CN202871155U - Basic SR latch logical relationship demonstration apparatus - Google Patents
Basic SR latch logical relationship demonstration apparatus Download PDFInfo
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- CN202871155U CN202871155U CN 201220251247 CN201220251247U CN202871155U CN 202871155 U CN202871155 U CN 202871155U CN 201220251247 CN201220251247 CN 201220251247 CN 201220251247 U CN201220251247 U CN 201220251247U CN 202871155 U CN202871155 U CN 202871155U
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- light emitting
- emitting diode
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- electromagnetic switch
- single switch
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Abstract
The utility model discloses a basic SR latch logical relationship demonstration apparatus. The main body of the apparatus is a bistable memory circuit which comprises a first single switch S, a second single switch R, a first electromagnetic switch S-1, a second electromagnetic switch R-1, two pull-up resistors, a first light emitting diode, a second light emitting diode Q and a battery set. The apparatus simulates logic states ''1'' or ''0'' through the switches of the two light emitting diodes and explains logical relationships through a circuit diagram and physical apparatus, thereby realizing the effect of deepening the thinking and the understanding of beginners in a better manner.
Description
Technical field
The utility model relates to the digital circuit field, specifically, specially refers to a kind of basic SR latch logical relation apparatus for demonstrating.
Background technology
Be single principle explanation in the existing teaching about logical relation, lack circuit diagram and device in kind and annotate logical relation, can't effectively help the beginner better to think deeply and understand logical relation, teaching efficiency is had a greatly reduced quality.The logical relation apparatus for demonstrating that the utility model relates to can remedy above-mentioned weak point.
The utility model content
The purpose of this utility model is to provide a kind of basic SR latch logical relation apparatus for demonstrating, by adopting the design of the simple components and parts such as switch, electromagnetic switch and light emitting diode, demonstrate basic SR latch logical relation, overcome the deficiency in the conventional art, thereby realized the purpose of this utility model.
The technical matters that the utility model solves can realize by the following technical solutions:
A kind of basic SR latch logical relation apparatus for demonstrating, described basic SR latch logical relation apparatus for demonstrating circuit comprise first single switch S, second single switch R, the first electromagnetic switch S-1, the second electromagnetic switch R-1, two pull-up resistors, the first light emitting diode, the second light emitting diode Q and electric battery.The utility model comes analog logic state " 1 " or " 0 " by the switch of two light emitting diodes,
Described first single switch S, the first electromagnetic switch S-1 are in parallel with the first light emitting diode, described first single switch S, the first electromagnetic switch S-1 are connected with electric battery by a pull-up resistor afterwards with the first light emitting diode parallel connection,, the first electromagnetic switch S-1 is relevant with the current potential that B is ordered;
Described second single switch R, the second electromagnetic switch R-1 are in parallel with the second light emitting diode Q, described second single switch R, the second electromagnetic switch R-1 are connected with electric battery by a pull-up resistor afterwards with the second light emitting diode Q parallel connection, and the second electromagnetic switch is relevant with the current potential that A is ordered.
The logical relation characteristic of the utility model demonstration is as shown in the table.
As can be seen from the table, during S=R=1, the next state of trigger is unascertainable, and if this occurs, trigger is with out of hand.Corresponding to basic SR latch logical relation apparatus for demonstrating herein, namely be as first single switch S and second single switch R during simultaneously for " 1 ", no matter the first light emitting diode and the previous what state of the second light emitting diode represent current Q
N+1Extinguish simultaneously with point, represent that its positive and negative logic value all is fixed to " 0 ", therefore meaningless and abandoned it, so the use of set-reset flip-floop must be followed the constraint condition of SR=0, this is the Focal point and difficult point place of learn basic SR latch.Can derive the expression formula of expressing next state and existing attitude, input signal relation from property list, behind the constraint condition abbreviation, obtain characteristic equation for as follows with constitutional diagram:
Namely when first single switch S be " 0 " and second single switch R during for " 1 ", the Q before no matter
nAnd what state, the output logic value Q that it is current
N+1Be " 0 ", be " 1 "; When first single switch S is " 1 " and second single switch R during for " 0 ", the Q before no matter
nAnd what state, the output logic value Q that it is current
N+1Be " 1 ", be " 0 "; When S is " 0 " and R during for " 0 ", if second single switch R when being changed to " 0 " from " 1 ", then keeps Q
N+1Be " 0 ", be " 1 ".Because A point dead electricity at this moment, B point electric, electromagnet S-1 discharges, R-1 is adhesive, first single switch R is that " 0 " Shi Buhui affects Q from " 1 " for redirect
nBe " 0 ", be the state of " 1 "; In like manner if first single switch S from " 1 " when jumping to " 0 ", the state before then keeping is so that Q
I+1Be " 1 ", be " 0 "; If S occurring sometime for " 1 " and R during for " 1 ", by Q shown in Figure 1
I+1Be fixed value " 0 " with both, be considered to insignificant from logical concept, should abandon.
As Q or when being the logical value of " 1 ", electric battery can be lighted light emitting diode, and forming the logical function value is the result of " 1 ".
Can experience by above description, the beneficial effects of the utility model are: simple in structure, design ingeniously, and adopt circuit diagram or device in kind to annotate logical relation, can add better intensification beginner's thinking and understanding.If explore wherein profound principle, just can recognize, namely relevant with the state before the latch because relate to sequence problem, even be aided with circuit diagram and device in kind, also not a duck soup when explaining its characteristic equation and its logic behavior of description.If but after understanding, again explore its circuit diagram or device in kind, just have a kind of open-and-shut lucid and lively sensation.Also can further realize simultaneously, when not having circuit diagram or device in kind to assist, for the where the shoe pinches of understanding.Because just there is the difference of essence in linear logical thinking with the graphics thinking itself that walks abreast.
Description of drawings
Fig. 1 is the circuit diagram of basic SR latch logical relation apparatus for demonstrating described in the utility model.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the utility model.
As shown in Figure 1, a kind of basic SR latch logical relation apparatus for demonstrating described in the utility model, it is characterized in that described basic SR latch logical relation apparatus for demonstrating circuit comprises first single switch S, second single switch R, the first electromagnetic switch S-1, the second electromagnetic switch R-1, two pull-up resistors, the first light emitting diode, the second light emitting diode Q and electric battery;
Described first single switch S, the first electromagnetic switch S-1 are in parallel with the first light emitting diode, and described first single switch S, the first electromagnetic switch S-1 are connected with electric battery by a pull-up resistor afterwards with the first light emitting diode parallel connection;
Described second single switch R, the second electromagnetic switch R-1 are in parallel with the second light emitting diode Q, and described second single switch R, the second electromagnetic switch R-1 are connected with electric battery by a pull-up resistor afterwards with the second light emitting diode Q parallel connection.
As Q or when being logical one, corresponding light emitting diode is lighted as indication among the figure.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. basic SR latch logical relation apparatus for demonstrating, it is characterized in that described SR latch logical relation apparatus for demonstrating circuit comprises first single switch S, second single switch R, the first electromagnetic switch S-1, the second electromagnetic switch R-1, two pull-up resistors, the first light emitting diode, the second light emitting diode Q and electric battery;
Described first single switch S, the first electromagnetic switch S-1 are in parallel with the first light emitting diode, described first single switch S, the first electromagnetic switch S-1 are connected with electric battery by a pull-up resistor afterwards with the first light emitting diode parallel connection, and the first electromagnetic switch S-1 is relevant with the current potential that B is ordered;
Described second single switch R, the second electromagnetic switch R-1 are in parallel with the second light emitting diode Q, described second single switch R, the second electromagnetic switch R-1 are connected with electric battery by a pull-up resistor afterwards with the second light emitting diode Q parallel connection, and the second electromagnetic switch is relevant with the current potential that A is ordered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220251247 CN202871155U (en) | 2012-05-30 | 2012-05-30 | Basic SR latch logical relationship demonstration apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220251247 CN202871155U (en) | 2012-05-30 | 2012-05-30 | Basic SR latch logical relationship demonstration apparatus |
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| CN202871155U true CN202871155U (en) | 2013-04-10 |
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| CN 201220251247 Expired - Fee Related CN202871155U (en) | 2012-05-30 | 2012-05-30 | Basic SR latch logical relationship demonstration apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723929A (en) * | 2012-06-13 | 2012-10-10 | 上海第二工业大学 | SR (set and reset) trigger logical relationship demonstration device |
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2012
- 2012-05-30 CN CN 201220251247 patent/CN202871155U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723929A (en) * | 2012-06-13 | 2012-10-10 | 上海第二工业大学 | SR (set and reset) trigger logical relationship demonstration device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20140530 |