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36 Cards in this Set
- Front
- Back
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What is a logic gate |
a circuit which makes logical decisions based on the combination of signals present on its inputs |
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What is hexadecimal |
Groups binary numbers into groups of 4. Allowing 16 bits |
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What is the base of the octal numbering system |
Base 8 |
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What is a linear cct |
A cct with just resistors Capacitors Inductors NO DIODES ETC |
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What is a logic cct |
implementing a Boolean function A logical operation performed on one or more binary inputs that produces a single binary output. |
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What are the logic gate symbols |
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In flip flops what is synchronous input |
data inputs to a flip flop (D, S and R, or J and K) are referred to as synchronous inputs because they have an effect on the outputs (Q and not-Q) only in step, or in sync, with the clock signal transitions. |
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What are the 4 basic flip flops |
Set-Reset (SR) flip-flop or Latch. JK flip-flop. D (Data or Delay) flip-flop. T (Toggle) flip-flop. |
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In flip flops what is maximum clocking frequency |
the time to transfer the input to output after the clock edge arrives. Net delay is the time required to transfer bits from one end of the net to another end. |
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In flip flops what is propagation delay |
amount of time it takes for the output of the first Flip-Flop to travel to the input of the second Flip-Flop |
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In flip flops what is set up time |
is the minimum amount of time a synchronous data input should be held steady before the clock event so that the data input is reliably sampled by the clock event. |
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In flip flops what is hold time |
(Sample time) the time a synchronous data input should be held steady after the clock event so that the data input is reliably sampled by the clock event. |
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In flip flops what is asynchronous input |
called asynchronous because they can set or reset the flip-flop regardless of the status of the clock signal. Typically, they’re called preset and clear: |
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What is a flip flop |
bistable devices, called “latches” because their outputs are locked onto their input until there is another change to its inputflip-flop is the most basic storage element in a sequential logic circuit |
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In flip flops what is clock pulse transition |
0 to 1 it is called a positive transition and when it moves from 1 to 0 it is called a negative transition. |
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In flip flops what is toggling |
Changes the output to the opposite. (Toggles it) logic-high input to a T flip-flop: if the output is currently logic high, it changes to logic low; if it’s currently logic low, it changes to logic high. |
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In flip flops what is the clocking symbol |
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In flip flops what is the symbol for a negative going transition |
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What is a D type flip flop |
is a modified Set-Reset flip-flop with the addition of an inverter to prevent the S and R inputs from being at the same logic level |
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What is a JK flip flop |
similar to the SR Flip-flop but there is no change in state when the J and K inputs are both LOW |
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What is a SR flip flop |
also known as a SR Latch, can be considered as one of the most basic sequential logic circuit possible. This simple flip-flop is basically a one-bit memory bistable device that has two inputs, one which will “SET” the device (meaning the output = “1”), and is labelled S and one which will “RESET” the device (meaning the output = “0”), labelled R. |
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What is a synchronous counter |
constructed of a number of flip-flops connected in cascade. synchronous counter provides a more reliable circuit for counting purposes, and for high-speed operation, as the clock pulses in this circuit are fed to every flip-flop in the chain at exactly the same time. |
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How do flip flops store data |
Flip-flop is use to store one bit of information. By connecting several Flip-flops together, they may store data that can represent the state of a sequencer, the value of a counter, an ASCII character in a computer’s memory or any other piece of information |
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What is a shift register |
shift register is a cascade of flip flops, sharing the same clock, in which the output of each flip-flop is connected to the "data" input of the next flip-flop in the chain |
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What is serial and parallel data transfer |
Serial data transmission sends data bits one after another over a single channel. Parallel data transmission sends multiple data bits at the same time over multiple channels. |
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What are the advantages of serial data transfer |
For long distance small amounts of data are transfered Data is in sync More reliable |
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What are the advantages of parallel data transfer |
Faster than serial Easier to program Disadvantages Can be sent out of sync |
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What are encoders and decoders |
convert data from one form to another form. Used in communication system such as telecommunication, networking, etc..to transfer data from one end to the other end. |
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How does a decimal to BCD encoder work |
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What is a priority encoder |
Takes the MSB and disregards anything else. Takes the highest binary digit |
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What is an 8 to 3 encoder |
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What is a hex to binary encoder |
15 to 4 |
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What is a plasma display |
display in which each pixel on the screen is illuminated by a tiny bit of plasma or charged gas, somewhat like a tiny neon light. |
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What is a LED display |
array of light-emitting diodes as pixels for a video display |
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What is a LCD display |
uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directly, instead using a backlight or reflector to produce images in color or monochrome. |
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What are drivers used for in decoders |
They use a transitor amplifier to drive each segment of the display. |
