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annotate duart28c/src/vsrc/boot_ctrl.v @ 84:dbd57e8dd82a default tip

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sim-fpc-pasv/pcb: add Makefile for Gerber output
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 02 Nov 2022 07:22:44 +0000
parents 5bdd24aae51e
children
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1 /*
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2 * This module encapsulates the boot control addition for DUART28C.
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3 */
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4
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5 module boot_ctrl (GND, P_3V3, ChanB_RTS, ChanB_DTR);
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6
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7 input GND, P_3V3;
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8 input ChanB_RTS, ChanB_DTR;
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9
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10 wire CTL1_out, CTL2_out;
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12 /* pull-up resistors on FT2232D outputs */
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14 resistor ChanB_RTS_pullup (ChanB_RTS, P_3V3);
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15 resistor ChanB_DTR_pullup (ChanB_DTR, P_3V3);
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16
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17 /* open drain buffers */
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19 od_buffer_ic_common od_buf_common (.Vcc(P_3V3),
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20 .GND(GND)
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21 );
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23 capacitor od_buf_bypass_cap (P_3V3, GND);
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25 od_buffer_ic_slot buf_CTL1 (.A(ChanB_RTS), .Y(CTL1_out));
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26 od_buffer_ic_slot buf_CTL2 (.A(ChanB_DTR), .Y(CTL2_out));
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28 /* header connector */
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30 header_3pin ctl_if (.pin_1(GND),
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31 .pin_2(CTL1_out),
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32 .pin_3(CTL2_out)
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33 );
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35 endmodule