates eliminates the undesirable threshold voltage effects which give rise to loss of logic levels in pass transistor logic.
Write VHDL Code for a 16-bit shift left register?
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity shiftreg is
Port ( en : in STD_LOGIC;
clock : in STD_LOGIC;
reset :in std_logic;
data_i : in STD_LOGIC_VECTOR (15 downto 0);
shift : in STD_LOGIC;
data_o : out STD_LOGIC);
end shiftreg;
architecture Behavioral of shiftreg is
signal reg: std_logic_vector (15 downto 0);
begin
process (clock, en,reg,reset)
begin
if reset<='1' then
reg<=data_i;
elsif (clock'event and clock <='1' ) then
if (en <='1') then
reg <= data_i;
elsif (en<='1' and shift<='1') then
reg <= reg (14 downto 0) & '0';
end if;
end if;
end process;
data_o <= reg (15);
end Behavioral;
What are the various synthesis tools for vhdl?
Various synthesis tools are provided by vendors like XILINX, CADENCE, SYNOPSIS. Details are available at their websites.
Full form of vcc and vdd in TTL and CMOS?
vcc-voltage collector to collector
vdd- voltage deran to deran
ttl- transister transister logic
cmos - complementary metal oxide same conductor
What is tunneling effect in cmos?
If gate oxide is very thin then electrons in channel may enter into oxide region. This is called tunneling
A Test Bench in VHDL is code written in VHDL that provides stimulus for individual modules (also written in VHDL). Individual modules are instantiated by a single line of code showing the port connections to the module. The correctness of the written program can be checked by writing the test bench.
It is a collection of VHDL procedures and functions which allow the user to create their own scripting instructions for test stimulus. Designers manually design their test bench inputs to checks the output. The stimulus script or test case contains the instructions in a regular ASCII text file. The test bench VHDL package contains procedures to create instructions, read, parse and execute the test script.
Does solar cell technology use VLSI technology?
VLSI (very large scale integration) technology places tens of thousands of transistors (and their interconnections) on a very pure single-crystal chip of silicon.
A single solar cell is just ONE very largearea junction diode, operating in self produced reverse bias mode.
A common kind of solar cell starts with the same very pure single-crystal silicon, but the later processes are different from VLSI manufacturing processes.
Solar cells don't include any transistors,
So you could say that single-crystal solar cell uses one small part of VLSI technology, plus a bunch of its own unique processes.
Other kinds of solar cell use cast polycrystalline silicon or amorphous silicon or some other starting material.
As of 2007, the highest-efficiency solar cells use 3-junction gallium arsenide instead of silicon.
Their manufacturing processes are even less like VLSI manufacturing.
'Mask' simply is an arrangement of opaque & transparent areas, that is used to bear a 'pattern' in VLSI 'Patterning' process.
As we know, an IC is a combination of various 'layers' of silicon, each having a certain function in the big picture. Now in Patterning process, a bare silicon wafer is selectively exposed by patterning the insulating coating (silicon dioxide) on top. To pattern the SiO2, we use an 'organic photo-resist' layer, on top of SiO2. The 'mask' contain the design we want, where we want to expose Silicon. So, first we place the mask & pattern the resist (through UV/X-ray, Organic acid, etc etc) and then we pattern the SiO2 that has been exposed now. Resist will be completely removed later.
There are positive & negative Masks also, considering the opaque & transparent regions.
A virtual calculator can be implemented using VHDL. We call it VHDL calculator.
Handling precautions CMOS components?
IDK, i have to do this in tech, this is a difficult question.
To handle these components properly you need latex gloves, an extra large body suit.
and a trained professional. I happend to have all.
you need to carry the circut bored carefully, don<t even look at it, run with your eyes closed and your hands covering your ears. Some people will say different answers but this is the only correct way. Have three toes crossed on your right foot, and one on your left.
Scream the song Mary had a little lamb as your are running.
8 bit leading zero count vhdl program?
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity leadingzeros is
port (data : in std_logic_vector (7 downto 0);
zeros : out integer range 0 to 8);
end leadingzeros;
architecture Behavioral of leadingzeros is
begin
process (data)
variable temp : integer range 0 to 8;
begin
temp :=0;
for i in data'range loop
case data(i) is
when '0' => temp := temp +1;
when others => next;
end case;
zeros <= temp;
end loop;
end process;
end Behavioral;
What are the Best graduate universities in US for integrated circuit design and vlsi?
Check ISSCC and see where most of the publications come from. There aren't that many schools in the US offering competitive IC and VLSI ph.d programs.
Top 2:
UC Berkeley
MIT
And the rest:
These schools are arguably about the same. It all depends on the specific research you'd like to do.
- UCLA
- Stanford
- UCSD
- Caltech
- UIUC
- Michigan
- Oregon State University
- UC Irvine
- Cornell University
- UT Austin(for VLSI)
How can you write a VHDL code for full adder using two half adders?
Since a fulladder can be obtained by using 2 halfadders & 1 OR gate.....so we have to call an halfadder program as well as an OR program......this can be implemented easily with the help of structural model rather than dataflow and behavoioural model
