84 lines
3.2 KiB
TypeScript
84 lines
3.2 KiB
TypeScript
// Logic simulation for the 74xx161 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 Logic74xx161 extends BaseComponent {
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private o = 0;
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private i = 0;
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private mr = false;
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private cet = false;
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private cep = false;
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private clk = false;
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private oldclk = false;
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private pe = 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('clk', new TriState(this, -45, 30));
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this.pins.set('i0', new TriState(this, -45, -30));
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this.pins.set('i1', new TriState(this, -45, -15));
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this.pins.set('i2', new TriState(this, -45, 0));
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this.pins.set('i3', new TriState(this, -45, 15));
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this.pins.set('o0', new TriState(this, 45, -30));
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this.pins.set('o1', new TriState(this, 45, -15));
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this.pins.set('o2', new TriState(this, 45, 0));
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this.pins.set('o3', new TriState(this, 45, 15));
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this.pins.set('cet', new TriState(this, -45, 60));
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this.pins.set('cep', new TriState(this, -45, 45));
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this.pins.set('mr', new TriState(this, -45, -60));
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this.pins.set('pe', new TriState(this, -45, -45));
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this.pins.set('tc', new TriState(this, 45, 60));
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}
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setup(canvas: SVGElement) {
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super.doSetup('logic74xx161', canvas);
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}
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io() {
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this.clk = this.binary(this.getPin('clk').getAndReset(), true);
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this.mr = this.binary(this.getPin('mr').getAndReset(), true);
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this.cet = this.binary(this.getPin('cet').getAndReset(), true);
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this.cep = this.binary(this.getPin('cep').getAndReset(), true);
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this.i =
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this.asint(this.binary(this.getPin('i0').getAndReset(), true), 1) +
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this.asint(this.binary(this.getPin('i1').getAndReset(), true), 2) +
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this.asint(this.binary(this.getPin('i2').getAndReset(), true), 4) +
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this.asint(this.binary(this.getPin('i3').getAndReset(), true), 8);
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this.pe = this.binary(this.getPin('pe').getAndReset(), true);
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}
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update(): boolean {
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let mod = false;
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if (this.mr === false) {
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mod = this.o !== 0;
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this.o = 0;
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}
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const rising = this.clk && this.oldclk === false;
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this.oldclk = this.clk;
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if (this.pe === false && rising) {
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// load
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this.o = this.i;
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} else if (rising && this.cet && this.cep) {
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this.o = (this.o + 1) % 16;
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}
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this.getPin('o0').setBool((this.o & 1) !== 0);
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this.getPin('o1').setBool((this.o & 2) !== 0);
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this.getPin('o2').setBool((this.o & 4) !== 0);
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this.getPin('o3').setBool((this.o & 8) !== 0);
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this.getPin('tc').setBool(this.o === 15);
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return mod;
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}
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}
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