simulator/src/sequential/JKflipFlop.js
import CircuitElement from '../circuitElement';
import Node, { findNode } from '../node';
import simulationArea from '../simulationArea';
import { correctWidth, lineTo, moveTo, fillText } from '../canvasApi';
/**
* @class
* JKflipFlop
* JK flip flop has 6 input nodes:
* clock, J input, K input, preset, reset ,enable.
* @extends CircuitElement
* @param {number} x - x coord of element
* @param {number} y - y coord of element
* @param {Scope=} scope - the ciruit in which we want the Element
* @param {string=} dir - direcion in which element has to drawn
* @category sequential
*/
import { colors } from '../themer/themer';
export default class JKflipFlop extends CircuitElement {
constructor(x, y, scope = globalScope, dir = 'RIGHT') {
super(x, y, scope, dir, 1);
/*
this.scope['JKflipFlop'].push(this);
*/
this.directionFixed = true;
this.fixedBitWidth = true;
this.setDimensions(20, 20);
this.rectangleObject = true;
this.J = new Node(-20, -10, 0, this, 1, 'J');
this.K = new Node(-20, 0, 0, this, 1, 'K');
this.clockInp = new Node(-20, 10, 0, this, 1, 'Clock');
this.qOutput = new Node(20, -10, 1, this, 1, 'Q');
this.qInvOutput = new Node(20, 10, 1, this, 1, 'Q Inverse');
this.reset = new Node(10, 20, 0, this, 1, 'Asynchronous Reset');
this.preset = new Node(0, 20, 0, this, 1, 'Preset');
this.en = new Node(-10, 20, 0, this, 1, 'Enable');
this.state = 0;
this.slaveState = 0;
this.masterState = 0;
this.prevClockState = 0;
// this.wasClicked = false;
}
/**
* @memberof JKflipFlop
* if none of the predefined nodes have been deleted it isresolvable
*/
isResolvable() {
if (this.reset.value == 1) return true;
if (this.clockInp.value != undefined && this.J.value != undefined && this.K.value != undefined) return true;
return false;
}
newBitWidth(bitWidth) {
this.bitWidth = bitWidth;
this.dInp.bitWidth = bitWidth;
this.qOutput.bitWidth = bitWidth;
this.qInvOutput.bitWidth = bitWidth;
this.preset.bitWidth = bitWidth;
}
/**
* @memberof JKflipFlop
* Edge triggered master slave JK flip flop is resolved by
* setting the slaveState = masterState when there is an edge
* in the clock. masterState = this.J when no change in clock.
*/
resolve() {
if (this.reset.value == 1) {
this.masterState = this.slaveState = this.preset.value || 0;
} else if (this.en.value == 0) {
this.prevClockState = this.clockInp.value;
} else if (this.en.value == 1 || this.en.connections.length == 0) {
if (this.clockInp.value == this.prevClockState) {
if (this.clockInp.value == 0 && this.J.value != undefined && this.K.value != undefined) {
if (this.J.value && this.K.value) { this.masterState = 1 ^ this.slaveState; }
else if (this.J.value ^ this.K.value) { this.masterState = this.J.value; }
}
} else if (this.clockInp.value != undefined) {
if (this.clockInp.value == 1) {
this.slaveState = this.masterState;
} else if (this.clockInp.value == 0 && this.J.value != undefined && this.K.value != undefined) {
if (this.J.value && this.K.value) { this.masterState = 1 ^ this.slaveState; }
else if (this.J.value ^ this.K.value) { this.masterState = this.J.value; }
}
this.prevClockState = this.clockInp.value;
}
}
if (this.qOutput.value != this.slaveState) {
this.qOutput.value = this.slaveState;
this.qInvOutput.value = this.flipBits(this.slaveState);
simulationArea.simulationQueue.add(this.qOutput);
simulationArea.simulationQueue.add(this.qInvOutput);
}
}
customSave() {
var data = {
nodes: {
J: findNode(this.J),
K: findNode(this.K),
clockInp: findNode(this.clockInp),
qOutput: findNode(this.qOutput),
qInvOutput: findNode(this.qInvOutput),
reset: findNode(this.reset),
preset: findNode(this.preset),
en: findNode(this.en),
},
constructorParamaters: [this.direction],
};
return data;
}
customDraw() {
var ctx = simulationArea.context;
ctx.strokeStyle = (colors['stroke']);
ctx.fillStyle = (colors['fill']);
ctx.beginPath();
ctx.lineWidth = correctWidth(3);
var xx = this.x;
var yy = this.y;
// rect(ctx, xx - 20, yy - 20, 40, 40);
moveTo(ctx, -20, 5, xx, yy, this.direction);
lineTo(ctx, -15, 10, xx, yy, this.direction);
lineTo(ctx, -20, 15, xx, yy, this.direction);
// if ((this.b.hover&&!simulationArea.shiftDown)|| simulationArea.lastSelected == this || simulationArea.multipleObjectSelections.contains(this)) ctx.fillStyle = "rgba(255, 255, 32,0.8)";ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.font = '20px Raleway';
ctx.fillStyle = colors['input_text'];
ctx.textAlign = 'center';
fillText(ctx, this.slaveState.toString(16), xx, yy + 5);
ctx.fill();
}
}
JKflipFlop.prototype.tooltipText = 'JK FlipFlop ToolTip : gated SR flip-flop with the addition of a clock input.';
JKflipFlop.prototype.helplink = 'https://docs.circuitverse.org/#/chapter4/6sequentialelements?id=jk-flip-flop';
JKflipFlop.prototype.objectType = 'JKflipFlop';