Texas Instruments AFEDRI8201EVM, User Manual, Page: 13 / 25

Software Description
7
AFEDRI8201EVM
3) Operation of the EVM depends upon the settings of the following
parameters:
a) The IF frequency and sampling frequencies are entered as floating
point values. MHz are used as the units, but the actual units do not
matter, as long as the frequency and sampling units are the same. The
software calculates the required register values for the mixer.
b) Phase offset is in degrees and is also a floating point value.
c) Each time you type data into a field, you must hit Enter for the new
value to be activated. The AFEDRI8201EVM is updated as soon as
the field is updated.
d) The Refresh button will rewrite everything (registers and memories)
into the AFEDRI8201EVM. This is useful if you need to change
devices or otherwise power down the EVM board.
e) The memory contents are shown in three lists. To change a value,
double-click on the appropriate line in the list. The values relevant to
that line appear just below the three lists. Type the new value where
indicated and click Change.
f) The Channel A/Channel B radio buttons in the test control section
determine which filter output is sent to the output pins.
g) The control DAC is set to produce a full-scale ramp using the DIN in-
terface. The DAC Value setting under ADC/DAC Control has no effect.
A readback of the DAC value register will return a random value be-
tween 0 and 4095.
h) There are two power-down check boxes. The checkbox under ADC/
DAC Control sets power-down via a register write, whereas the check-
box under Test Control sets the PWD pin high.
4) To save a configuration, click File|Save and enter the name you want to
give the file. The default extension is .afe. The configuration files can also
be edited in a text editor, but be careful to use only a single space as a de-
limiter.