====== Arduino compatible connector ======
The GECKO4-Education board has an Arduino Mega compatible connector architecture on it's back-side as shown in the below figure.

{{ :gecko4education:gecko4_education_bottom_large.jpg?200 |}}

===== General Information =====
<note warning>All digital signals on the Arduino connectors are 3.3V compliant. Never connect a digital output to these pins that has higher voltage levels (e.g. 5V) as this will certainly destroy the FPGA!</note>
<note important>For all analog pins please refer to the datasheets of the ADC and DAC that can be found [[gecko4education:adcdac|here]]</note>.

===== Power and reference =====
The GECKO4-Education can be powered by applying an external power supply to the Vin pin on the power connector. The voltage that can be applied on the Vin pin must be in between 6.5V and 20V. Note however, the higher this voltage the warmer the LDO (Low Drop Out regulator) on the top of the GECKO4-Education gets. In case an external voltage is applied on the Vin pin the GECKO4-Education will automatically switch to this power supply and will decouple the USB-power.

The GECKO4-Education provides two voltages on the power connector, namely 3.3V and 5V. The maximal total current drawn from these supplies are listed in the below table. Note that you also have to take into account the current drawn from eventual connected [[gecko4education:pmod|Pmod]] modules!
^Supply	^USB-powered	^Vin-powered^
|3.3V	|max. 250 mA	|max. 500 mA|
|5V	|max. 160 mA	|max. 400 mA|

Finally the GECKO4-Education board provides the pin AREF to be used as analog reference voltage. More information on this pin can be found [[gecko4education:adcdac|here]].

===== Analog connections =====
The GECKO4-Education board provides fourteen analog inputs (ADC0...ADC13) on the //ANALOG IN// connectors. The pin ADC0 is connected on the input of the ADC with address 0, ADC1 on the input of the ADC with address 1, etc. More information on the ADC can be found [[gecko4education:adcdac|here]].

The GECKO4-Education board also provides two digital outputs (DAC0 and DAC1) on the //NC// pins of the Arduino //POWER// connector. DAC0 is connected to channel 0 of the DAC, and DAC1 is connected to channel 1. More information on the DAC can be found [[gecko4education:adcdac|here]].

===== Digital connections =====
The GECKO4-Education board provides a multitude of digital connections. The below sections will list them all and list also the FPGA-connections.

**PWM:**

The //PWM// section contains fourteen digital I/O connections. The below table lists those connections and their respective connections to the FPGA. {{ :gecko4education:pwm.tcl |Here}} you find a tcl-script that can be used with Quartus.
^Name:	^PE0	^PE1	^PE4	^PE5	^PG5	^PE3	^PH3^
|Arduino name:	|0	|1	|2	|3	|4	|5	|6|
|FPGA pin:	|PIN_M16	|PIN_M19	|PIN_N16	|PIN_N17	|PIN_P20	|PIN_R22	|PIN_R21|
|Name:	|PH4	|PH5	|PH6	|PB4	|PB5	|PB6	|PB7|
|Arduino name:	|7	|8	|9	|10	|11	|12	|13|
|FPGA pin:	|PIN_R20	|PIN_U22	|PIN_W22	|PIN_W21	|PIN_W20	|PIN_V21	|PIN_V22|

**Communication:**

The //COMMUNICATION// section contains eight digital connections. The below table lists those connections and their respective connections to the FPGA. {{ :gecko4education:communication.tcl |Here}} you find a tcl-script that can be used with Quartus.
^Name:	^PD0	^PD1	^PD2	^PD3	^PH0	^PH1	^PJ0	^PJ1^
|Arduino name:	|21	|20	|19	|18	|17	|16	|15	|14|
|FPGA pin:	|PIN_M22	|PIN_M21	|PIN_M20	|PIN_N22	|PIN_N21	|PIN_N20	|PIN_P22	|PIN_P21|

**Digital:**

The //DIGITAL// section contains besides two 5V and two GND pins also thirtytwo digital connections. The below table lists those connections and their respective connections to the FPGA. {{ :gecko4education:digital.tcl |Here}} you find a tcl-script that can be used with Quartus.
^Name:	^Arduino name:	^FPGA pin:		^Name:	^Arduino name:	^FPGA pin:^
|PA0	|22	|PIN_P16		|PA1	|23	|PIN_T17|
|PA2	|24	|PIN_P17		|PA3	|25	|PIN_T18|
|PA4	|26	|PIN_R18		|PA5	|27	|PIN_T16|
|PA6	|28	|PIN_R19		|PA7	|29	|PIN_T15|
|PC7	|30	|PIN_N15		|PC6	|31	|PIN_R17|
|PC5	|32	|PIN_N14		|PC4	|33	|PIN_R16|
|PC3	|34	|PIN_P15		|PC2	|35	|PIN_R15|
|PC1	|36	|PIN_P14		|PC0	|37	|PIN_R14|
|PD7	|38	|PIN_U19		|PG2	|39	|PIN_U15|
|PG1	|40	|PIN_V16		|PG0	|41	|PIN_V15|
|PL7	|42	|PIN_W19		|PL6	|43	|PIN_W17|
|PL5	|44	|PIN_Y17		|PL4	|45	|PIN_W15|
|PL3	|46	|PIN_AA19		|PL2	|47	|PIN_AB19|
|PL1	|48	|PIN_AA18		|PL0	|49	|PIN_AB18|
|PB3	|50	|PIN_AA17		|PB2	|51	|PIN_AB17|
|PB1	|52	|PIN_U12		|PB0	|53	|PIN_T12|
**Extra:**

Finally the GECKO4-education board provides another five  digital connections. The below table lists those connections and their respective connections to the FPGA. {{ :gecko4education:extra.tcl |Here}} you find a tcl-script that can be used with Quartus.
^Name:	^PDD0	^PDD1	^CRX	^CTX	^nRst^
|FPGA pin:	|PIN_U20	|PIN_U21	|PIN_AA14	|PIN_AB14	|PIN_Y13|