FreeCalypso > hg > freecalypso-schem2

annotate venus/src/usb/usb_domain.v @ 77:c273bf8a93cb

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precharge current limiting resistor nailed down
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 05 Dec 2021 03:07:45 +0000
parents 3becdb3b6dce
children
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1 /*
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2 * This module encapsulates the USB domain of FC Venus.
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3 */
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4
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5 module usb_domain (GND, VBUS, Host_TxD, Host_RxD, Host_RTS, Host_CTS,
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6 Host_DTR, Host_DCD, Host_RI, Host_TxD2, Host_RxD2,
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7 RPWON, nTESTRESET);
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8
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9 input GND;
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10 output VBUS;
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11
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12 output Host_TxD, Host_RTS, Host_DTR, Host_TxD2;
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13 input Host_RxD, Host_CTS, Host_DCD, Host_RI, Host_RxD2;
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14 output RPWON, nTESTRESET;
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15
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16 /* USB domain wires */
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17
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18 wire P_5V, P_3V3;
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19
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20 wire [7:0] ADBUS, BDBUS;
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21 wire [3:0] ACBUS, BCBUS;
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22
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23 usb_core usb ( .GND(GND),
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24 .VBUS(VBUS),
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25 .P_5V(P_5V),
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26 .VCCIOA(P_3V3),
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27 .VCCIOB(P_3V3),
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28 .ADBUS(ADBUS),
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29 .ACBUS(ACBUS),
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30 .SI_WUA(P_3V3),
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31 .BDBUS(BDBUS),
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32 .BCBUS(BCBUS),
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33 .SI_WUB(P_3V3),
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34 .PWREN() /* no connect */
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35 );
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36
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37 regulator_with_caps reg_3V3 (.GND(GND), .IN(P_5V), .OUT(P_3V3));
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38
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39 /* load resistor per USB-and-mobile-domains article section 2.4.1 */
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40 resistor Rload (P_3V3, GND);
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41
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42 usb_domain_buf buf (.GND(GND),
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43 .P_3V3(P_3V3),
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44 .Int_TxD(ADBUS[0]),
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45 .Int_RxD(ADBUS[1]),
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46 .Int_RTS(ADBUS[2]),
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47 .Int_CTS(ADBUS[3]),
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48 .Int_DTR(ADBUS[4]),
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49 .Int_DCD(ADBUS[6]),
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50 .Int_RI(ADBUS[7]),
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51 .Int_TxD2(BDBUS[0]),
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52 .Int_RxD2(BDBUS[1]),
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53 .Host_TxD(Host_TxD),
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54 .Host_RxD(Host_RxD),
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55 .Host_RTS(Host_RTS),
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56 .Host_CTS(Host_CTS),
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57 .Host_DTR(Host_DTR),
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58 .Host_DCD(Host_DCD),
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59 .Host_RI(Host_RI),
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60 .Host_TxD2(Host_TxD2),
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61 .Host_RxD2(Host_RxD2)
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62 );
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63
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64 usb_domain_bctl bctl ( .GND(GND),
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65 .P_3V3(P_3V3),
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66 .ChanB_RTS(BDBUS[2]),
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67 .ChanB_DTR(BDBUS[4]),
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68 .CTL1_out(RPWON),
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69 .CTL2_out(nTESTRESET)
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70 );
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71
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72 endmodule