====== Pmod connectors ======

The GECKO4-Education platform contains two double row Pmod connectors (PMOD1,PMOD2) and one "extended" single row Pmod connector (PMOD3) as indicated in the below figure.

{{ :gecko4education:pmod.png?200 |}}

===== General information =====
<note warning>All I/O pins and clock pins of the Pmod connectors are 3.3V compliant. In case of using the I/O pin(s) as input(s), or using a(the) clock input(s), make sure that the voltage levels are within 0V..3.3V, otherwise you might damage the FPGA!</note>
<note important>Make sure that the current drawn on the 3.3V supply of the Pmod connectors does not exceed a total of 250mA. Exceeding this limit may force a malfunctioning of the board or in extreme cases destroy it.</note>
The Pmod Interface specifications can be found [[https://www.digilentinc.com/Pmods/Digilent-Pmod_%20Interface_Specification.pdf|here]]. A list of available Pmod modules is available [[http://digilentinc.com/pmods/|here]].

===== Double row PMOD connectors information =====

The below tables indicate the pin-out of the both double row Pmod connectors. And {{:gecko4education:pmod.tcl|here}} you find an example tcl script that can be used for pin-assignment of the I/O pins in Quartus.

**PMOD1 pin-out:**
|Pin number:|1     |2     |3     |4     |5  |6  |7     |8     |9     |10    |11 |12 |
|Function:  |I/O 1 |I/O 2 |I/O 3 |I/O 4 |GND|3V3|I/O 7 |I/O 8 |I/O 9 |I/O 10|GND|3V3|
|FPGA Pin:  |PIN_F2|PIN_E3|PIN_C2|PIN_B2|   |   |PIN_F1|PIN_E4|PIN_C1|PIN_B1|   |   |

\\
**PMOD2 pin-out:**
|Pin number:|1     |2     |3     |4     |5  |6  |7     |8     |9     |10    |11 |12 |
|Function:  |I/O 1 |I/O 2 |I/O 3 |I/O 4 |GND|3V3|I/O 7 |I/O 8 |I/O 9 |I/O 10|GND|3V3|
|FPGA Pin:  |PIN_G5|PIN_G4|PIN_G3|PIN_H2|   |   |PIN_H1|PIN_J3|PIN_J2|PIN_J1|   |   |


===== Single row Pmod "extended" connector information =====
The below table indicates the pin-out of the single row Pmod "extended" connector. And {{:gecko4education:pmod_ext.tcl|here}} you find an example tcl script that can be used for pin-assignment of the I/O pins in Quartus.

The Pmod "extended" connector has been extended with two extra pins that are directly connected to clock-inputs of the FPGA. In this way two external clock sources can be used to synchronize an external system with the FPGA.

**PMOD3 pin-out:**
|Pin number:|1       |2       |3       |4       |5  |6  |7       |8       |
|Function:  |I/O 1   |I/O 2   |I/O 3   |I/O 4   |GND|3V3|CLK 1   |CLK 2   |
|FPGA Pin:  |PIN_AA16|PIN_AB16|PIN_AA15|PIN_AB15|   |   |PIN_AA12|PIN_AB12|



<note important>When using a standard single row Pmod module make sure that the PCB of this module shows to the left-hand side of the GECKO4-Education board (the PCB-position is marked by a fat-white-line left of PMOD3) and that the two clock pins are not connected by one of the pins of the Pmod module.</note>