FreeCalypso > hg > freecalypso-schem2

annotate venus/src/periph/led_npn.v @ 96:ae6951a70d2b

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U403: change from 74LVC2G125 to 74LVC2G126 The two parts have the same footprint and pinout, but '126 3-state buffers have active-high OE inputs instead of active-low. The change is purely for software benefit: having GPIO 11/12 set to 1 correspond to that current contribution being enabled will be much more intuitive for developers and tinkerers.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 09 May 2022 19:27:11 +0000
parents 06e95ff0023b
children
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06e95ff0023b ON_nOFF indicator LED implemented
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1 /*
06e95ff0023b ON_nOFF indicator LED implemented
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2 * This module captures the circuit for showing the state of a digital signal
06e95ff0023b ON_nOFF indicator LED implemented
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3 * on a LED using an NPN transistor instead of a MOSFET, like we did for PWL
06e95ff0023b ON_nOFF indicator LED implemented
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4 * on Caramel2.
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5 */
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6
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7 module led_npn (GND, VBAT, Signal);
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8
06e95ff0023b ON_nOFF indicator LED implemented
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9 input GND, VBAT, Signal;
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06e95ff0023b ON_nOFF indicator LED implemented
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11 wire R_to_LED, LED_to_Q;
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12
06e95ff0023b ON_nOFF indicator LED implemented
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13 resistor R (VBAT, R_to_LED);
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14 basic_LED led (.A(R_to_LED), .C(LED_to_Q));
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15 transistor_slot Q (.E(GND), .B(Signal), .C(LED_to_Q));
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16
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17 endmodule