Analog Devices EVAL-AD9959 User Manual page 15

User Guide
EVALUATION BOARD SOFTWARE
3. Profile and RURD Pin Control
The Profile and RURD Pin Control section covers the profile pins
(P0, P1, P2, and P3) and SDIO data pins (SDIO1, SDIO2, and
SDIO3). The profile pins can be configured to control modulation,
linear sweep, or RU/RD operations, whereas the SDIO data pins
can only control the RU/RD operation. To perform the desired mod-
ulation, linear sweep, or RU/RD operation, toggle the profile/SDIO
data pin(s) associated with that operation. When these pins are
pressed, they are set to Logic 1 (see
Figure 29.
Upon default, the Auto box is checked, meaning that once you click
one of the pins (profile or SDIO), the action executes. If this box
is unchecked, the Apply button must be clicked before the desired
action is carried out. The Apply button mimics the LOAD button; it
will flash orange when new data is detected, but all changes and
updates occur simultaneously when Apply is clicked.
If we were performing 2-level frequency modulation-no RU/RD, and
had the same configurations as shown in
used to control the modulation on CH0 (see the AD9959 data sheet
for more information). Therefore, the output of CH0 will stay at 10
MHz until the P0 button is clicked. Once the P0 button is selected,
the frequency will change to 50 MHz. To return to 10 MHz, simply
release (unclick) P0.
For more information regarding the use of the profile and SDIO
data pins to control various modulation, linear sweep, and RU/RD
schemes, refer to the Modes of Operation section of the
data sheet.
4. Linear Sweep Setup
Use the Linear Sweep Setup section to setup the slope of the
linear sweep. In the Rising Step Size box, enter the desired value
for the rising step size. Input the amount of time you wish to be
spent at each step in the Rising Step Interval box.
Input the desired falling step size in the Falling Step Size box,
and the time that should be spent at each step in the Falling Step
Interval box. The Rising/Falling Step Size boxes are similar to the
Profile Registers; upon default, they are set up for frequency inputs,
but these boxes can be changed to intake phase or amplitude
information by selecting the type of linear sweep desired in the
Modulation Output Type box in the Channel Control window.
The number of steps in a ramp can be calculated by determining
the difference between the starting and ending points of the sweep
and dividing by the step size. The time required to sweep is then
the number of steps times the amount of time spent at each step.
analog.com
Figure 29).
Figure 28, P0 would be
AD9959
The range of the Rising/Falling Step Interval is computed similarly
to the time range for the Amplitude Ramp Rate. Note that the
Rising Step Interval and Falling Step Interval boxes also have the
pop-up window feature exhibited in
rising/falling step interval value is exceeded.
For more information regarding the Linear Sweep Setup, refer to
the Setting the Slope of the Linear Sweep section of the AD9959
data sheet.
DEBUG
The Debug Window, shown in
to any of the AD9959's internal registers and subsequently read
them back. Use View Channel to select which channel's internal
registers you would like to view. The default setting of this box is
Channel 0. To access the internal registers of the selected channel,
use the RegAddr drop menu to select which register(s) you would
like to read/write. You can also directly toggle the states of any
external input pins such as the profile or SDIO data pins.
Figure 30.
To access the Debug Window, click View and select Debug
Window (see Figure 31).
Figure 31.
DUT I/O BOX
This dialog box (Figure 32) controls the I/O configuration for the
device. Click I/O Reset to send an I/O reset to the corresponding
serial port state machine. Select LSB First to change the data
format to LSB first from the default setting of MSB first. Use the
Serial I/O Mode drop menu to select the desired serial I/O mode
of operation: Single Bit-2 Wire (default), Single Bit-3 Wire, 2-Bit
EVAL-AD9959
Figure 25 when the maximum
Figure 30, lets you write directly
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