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annotate venus/src/usb/usb_domain_buf.v @ 37:9c2f913fa5cf

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venus/doc/MEMIF-fixed-2.8V: explanatory article
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 24 Nov 2021 18:14:11 +0000
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children
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1 /*
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2 * This module encapsulates the 74LVC541A buffer in the USB domain.
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3 */
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4
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5 module usb_domain_buf (GND, P_3V3,
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6 Int_TxD, Int_RxD, Int_RTS, Int_CTS,
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7 Int_DTR, Int_DCD, Int_RI, Int_TxD2, Int_RxD2,
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8 Host_TxD, Host_RxD, Host_RTS, Host_CTS,
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9 Host_DTR, Host_DCD, Host_RI, Host_TxD2, Host_RxD2);
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10
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11 input GND, P_3V3;
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13 input Int_TxD, Int_RTS, Int_DTR, Int_TxD2;
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14 output Int_RxD, Int_CTS, Int_DCD, Int_RI, Int_RxD2;
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16 output Host_TxD, Host_RTS, Host_DTR, Host_TxD2;
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17 input Host_RxD, Host_CTS, Host_DCD, Host_RI, Host_RxD2;
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18
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19 /* buffer common part */
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20
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21 x541_common common (.Vcc(P_3V3),
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22 .GND(GND),
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23 .nOE1(GND),
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24 .nOE2(GND)
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25 );
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26
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27 capacitor bypass_cap (P_3V3, GND);
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29 /* input buffers */
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30
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31 buffer_slot_basic buf_RxD (.A(Host_RxD), .Y(Int_RxD));
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32 buffer_slot_basic buf_CTS (.A(Host_CTS), .Y(Int_CTS));
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33 buffer_slot_basic buf_DCD (.A(Host_DCD), .Y(Int_DCD));
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34 buffer_slot_basic buf_RI (.A(Host_RI), .Y(Int_RI));
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35 buffer_slot_basic buf_RxD2 (.A(Host_RxD2), .Y(Int_RxD2));
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36
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37 /* output buffers */
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38
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39 buffer_slot_basic buf_TxD (.A(Int_TxD), .Y(Host_TxD));
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40 buffer_slot_basic buf_DTR (.A(Int_DTR), .Y(Host_DTR));
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41 buffer_slot_basic buf_TxD2 (.A(Int_TxD2), .Y(Host_TxD2));
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42
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43 /* RTS direct pass-thru: use an 0402 0R jumper */
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44 resistor jmp_RTS (Int_RTS, Host_RTS);
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45
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46 endmodule