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annotate lunalcd1/src/schem.v @ 72:c2a3670c7aca

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lunalcd3.pcb: manually add bottom strap to LCD footprint
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 18 Nov 2021 06:11:27 +0000
parents 28a0574af823
children
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5
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1 module board ();
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2
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3 wire GND, VBAT, Vio;
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4 wire [15:0] DB;
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5 wire RD, WR, RS, CS, RESET;
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6 wire BL_EN, Vbacklight;
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7 wire [1:3] LEDK;
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8
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9 /* LCD module connector */
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10
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11 conn_36pin_plus2 fpc ( .pin_1(DB[15]),
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12 .pin_2(DB[14]),
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13 .pin_3(DB[13]),
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14 .pin_4(DB[12]),
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15 .pin_5(DB[11]),
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16 .pin_6(DB[10]),
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17 .pin_7(DB[9]),
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18 .pin_8(DB[8]),
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19 .pin_9(GND),
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20 .pin_10(DB[7]),
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21 .pin_11(DB[6]),
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22 .pin_12(DB[5]),
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23 .pin_13(DB[4]),
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24 .pin_14(DB[3]),
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25 .pin_15(DB[2]),
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26 .pin_16(DB[1]),
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27 .pin_17(DB[0]),
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28 .pin_18(Vio), /* IOVCC */
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29 .pin_19(Vio), /* VCI */
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30 .pin_20(RD),
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31 .pin_21(WR),
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32 .pin_22(RS),
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33 .pin_23(CS),
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34 .pin_24(RESET),
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35 .pin_25(GND), /* IM0 tied low */
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36 .pin_26(GND),
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37 .pin_27(Vbacklight), /* LEDA */
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38 .pin_28(LEDK[1]),
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39 .pin_29(LEDK[2]),
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40 .pin_30(LEDK[3]),
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41 /* the remaining pins are NC */
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42 .pin_31(),
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43 .pin_32(),
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44 .pin_33(),
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45 .pin_34(),
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46 .pin_35(),
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47 .pin_36(),
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48 /* ground the two mounting pads */
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49 .pin_37(GND),
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50 .pin_38(GND)
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51 );
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52
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53 /* bypass cap for LCD module core */
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54 capacitor LCD_bypass_cap (Vio, GND);
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55
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56 /* main interface connector */
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57
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58 header_26pin main_if ( .pin_1(DB[15]),
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59 .pin_2(DB[14]),
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60 .pin_3(DB[13]),
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61 .pin_4(DB[12]),
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62 .pin_5(DB[11]),
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63 .pin_6(DB[10]),
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64 .pin_7(DB[9]),
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65 .pin_8(DB[8]),
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66 .pin_9(DB[7]),
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67 .pin_10(DB[6]),
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68 .pin_11(DB[5]),
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69 .pin_12(DB[4]),
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70 .pin_13(DB[3]),
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71 .pin_14(DB[2]),
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72 .pin_15(DB[1]),
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73 .pin_16(DB[0]),
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74 .pin_17(CS),
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75 .pin_18(RD),
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76 .pin_19(WR),
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77 .pin_20(RS),
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78 .pin_21(GND),
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79 .pin_22(GND),
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80 .pin_23(RESET),
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81 .pin_24(Vio),
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82 .pin_25(BL_EN),
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83 .pin_26(GND)
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84 );
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85
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86 /* backlight circuit */
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87
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88 header_2pin VBAT_conn ( .pin_1(VBAT),
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89 .pin_2(GND)
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90 );
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91
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92 capacitor VBAT_bypass_cap (VBAT, GND);
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93
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94 regulator reg ( .IN(VBAT),
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95 .OUT(Vbacklight),
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96 .GND(GND),
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97 .EN(BL_EN)
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98 );
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99
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100 capacitor reg_out_cap (Vbacklight, GND);
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101
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102 resistor R1 (LEDK[1], GND);
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103 resistor R2 (LEDK[2], GND);
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104 resistor R3 (LEDK[3], GND);
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105
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28a0574af823 lunalcd1: added pull-down resistor on BL_EN line
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106 resistor R4 (BL_EN, GND);
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107
5
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108 endmodule