65 lines
2.1 KiB
TypeScript
65 lines
2.1 KiB
TypeScript
// R-S-Flip-Flop component for the LogicSimulator
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// Copyright (C) 2022 Sascha Nitsch
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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class RSFlipFlop extends BaseComponent {
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private a = true;
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private b = true;
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private r = true;
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private s = true;
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private clk = true;
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private oldclk = true;
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private q = false;
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constructor(simulator: Simulator, id: string, param: BaseComponentParam) {
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super(simulator, id, param);
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this.pins.set('r', new TriState(this, -30, -15));
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this.pins.set('s', new TriState(this, -30, 15));
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this.pins.set('clk', new TriState(this, -30, 0));
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this.pins.set('q', new TriState(this, 30, -15));
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this.getPin('q').setState(WireState.low);
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this.pins.set('notq', new TriState(this, 30, 15));
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this.getPin('notq').setState(WireState.high);
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}
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setup(canvas: SVGElement) {
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super.doSetup('rsflipflop', canvas);
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}
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io() {
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this.r = this.binary(this.getPin('r').getAndReset(), true);
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this.s = this.binary(this.getPin('s').getAndReset(), true);
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this.clk = this.binary(this.getPin('clk').getAndReset(), true);
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}
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update() {
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const oldstate = this.q;
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const rising = this.oldclk === false && this.clk === true;
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if (rising) {
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if (this.s === true) {
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this.q = true;
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}
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if (this.r === true) {
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this.q = false;
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}
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}
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const newstate = this.q;
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this.getPin('q').setBool(newstate);
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this.getPin('notq').setBool(newstate === false);
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this.oldclk = this.clk;
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return oldstate !== newstate;
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}
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}
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