DAQ VXI-SC-1102 Manual de instrucciones descargar pdf (Pagina 47)

Chapter 5 AT-AO-6/10 Analog Output Devices

DAQ Hardware Overview Guide 5-2 www.ni.com

generate continuous waveform. Thus, no interrupt service or DMA

operation is required to transfer more data to the FIFO.

The following conditions must be satisfied to use FIFO mode waveform

generation:

• The waveform buffer fits in the DAC FIFO.

• Double-buffered waveform generation mode is disabled.

• The number of iterations is equal to 0 (continuous).

Note This mode is available for group 1 only.

Hardware Restrictions for the AT-AO-6/10

The following hardware restriction applies to the AT-AO-6/10:

• You cannot split channel pairs between groups (channel pairs are 0

and 1, 2 and 3, 4 and 5, and so on). For example, you can assign

channel 4 alone to group 1, but you cannot then assign channel 5 to

group 2.

AT-AO-6 group 1 assignments are as follows:

•0 to n, where n ≤ 5 and the channel list is consecutive, or any one

channel.

• Uses interrupts/DMA with FIFO.

• Interrupt when the FIFO is half full; thus, group 1 will be faster than

group 2, even when interrupts are used for both.

• If more than one channel is in the channel list, channel 0 must be the

first channel in that list.

AT-AO-6 group 2 assignments are as follows:

• Channels 0 or 1 cannot be in group 2.

• Uses interrupts only.

AT-AO-10 group assignments are as follows:

• All rules of assignment for the AT-AO-6 apply to the AT-AO-10.

•0 to n, where n ≤ 9 and the channel list is consecutive, or any one

channel.

• If exactly one channel is assigned to group 1, it cannot be channel 8

or 9.

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DAQ VXI-SC-1102 Manual de instrucciones Pagina 47