National Instruments AT-MIO-16X - Manual (Page 218)

Chapter 6 Calibration Procedures
AT-MIO-16X User Manual 6-6 © National Instruments Corporation
Figure 6-4. ADC and DAC FIFO Depth Field
If the ADC and DAC FIFO Depth Field contains the binary value
00010011, then the AT-MIO-16X board that was accessed contains an
ADC FIFO buffer of depth 512 and a DAC FIFO buffer of depth 2,048.
This information is extremely useful in determining how many values
to read from the ADC FIFO or write to the DAC FIFO when a half-full
interrupt is generated. For example, if it is known that the ADC FIFO is
512 values deep and a half-full interrupt is generated, then 256 values
can be read in at once without checking the Status Register 0 to see if
the FIFO contains values. Alternately, if the DAC FIFO is 2,048 values
deep and a half-full interrupt is generated, then 1,024 values can be
read. This can have a significant performance impact on software speed.
Figure 6-5. Area Information Field
If the Area Information Field contains the binary value XXXXX101
where X indicates don’t care bits, then the area described by this area
information value contains bipolar DAC 1 calibration constants,
unipolar DAC 0 calibration constants, and bipolar ADC calibration
constants. The area information value for the factory bipolar area will
always be XXXXX111, and for the factory unipolar area it will always
0 1 2 7 3 4 5 6
ADC FIFO Length DAC FIFO Length
LSB MSB
0110 = 16,384
0010 = 1,024
0001 = 512
0000 = 256
0101 = 8,192
0100 = 4,096
0011 = 2,048
0110 = 16,384
0010 = 1,024
0001 = 512
0000 = 256
0101 = 8,192
0100 = 4,096
0011 = 2,048
0 1 2 7 3 4 5 6
Reserved
Reserved
Reserved
Reserved
Reserved
DAC 1 Range
DAC 0 Range
ADC Range
LSB MSB