57 lines
1.9 KiB
TypeScript
57 lines
1.9 KiB
TypeScript
// Logic simulation for the 74xx21 IC 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 Logic74xx21 extends BaseComponent {
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private a = false;
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private b = false;
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private c = false;
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private d = false;
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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('a', new TriState(this, -30, -15));
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this.pins.set('b', new TriState(this, -30, -5));
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this.pins.set('c', new TriState(this, -30, 5));
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this.pins.set('d', new TriState(this, -30, 15));
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this.pins.set('q', new TriState(this, 30, 0));
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}
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setup(canvas: SVGElement) {
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super.doSetup('logic74xx21', canvas);
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}
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io() {
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this.a = this.binary(this.getPin('a').getAndReset(), true);
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this.b = this.binary(this.getPin('b').getAndReset(), true);
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this.c = this.binary(this.getPin('c').getAndReset(), true);
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this.d = this.binary(this.getPin('d').getAndReset(), true);
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}
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update(): boolean {
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if (this.startdelay) {
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--this.startdelay;
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return false;
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}
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const oldstate = this.q;
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let mod = false;
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this.q = this.a && this && this.c && this.d;
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mod ||= this.q !== oldstate;
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this.getPin('q').setBool(this.q);
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return mod;
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}
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}
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