====== System bus in mechanical order ======

On this page, the system bus is ordered by the pin numbers of the bus header.


===== IO1 pins =====

^  Pin^Block  ^Name    ^ Description                                    ^  ^
|  1| | GND     | System GND            ||
|  2| | GND     | System GND            ||
|  3| | nRESET  | Global reset pin. If low all modules connected to the bus will be reseted. The reset can be done by the USB controller, the FPGA on GECKO3main, by hand or by one of the additional modules connected to the bus.  To avoid destroying your reset circuit make sure only one pull-up resistor is mounted on only one board when stacking those together. Additionally make sure ICs as FPGAs and FX2 are only using three-state outputs connected together with the reset circuit. If you do not follow this approach you will risk destroying the reset circuit. ||
|  4| B3.0 | GPIO1_0    | ||
|  5| | GND     | System GND            ||
|  6| B3.1 | GPIO1_1   | ||
|  7| | EXTCLK0   | Clock line 0, for external or stack internal clock signal distribution. Around the clock lines ground pins are placed to get a pseudo coaxial behavior of the line.  ||
|  8| | GND     | System GND            ||
|  9| | GND     | System GND            ||
|  10| | EXTCLK1 | Clock line 1, for external or stack internal clock signal distribution. Around the clock lines ground pins are placed to get a pseudo coaxial behavior of the line.  ||
|  11| B3.2 | GPIO1_2  |  ||
|  12| | GND     | System GND            ||
|  13| B3.4 | GPIO1_4  | RXD1 of GECKO3xx, RXD of GECKO3gps ||
|  14| B3.3 | GPIO1_3  | TXD1 of GECKO3xx, TXD of GECKO3gps ||
|  15| B3.6 | GPIO1_6  | RTS1 of GECKO3xx, GPSRESET of GECKO3gps ||
|  16| B3.5 | GPIO1_5  | CTS1 of GECKO3xx  ||
|  17| B4.0 | GPIO1_8  | SCK1 of GECKO3xx  ||
|  18| B3.7 | GPIO1_7  |  ||
|  19| B4.2 | GPIO1_10 |  ||
|  20| B4.1 | GPIO1_9  |  ||
|  21| B4.4 | GPIO1_12 |  ||
|  22| B4.3 | GPIO1_11 |  ||
|  23| B4.6 | GPIO1_14 |  ||
|  24| B4.5 | GPIO1_13 |  ||
|  25| B5.0 | GPIO1_16 |  ||
|  26| B4.7 | GPIO1_15 |  ||
|  27| B5.2 | GPIO1_18 |  ||
|  28| B5.1 | GPIO1_17 |  ||
|  29| | GND     | System GND            ||
|  30| | GND     | System GND            ||
| //The Pins 31 to 90 are also available on the 60 pin connector on the GECKO3power module. Most of these signals have predefined functions// |||||
|  31| | VBUS    | USB supply voltage, provided if one of the modules is connected to an USB port. Can for example be used to charge batteries. According to the USB specification the voltage is in the range of 4.3 to 5.5 V. To avoid that a high equalising current flows between two modules (where each is connected to a USB port) connect a diode between the USB port and the VBUS signal.       ||
|  32| | VBUS    | USB supply voltage                        ||
|  33| | GND     | System GND            ||
|  34| | GND     | System GND            ||
|  35| | VBAT    | System battery voltage. In the voltage range of one LiPo Cell (3.7 - 4.5 V). If the board is powered from a different voltage source (such as a LiPo battery with multiple cells in series) the VBAT line must be powered by a voltage regulator with at least 3.3 V. One simple solution is to shorten VBAT with the +3V3 line.       ||
|  36| | VBAT    | System battery voltage, 3.3 - 4.5 V           ||
|  37| | VBAT    | System battery voltage, 3.3 - 4.5 V           ||
|  38| | VBAT    | System battery voltage, 3.3 - 4.5 V           ||
|  39| | VBAT    | System battery voltage, 3.3 - 4.5 V           ||
|  40| | VBAT    | System battery voltage, 3.3 - 4.5 V           ||
|  41| | GND     | System GND            ||
|  42| | GND     | System GND            ||
|  43| | GND     | System GND            ||
|  44| | GND     | System GND            ||
|  45| | GND     | System GND            ||
|  46| | GND     | System GND            ||
|  47| | +3V3    | System 3.3 V supply   ||
|  48| | +3V3    | System 3.3 V supply   ||
|  49| | +3V3    | System 3.3 V supply   ||
|  50| | +3V3    | System 3.3 V supply   ||
|  51| | +3V3    | System 3.3 V supply   ||
|  52| | +3V3    | System 3.3 V supply   ||
|  53| | GND     | System GND            ||
|  54| | GND     | System GND            ||
|  55| | GND     | System GND            ||
|  56| | GND     | System GND            ||
|  57| | LOW_BATTERY | Low battery indicating line. This line is pulled high from the power supply module if the battery will get empty   ||
|  58| | POWER_GOOD  | POK line. This signal is normal high and is pulled low if the power supply is overloaded or faulty         ||
|  59| | GND     | System GND            ||
|  60| | GND     | System GND            ||
|  61| B1.0 | M1_INA  | PWM Signal A, motor 1  ||
|  62| B2.0 | M1_ENA  | Encoder signal A, feedback signal from motor 1 ||
|  63| B1.1 | M1_INB  | PWM Signal B, motor 1  ||
|  64| B2.1 | M1_ENB  | Encoder signal B, feedback signal from motor 1 ||
|  65| B1.2 | M2_INA  | PWM Signal A, motor 2  ||
|  66| B2.2 | M2_ENA  | Encoder signal A, feedback signal from motor 2 ||
|  67| B1.3 | M2_INB  | PWM Signal B, motor 2  ||
|  68| B2.3 | M2_ENB  | Encoder signal B, feedback signal from motor 2 ||
|  69| B1.4 | M3_INA  | PWM Signal A, motor 3, not used on GECKO3 robot  ||
|  70| B2.4 | M3_ENA  | Encoder signal A, feedback signal from motor 3, not used on GECKO3 robot ||
|  71| B1.5 | M3_INB  | PWM Signal B, motor 3, not used on GECKO3 robot  ||
|  72| B2.5 | M3_ENB  | Encoder signal B, feedback signal from motor 3, not used on GECKO3 robot ||
|  73| B1.6 | M4_INA  | PWM Signal A, motor 4, not used on GECKO3 robot  ||
|  74| B2.6 | M4_ENA  | Encoder signal A, feedback signal from motor 4, not used on GECKO3 robot ||
|  75| B1.7 | M4_INB  | PWM Signal B, motor 4, not used on GECKO3 robot  ||
|  76| B2.7 | M4_ENB  | Encoder signal B, feedback signal from motor 4, not used on GECKO3 robot ||
|  77| B9.4 | LineSensorIn1   | Input signal to the line sensor 1 / CS2 of GECKO3xx as SPI-Master    ||
|  78| B9.5 | LineSensorOut1  | Output signal from the line sensor 1, connect to a delta sigma converter / CS3 of GECKO3xx as SPI-Master    ||
|  79| B9.6 | LineSensorIn2   | Input signal to the line sensor 2 / CS4 of GECKO3xx as SPI-Master     ||
|  80| B9.7 | LineSensorOut2  | Output signal from the Line sensor 2, connect to a delta sigma converter / CS5 of GECKO3xx as SPI-Master  ||   
|  81| | SDA     | I<sup>2</sup>C Bus data line, normaly all I<sup>2</sup>C components on the GECKO3 modules are connected to one bus. Place 2.2 kOhm Pull-Up resistors on controller boards ||
|  82| | LineSensorClk   | Clock output signal to trigger the D flip-flop of the line sensors ||
|  83| | SCL     | I<sup>2</sup>C Bus clock line ||
|  84| B5.3 | GPIO1_19   |    ||
|  85| B5.4 | GPIO1_20   |    ||
|  86| B5.5 | GPIO1_21   |    ||
|  87| B5.6 | GPIO1_22   |    ||
|  88| B5.7 | GPIO1_23   |    ||
|  89| | GND     | System GND            ||
|  90| | GND     | System GND            ||
| //End of the 60 pin connector on the GECKO3power module// |||||
|  91| B6.0 | GPIO1_24   |    ||
|  92| B6.1 | GPIO1_25   |    ||
|  93| B6.2 | GPIO1_26   |    ||
|  94| B6.3 | GPIO1_27   |    ||
|  95| B6.4 | GPIO1_28   |    ||
|  96| B6.5 | GPIO1_29   |    ||
|  97| B6.6 | GPIO1_30   |    ||
|  98| B6.7 | GPIO1_31   |    ||
|  99| B7.0 | GPIO1_32   |    ||
|  100| B7.1 | GPIO1_33   |    ||
|  101| B7.2 | GPIO1_34   |    ||
|  102| B7.3 | GPIO1_35   |    ||
|  103| B7.4 | GPIO1_36   |    ||
|  104| B7.5 | GPIO1_37   |    ||
|  105| B7.6 | GPIO1_38   |    ||
|  106| B7.7 | GPIO1_39   |    ||
|  107| B8.0 | GPIO1_40   | TxD0 (transmitted data) of GECKO3xx as RS-232  ||
|  108| B8.1 | GPIO1_41   | RxD0 (received data) of GECKO3xx as RS-232    ||
|  109| B8.2 | GPIO1_42   | DTR0 (data terminal ready) of GECKO3xx as RS-232  ||
|  110| B8.3 | GPIO1_43   | DSR0 (data set ready) of GECKO3xx as RS-232  ||
|  111| B8.4 | GPIO1_44   | RTS0 (request to send) of GECKO3xx as RS-232  ||
|  112| B8.5 | GPIO1_45   | CTS0 (clear to send) of GECKO3xx as RS-232  ||
|  113| B8.6 | GPIO1_46   | DCD0 (carrier detect) of GECKO3xx as RS-232  ||
|  114| B8.7 | GPIO1_47   | RI0 (ring indicator) of GECKO3xx as RS-232  ||
|  115| B9.0 | GPIO1_48   | SCK (serial clock) of GECKO3xx as SPI-Master  | |
|  116| B9.0 | GPIO1_49   | MOSI (master out slave in) of GECKO3xx as SPI-Master   ||
|  117| B9.0 | GPIO1_50   | MISO (master in slave out) of GECKO3xx as SPI-Master   ||
|  118| B9.0 | GPIO1_51   | CS1 of GECKO3xx as SPI-Master    ||
|  119| | GND     | System GND            ||
|  120| | GND     | System GND            ||

===== IO2 pins =====

^ Pin ^ Block ^ Signal Name ^ Description ^
| 1   | | GND  | System GND|
| 2   | | GND  | System GND|
| 3   | B10.0 | GPIO2_0   | |
| 4   | B10.1 | GPIO2_1   | |
| 5   | B10.2 | GPIO2_2   | |
| 6   | B10.3 | GPIO2_3   | |
| 7   | B10.4 | GPIO2_4   | |
| 8   | B10.5 | GPIO2_5   | |
| 9   | B10.6 | GPIO2_6   | |
| 10  | B10.7 | GPIO2_7   | |
| 11  | B11.0 | GPIO2_8   | |
| 12  | B11.1 | GPIO2_9   | |
| 13  | B11.2 | GPIO2_10  | |
| 14  | B11.3 | GPIO2_11  | |
| 15  | B11.4 | GPIO2_12  | |
| 16  | B11.5 | GPIO2_13  | |
| 17  | B11.6 | GPIO2_14  | |
| 18  | B11.7 | GPIO2_15  | |
| 19  | B12.0 | GPIO2_16  | |
| 20  | B12.1 | GPIO2_17  | |
| 21  | B12.2 | GPIO2_18  | |
| 22  | B12.3 | GPIO2_19  | |
| 23  | B12.4 | GPIO2_20  | |
| 24  | B12.5 | GPIO2_21  | |
| 25  | B12.6 | GPIO2_22  | |
| 26  | B12.7 | GPIO2_23  | |
| 27  | B13.0 | GPIO2_24  | |
| 28  | B13.1 | GPIO2_25  | |
| 29  | B13.2 | GPIO2_26  | |
| 30  | B13.3 | GPIO2_27  | |
| 31  | B13.4 | GPIO2_28  | |
| 32  | B13.5 | GPIO2_29  | |
| 33  | B13.6 | GPIO2_30  | |
| 34  | B13.7 | GPIO2_31  | |
| 35  | B14.0 | GPIO2_32  | |
| 36  | B14.1 | GPIO2_33  | |
| 37  | B14.2 | GPIO2_34  | |
| 38  | B14.3 | GPIO2_35  | |
| 39  | B14.4 | GPIO2_36  | |
| 40  | B14.5 | GPIO2_37  | |
| 41  | B14.6 | GPIO2_38  | |
| 42  | B14.7 | GPIO2_39  | |
| 43  | B15.0 | GPIO2_40  | |
| 44  | B15.1 | GPIO2_41  | |
| 45  | B15.2 | GPIO2_42  | |
| 46  | B15.3 | GPIO2_43  | |
| 47  | B15.4 | GPIO2_44  | |
| 48  | B15.5 | GPIO2_45  | |
| 49  | B15.6 | GPIO2_46  | |
| 50  | B15.7 | GPIO2_47  | |
| 51  | B16.0 | GPIO2_48  | |
| 52  | B16.1 | GPIO2_49  | |
| 53  | B16.2 | GPIO2_50  | |
| 54  | B16.3 | GPIO2_51  | |
| 55  | B16.4 | GPIO2_52  | |
| 56  | B16.5 | GPIO2_53  | |
| 57  | B16.6 | GPIO2_54  | |
| 58  | B16.7 | GPIO2_55  | |
| 59  | B17.0 | GPIO2_56  | |
| 60  | B17.1 | GPIO2_57  | |
| 61  | B17.2 | GPIO2_58  | |
| 62  | B17.3 | GPIO2_59  | |
| 63  | B17.4 | GPIO2_60  | |
| 64  | B17.5 | GPIO2_61  | |
| 65  | B17.6 | GPIO2_62  | |
| 66  | B17.7 | GPIO2_63  | |
| 67  | B18.0 | GPIO2_64  | |
| 68  | B18.1 | GPIO2_65  | |
| 69  | B18.2 | GPIO2_66  | |
| 70  | B18.3 | GPIO2_67  | |
| 71  | B18.4 | GPIO2_68  | |
| 72  | B18.5 | GPIO2_69  | |
| 73  | B18.6 | GPIO2_70  | |
| 74  | B18.7 | GPIO2_71  | |
| 75  | B19.0 | GPIO2_72  | |
| 76  | B19.1 | GPIO2_73  | |
| 77  | B19.2 | GPIO2_74  | |
| 78  | B19.3 | GPIO2_75  | |
| 79  | B19.4 | GPIO2_76  | |
| 80  | B19.5 | GPIO2_77  | |
| 81  | B19.6 | GPIO2_78  | |
| 82  | B19.7 | GPIO2_79  | |
| 83  | B20.0 | GPIO2_80  | |
| 84  | B20.1 | GPIO2_81  | |
| 85  | B20.2 | GPIO2_82  | |
| 86  | B20.3 | GPIO2_83  | |
| 87  | B20.4 | GPIO2_84  | |
| 88  | B20.5 | GPIO2_85  | |
| 89  | B20.6 | GPIO2_86  | |
| 90  | B20.7 | GPIO2_87  | |
| 91  | B21.0 | GPIO2_88  | |
| 92  | B21.1 | GPIO2_89  | |
| 93  | B21.2 | GPIO2_90  | |
| 94  | B21.3 | GPIO2_91  | |
| 95  | B21.4 | GPIO2_92  | |
| 96  | B21.5 | GPIO2_93  | |
| 97  | B21.6 | GPIO2_94  | |
| 98  | B21.7 | GPIO2_95  | |
| 99  | B22.0 | GPIO2_96  | |
| 100 | B22.1 | GPIO2_97  | |
| 101 | B22.2 | GPIO2_98  | |
| 102 | B22.3 | GPIO2_99  | |
| 103 | B22.4 | GPIO2_100 | |
| 104 | B22.5 | GPIO2_101 | |
| 105 | B22.6 | GPIO2_102 | |
| 106 | B22.7 | GPIO2_103 | |
| 107 | B23.0 | GPIO2_104 | |
| 108 | B23.1 | GPIO2_105 | |
| 109 | B23.2 | GPIO2_106 | |
| 110 | B23.3 | GPIO2_107 | |
| 111 | B23.4 | GPIO2_108 | |
| 112 | B23.5 | GPIO2_109 | |
| 113 | B23.6 | GPIO2_110 | |
| 114 | B23.7 | GPIO2_111 | |
| 115 | B24.0 | GPIO2_112 | |
| 116 | B24.1 | GPIO2_113 | |
| 117 | B24.2 | GPIO2_114 | |
| 118 | B24.3 | GPIO2_115 | |
| 119 | | GND  | System GND|
| 120 | | GND  | System GND|