• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Logic and Logic Gates

Extracts from this document...


BTEC NATIONAL CERTIFICATE - it practitioners [general] Centre 31200 Assignment number: 4 Logic and Logic Gates Students Name (a) UNIT title Computer Architecture (b) Unit Number 9 Date of Issue 5 May Date due 19 May 2009 Re-submission date Criteria Achieved Criteria Achieved Criteria Achieved Criteria Achieved P7 criteria achieved Criteria achieved criteria achieved criteria achieved M2 M4 criteria achieved Criteria achieved criteria achieved criteria achieved D1 Task 1 Task 2 Task 3 Task 4 P1 describe using examples how numeric and alphanumeric data can be coded within a computer system M1 explain using examples how data travels around the processor D1 create complex logic circuits made up of arrays of simple logic circuits P2 describe how analogue data can be converted and stored in computer systems M2 create logic circuits using simple logic gates and provide truth tables and explanation as to their operation D2 compare and contrast two different processors. P3 convert numeric data between different number systems including floating point M3 create low-level programs which involve decision making and branching P4 carry out manipulation of numeric data held in three different number systems M4 describe the difference between astable and bistable flip-flops. ...read more.


[D1] LOGIC GATES Truth Table Input Output LIST OF LOGIC GATES 1. AND 2. OR 3. NOT 4. NAND 5. NOR 6. XOR 7. XNOR WORKING OUT TRUTH TABLES All of the logic gates obviously have a truth table. The formula for working out the number of possible outputs is 2n. N is the number of inputs. E.g. if there are 2 inputs than the formula would be 22. The answer is 4. This means that there are 4 possible outputs. Truth Table Input Output AB Q 00 0 01 0 10 0 11 1 1. AND GATE In AND gates the output can only be 1 if all the inputs are all 1 and if either of the output are 0 and the other input is 1 than output will always be 0. The two inputs AB and output Q represent the expression which in effect is right because the stands for AND. Truth Table Input Output ABC Z 000 1 001 1 010 1 011 1 100 1 101 1 110 1 111 0 2. NAND GATE A NAND gate can have more than 2 inputs. ...read more.


If the input is 1 than output is 0 and if the output is 1 than output has to be 0. The logical expression is which means Q = NOT A. 6. XOR Truth Table Input Output AB Q 00 0 01 1 10 1 11 0 This type of gate is implemented in computers for binary addition. If both the inputs are 0 than the output will also be 0 and if both the inputs are 1 than the output will also be 0. XOR is actually short for exclusive OR. The logical expression for the XOR gate is which means that Q = (A AND NOT B) OR (B AND NOT A). Truth Table Input Output AB Q 00 1 01 0 10 0 11 1 7. XNOR This type of gate is simply the inverse of XOR (exclusive OR). You can only get a result of 1 is both the inputs are same either 00 or 11. If the inputs are different e.g. 0 and 1 or 1 and 0 than the output will be 0. The expression for this type of gate is. ?? ?? ?? ?? North Warwickshire & Hinckley College BTEC_NAT_U9_A3 1 Unit 09: Assignment 4 Anas Patel ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Computer Science section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Computer Science essays

  1. Peer reviewed

    information systems assignment 2

    4 star(s)

    is selected and will store the information a lot easier and can be easily viewed by any user. Ease of use Spreadsheets are very easy to user as it is a standard program which appears on all computers. No training is needed for the use of this program and a

  2. Control Unit, Memory Unit, and Arithmetic Logic Unit. The CPU or Central Processing ...

    to input the data, although, if the barcode is damaged so that the laser scanner cannot read it properly, the digits represented by the code are printed underneath so that they can be input by a user at a keyboard.

  1. Bill Gates Biography

    A personal computer called MITS Altair had just come out, but it had no OS (Operating System).

  2. With diagrams compare and contrast the relative advantages and disadvantages of digital transmission over ...

    This is a diagram shown below: UPT UPT stands for Unshielded twisted pair. This cable is the most common kind of copper telephone wiring. Twisted pair is the ordinary copper wire that connects home and many business computers to the telephone company.

  1. ICT Sample Work Welcome Centre Requirements

    Enterprises Ltd." The following fields must be shown on the Quotation: ADDRESS BLOCK: Title, First Name, Surname, Company Name, Address Line 1, Address Line 2, Town, County, Postcode EVENT DETAILS: Quotation No., Quotation Date, Event Name, Event Date, Start Time, End Time, No.

  2. Smart Card System

    The fonts, fonts size the thickness of the text and other will be take consider when designing the interface. All this will be need in order to produce a professional system. OUTPUT DESIGN Output design plays an important part in delivering information effectively to the user.

  1. Computer Architecture

    Condition Code Register (CCR) - this takes a snapshot of the state of the ALU after each instruction has been executed and records the state of the carry, negative, zero, and overflow flag-bits. In the above diagram the flag-bits are H, I, N, Z, V & C.

  2. ICT Sample Work India Red

    These fields are: o Generate a unique 5 digit quotation no. o Entry date (Present date). o Food Menu. o Automatic price and VAT displayed. o Total Cost. * Second data entry form which allows searching of previous quotation without having to re-enter data.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work