Chapter 3
Analog Output Timing/Control
DAQ-STC Technical Reference Manual
3-96
©
National Instruments Corporation
3.7.7 Local Buffer Mode Timing
The DAQ-STC supports a local buffer mode for analog output, which reduces analog output
bus usage to zero. The desired waveform is written into the data FIFO, and the buffer is
repeated a number of times. The primary signals are UPDATE, TMRDACWR,
AO_ADDR<0..3>, AOFFRT, and AOFEF. The UPDATE, TMRDACWR, and
AO_ADDR<0..3> signals operate identically to the basic analog output case. The AOFEF
signal is the data FIFO empty flag, and the AOFFRT signal asserts the retransmit signal on
the FIFO. When the FIFO becomes empty, the DAQ-STC asserts the AOFFRT signal, which
sets the FIFO read pointer back to the first location of the FIFO. The waveform can then be
output again, as shown in Figure 3-20.
