User`s guide

Operation Theorem  43
Note that the two D/A channels could be in double buffered mode or in the
transparency mode. In the transparency mode, the operation of the two D/A
channels are independent. The analog out signal will real-time response the
digital value written into the DACs. However, in the double buffered, the
digital value of each channels is double buffered. That means the analog out
signal of both the two channels will response the digital value only when
channel #2 is written and the analog signal update in the same time. The
benefit the double buffered mode is that the power on voltage of the analog
output is controllable. It will be 0 volts. However, the power on voltage of
the analog output can not be guaranteed in transparency mode.
The default setting of the DA channels is the double buffered mode.
However, the user can change it to transparency mode after power on.
Please refer the section 3.12 for the DA output mode control.