FreeCalypso > hg > fc-small-hw

annotate mmtb1/schem+bom/vsrc/led_circuit.v @ 28:bd7eec55ebc0

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duart28: new design ideas * added input buffers (LVC with Ioff feature) to prevent high current flow from powered-up target into powered-down FT2232D inputs; * added series resistors on outputs to limit current flow from powered-up adapter into powered-down Calypso target; * buffer IC changed from 74LVC125A to 74LVC541A.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 28 Jun 2020 22:06:24 +0000
parents 0f9bdd60ce50
children
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1 /*
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2 * This module captures the circuit for showing the state of a digital signal
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3 * on a LED without loading that digital signal by driving the LED from VBAT
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4 * and using a MOSFET to control it.
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5 */
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7 module led_circuit (GND, VBAT, Signal);
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9 input GND, VBAT, Signal;
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11 wire R_to_LED, LED_to_Q;
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13 resistor R (VBAT, R_to_LED);
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14 diode led (.A(R_to_LED), .C(LED_to_Q));
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15 mosfet Q (.G(Signal), .S(GND), .D(LED_to_Q));
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17 endmodule