Encoder and Decoder Trainer
NV6557
Operating Manual
Ver 1.1
141-B, Electronic Complex,
Pardeshipura, Indore- 452 010 India
Tel.: 91-731- 4211500
E-mail: info@nvistech.com
Toll free: 1800-103-5050
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Computer Organisation- Encoder and Decoder, Lecture notes of Computer Architecture and Organization
Computer Organisation- Encoder and Decoder
Typology: Lecture notes
2018/2019
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Encoder and Decoder Trainer NV
Operating Manual Ver 1.
141-B, Electronic Complex, Pardeshipura, Indore- 452 010 India Tel.: 91-731- 4211500 E-mail: info@nvistech.com Toll free: 1800-103-
Encoder and Decoder Trainer NV Table of contents
1. Introduction 3 2. Features 4 3. Technical Specifications 5 4. Theory 6 5. Experiments - Experiment 1 10 To study and verify the Truth Table of 8-to-3 Line Encoder. - Experiment 2 12
To study and verify the Truth Table of 3-to-8 Line Decoder.
6. Data Sheet 14 7. Warranty 16 8. List of Accessories 16
Features
**- +5 V SMPS Adaptor provided with the trainer for power supply
- Easy illustration of Encoder and Decoder
- LEDs for visual indication of inputs and outputs status
- SPDT switches for logic selection
- Good Quality, reliable sockets are provided at appropriate places on board** **for connections
- Strongly supported by systematic operating instructions
- e-Manual
- Two Year Warranty**
Technical Specifications
Input : +5 V DC
Logic levels : +5 V: HIGH (Logic 1)
0 V: LOW (Logic 0)
LED Indication : LED will ON (glow) for 1 state and will be OFF for 0 state
Dimensions (mm) : W 345 × D 240 × H 110
Weight : 750 g.
Table 1 The encoder in Fig.1 assumes that only one input line can be equal to1 at any time; otherwise the circuit has no meaning. Note that the circuit has eight inputs and could have 2^8 = 256 possible input combinations. Only eight of these combinations have any meaning. The other inputs combinations are don’t care conditions. Encoders of this type (Fig.1) are not available in IC packages, since they can be easily constructed with OR gates. The type of encoder available in IC form is called a priority encoder. These encoders establish an input priority to ensure that only the highest-priority input line is encoded. Thus, in Table-1, if priority is given to an input with a higher subscript number over one with a lower subscript number, then if both D 2 and D 5 are logic-1 simultaneously, the output will be 101 because D 5. Of course, the truth table of a priority encoder is different from the one in Table-1.
Decoder : A decoder is a digital function that produces a reverse operation from that of an encoder. It is a combinational circuit that converts binary information from n input lines to a maximum of 2n^ unique output lines. If the n-bit decoded information has unused or don’t-care combinations, the decoder output will have less than 2n^ outputs. The decoders presented here are called n-to-m line decoders where m ≤ 2 n. Their purpose is to generate the 2n^ (or less) minterms of n input variables. As an example, consider the 3-to-8-line decoder circuit ofFig.2. The three inputs are decoded into eight outputs, each output representing one of the minterms of the 3-input variables. The three inverters provide the complement of the inputs, and each one of the eight AND gates generate one of the minterms. A particular application of this decoder would be a binary-to-octal conversion. The input variables may represent a binary number, and the outputs will then represent the eight digits in the octal number system. However, a 3-to-8-line decoder can be used for decoding any 3-bit code to provide eight outputs, one for each element of the code.
Figure 2
Experiment 1 Objective : To study and verify the Truth Table of 8-to-3 Line Encoder. Procedure :
1. First make sure that toggle switches of input section are ‘Off’ (i.e. in downward direction). 2. Connect bits I 0 , I 1 , I 2 , I 3 , I 4 , I 5 , I 6 and I 7 of Input Section to the inputs D 0 , D 1 , D 2 , D 3 , D 4 , D 5 , D 6 and D 7 of 8-to-3 Line Encoder respectively. 3. Connect outputs of the Encoder X, Y and Z to O 1 , O 2 and O 3 of the Output Section. 4. Connect +5 V adaptor on the DC socket provided on the trainer. 5. Switch ‘On’ the power supply. 6. Now using toggle switches of Input Section provide input to the Encoder as per its truth table (Table No.1). Note :
- When the toggle switch is in the upward direction, LED will glow which represents the Logic 1 (i.e. +5V).
- When the toggle switch is in the downward direction, LED will not glow which represents the Logic 0 (i.e. 0V). 7. Observe the output, record it in observation table and verify the truth table.
Observation Table :
Observation Table :
Data Sheet
VCC = + 5V
Warranty 1) We guarantee the product against all manufacturing defects for 24 months from the date of sale by us or through our dealers. Consumables like dry cell etc. are not covered under warranty. 2) The guarantee will become void, if a) The product is not operated as per the instruction given in the operating manual. b) The agreed payment terms and other conditions of sale are not followed. c) The customer resells the instrument to another party. d) Any attempt is made to service and modify the instrument. 3) The non-working of the product is to be communicated to us immediately giving full details of the complaints and defects noticed specifically mentioning the type, serial number of the product and date of purchase etc. 4) The repair work will be carried out, provided the product is dispatched securely packed and insured. The transportation charges shall be borne by the customer.
List of Accessories
1) +5V Adaptor……………………………………………………………….…..1No.
2) Patch Cord…………………………………………………………….…..15 Nos.
3) e-Manual………..……………………………………………………………..1 No.
4) Accessories Bag……………….………………………………………………1 No.