FreeCalypso > hg > freecalypso-schem2

annotate venus/src/usb/FT2232D_block.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 8f3df7a222f5
children
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1 /*
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2 * This module encapsulates the FT2232D chip and its immediate accessories:
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3 * the oscillator crystal, the EEPROM, the AVCC filter and the cap on 3V3OUT.
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4 */
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5
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6 module FT2232D_block (GND, VCC, VCCIOA, VCCIOB,
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7 USBDP, USBDM, RESET, RSTOUT, PWREN,
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8 ADBUS, ACBUS, SI_WUA, BDBUS, BCBUS, SI_WUB);
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9
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10 input GND, VCC, VCCIOA, VCCIOB;
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11
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12 inout USBDP, USBDM;
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13
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14 input RESET;
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15 output RSTOUT, PWREN;
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16
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17 inout [7:0] ADBUS, BDBUS;
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18 inout [3:0] ACBUS, BCBUS;
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19 input SI_WUA, SI_WUB;
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20
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21 /* FT2232D pins handled within this block */
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22
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23 wire EECS, EESK, EEDATA;
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24 wire XTIN, XTOUT;
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25 wire AVCC, FTDI_3V3;
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26
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27 /* instantiate the FT2232D */
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28
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29 FT2232D_chip FT2232D (.GND(GND),
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30 .AGND(GND),
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31 .VCC(VCC),
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32 .AVCC(AVCC),
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33 .VCCIOA(VCCIOA),
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34 .VCCIOB(VCCIOB),
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35 .OUT_3V3(FTDI_3V3),
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36 .USBDP(USBDP),
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37 .USBDM(USBDM),
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38 .EECS(EECS),
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39 .EESK(EESK),
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40 .EEDATA(EEDATA),
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41 .RESET(RESET),
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42 .RSTOUT(RSTOUT),
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43 .TEST(GND),
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44 .PWREN(PWREN),
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45 .XTIN(XTIN),
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46 .XTOUT(XTOUT),
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47 .ADBUS(ADBUS),
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48 .ACBUS(ACBUS),
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49 .SI_WUA(SI_WUA),
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50 .BDBUS(BDBUS),
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51 .BCBUS(BCBUS),
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52 .SI_WUB(SI_WUB)
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53 );
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54
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55 /* VCCIO bypass caps */
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56
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57 capacitor VCCIOA_bypass_cap (VCCIOA, GND);
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58 capacitor VCCIOB_bypass_cap (VCCIOB, GND);
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59
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60 /* AVCC filter */
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61
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62 resistor AVCC_filter_R (VCC, AVCC);
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63 capacitor AVCC_cap (AVCC, GND);
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64
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65 /* 3V3OUT */
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66
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67 capacitor FTDI_3V3_cap (FTDI_3V3, GND);
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68
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69 /* crystal oscillator */
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70
67
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71 usb_xtal_wrap xtal (XTIN, XTOUT, GND);
23
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72 capacitor XTIN_cap (XTIN, GND);
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73 capacitor XTOUT_cap (XTOUT, GND);
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74
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75 /* serial EEPROM */
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76
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77 wire EEPROM_DOUT;
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78
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79 eeprom_93Cx6_16bit eeprom (.GND(GND),
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80 .VCC(VCC),
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81 .CS(EECS),
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82 .SK(EESK),
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83 .DIN(EEDATA),
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84 .DOUT(EEPROM_DOUT)
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85 );
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86
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87 resistor DOUT_series_R (EEPROM_DOUT, EEDATA);
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88 resistor DOUT_pullup_R (EEPROM_DOUT, VCC);
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89
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90 endmodule