NB2DSK01 - Buzzer Signal

Frozen Content

Modified by Admin on Nov 6, 2013

As part of its audio capabilities, the NB2DSK01 provides a hardwired path for a mono-based audio signal from the daughter board FPGA. This signal – a legacy NB1-style Buzzer signal – can be incorporated as input to the NB2DSK01's analog audio mixer.

The Buzzer signal is input to only the right channel of the NB2DSK01's audio power amplifier. By using only the right channel, the digital noise generated by the FPGA in a sigma-delta configuration is reduced, as there is one less speaker emitting noise. When using the NB2DSK01's audio system with just this signal, output is relayed to only the right-channel speaker of the attached Desktop Stereo Speaker Assembly NB2DSK-SPK01.

Schematic Reference

The Buzzer signal input to the analog mixer can be found on Sheet 65 (AUDIO_AMP_NB2A.SchDoc, entitled AUDIO SUB-SYSTEM) of the motherboard schematics.

Design Interface Component

Table 1 summarizes the available design interface component that can be placed from the FPGA NB2DSK01 Port-Plugin.IntLib, to provide a mono audio signal from the FPGA design, using the NB2DSK01's hardwired Buzzer signal.

Table 1. Buzzer signal port-plugin component.

Component Symbol	Component Name	Description
	`SPEAKER`	Place this component to send a mono-based audio signal from your FPGA design, to the NB2DSK01's audio system.