Cirrus Logic CDB5490U - Manual (Page 21)

CDB5490U
DS923DB5 21
2.5.1.1 Refresh Screen Button
The Refresh Screen button will update the contents of the screen by reading all the register values from
the CS5490. It is a good idea to press the Refresh Screen button when entering the Setup window, or
after modifying any registers, to reflect the current status of the CS5490.
2.5.1.2 Reset DUT Button
The Reset DUT button will software-reset the CS5490. The CS5490 will perform a software-reset, as dis-
cussed in the CS5490 data sheet. After the software reset to the CS5490 device, the screen contents will
be automatically refreshed with the updated status of the CS5490.
2.5.1.3 Save Config and Load Config Buttons
Clicking the Save Config button will save the current setup widow's configuration to a .txt file. Clicking the
Load Config button will recall a saved configuration and store values into the CS5490.
2.5.1.4 CS5490 MCLK Frequency
The CS5490 accepts a wide range of MCLK input frequencies, and can therefore run at many different
sample rates. The frequency being used on the CS5490 should be entered in this box to provide accurate
frequency calculation in the FFT window. This will also help the software decide which functions the eval-
uation system can perform reliably.
2.5.1.5 Configuration Registers
In the Config0, Config1, and Config2 register boxes, the contents of the CS5490's configuration registers
can be modified by typing a hexadecimal value in the HEX field, or by changing any of the values below
the HEX field to the desired settings. Although the CDB5490U software allows the user to modify any of
the bits in the configuration registers, changing certain reserved bits, such as the NO_OSC bit of Config0,
may cause the software and board to behave erratically. This applies only to the CDB5490U evaluation
system, and not to the CS5490 chip itself.
2.5.1.6 Pulse Control Register
The Pulse Control Register section is used to make changes to and display the contents of the CS5490's
PulseCtrl register. The PulseCtrl register contains various bits that are used to select the input to each
energy pulse generation block within the CS5490. Refer to the CS5490 data sheet for descriptions of the
bits. The value of the PulseCtrl register is displayed in hexadecimal format. Most of the PulseCtrl register
bits are reserved or unused. Only the usable bits are displayed in the Setup Window.
2.5.1.7 Pulse Width and Pulse Rate Registers
The Pulse Width Register section is used to make changes to and display the contents of the CS5490's
PulseWidth register. The PulseWidth register is used to define the frequency range and pulse width of the
energy pulses generated by the CS5490. The PulseWidth register should be configured before setting the
PulseRate register. The Pulse Rate Register section is used to make changes to and display the contents
of the CS5490's PulseRate register. The PulseRate register defines the full-scale frequency of the energy
pulses generated by the CS5490.