GX1649-1 Arbitrary Waveform Generation

The GX1649-1 features two mechanisms for Arbitrary Waveform Generation.  If the data in a pattern is known completely before the waveform is needed, the data can be loaded to a RAM.  When triggered, will continuously output the data looping through the samples until the waveform generator is disarmed. If the data in the pattern is generated ‘on-the-fly’ or if the RAM is too small to fit all of the data at once, the streaming option is a better option, and the on-board FIFO will be used to stream the waveform.

Fixed Waveform Generation

The following figure shows loading a waveform to the RAM:

GX1649-1 Waveform Generation

• Configure the ARB group that we will output the waveform from. (GxAoArbSetGroupClock, GxAoArbSetGroupChannels)

• Write data to RAM (GxAoArbWriteChannelWaveform)

• Arm and Trigger the board to start waveform (GxAoArbArmGroup, GxAoArbTrigGroup)

• When the waveform playback is completed, it should be disarmed (GxAoArbArmGroup)

Streaming Waveform Generation

The following figure shows streaming a waveform:

GX1649-1 Streaming a Waveform

• Enable group streaming to change the waveform generation sampler to read from the FIFO instead of RAM. (GxAoArbEnableGroupStreaming)

• Configure the ARB group that we will output the waveform from. (GxAoArbSetGroupClock, GxAoArbSetGroupChannels)

• Write some data to the FIFO. (GxAoArbWriteStreamingData)

• Setup the callback procedure that will refill your FIFO as it empties and enable the board to generate interrupts. (GxAoArbSetupStreamingInterrupt, GxAoArbResumeStreamingInterrupt)

• Arm and Trigger the board to start waveform (GxAoArbArmGroup, GxAoArbTrigGroup)

• When the waveform playback is completed, the interrupt should be disarmed (GxAoArbDisableStreamingInterrupt)