NB2DSK01 - Home-NanoBoard Reset Button

The NB2DSK01 provides a push button switch that is wired to an I/O pin of the NanoTalk Controller FPGA device. The switch is of type SPNO – Single Pole Normally Open. In the open position, it provides a logical High signal to the NanoTalk Controller, changing to logical Low when pressed.

Figure 1. Home/NanoBoard Reset button.

Its purpose is three-fold:

• Press and release quickly to take control of the TFT LCD panel from the daughter board FPGA and present the Home screen of the firmware-driven GUI.

• Press & hold for more than 5 seconds to provide a reset signal to the NanoTalk Controller, used to reset the TSK3000A processor on which the firmware is running.

• While the firmware has control of the TFT LCD panel, press & hold for more than 5 seconds while also holding generic user switches SW1, SW3 and SW5, to access a screen to reset GUI options to default settings. (Note: The generic switches must be kept pressed until the reset screen actually appears).

For more information on the TFT LCD panel and the firmware-driven GUI, see Interacting with the Desktop NanoBoard NB2DSK01.

Location on Board

The switch (designated SW9) is located on the component side of the board, to the top-right of the TFT LCD panel.

Schematic Reference

The switch circuitry can be found on Sheet 57 (HOST_RESET_SPNO.SchDoc, entitled Push Button SPNO Switch) of the motherboard schematics.