Connections

An overview of the extension connectors (see also here) is given in the following image

Connectors

The project uses most but not all connections that are used in the original RedPitaya image. From the connector E2 only the analog inputs and outputs are used. From the connector E1 several pins are reserved for the following purposes:

DIO0_P for the ADC and DAC trigger. Connect it with the master's DIO5_P to distribute the trigger signal to all RedPitayas in a cluster. As long as the input is high, the DACs and ADCs are running.
DIO1_P is the input for the watchdog (see configuration register section for further details)
DIO2_P is used to acknowledge a received watchdog signal.
DIO3_P can be set to high, to stop all DACs instantly.
DIO4_P outputs a high for 10 ms after a 100 ms pause on low to provide an alive signal.
DIO5_P can be set to high via the configuration register to provide the mutual trigger signal.
DIO7_P, DIO7_N, DIO6_P, DIO6_N, DIO5_N, DIO4_N, DIO3_N, DIO2_N can be used as arbitrary outputs set via the server.
DIO2_N (LSB) to DIO4_N (MSB) can output a 3-bit counter configurable by counterSamplesPerStep! (deactivate with 0)
DIO0_N and DIO1_N are used for the clock selection in a cluster.