UG-826

EK1HMC7044LP10B User Guide

Rev. 0 | Page 6 of 10

USING THE SOFTWARE TO CONTROL THE

FUNCTIONAL BLOCKS OF THE HMC7044

Register W/R

The update icon issues a GUI update command by reading all

registers and setting every widget according to read values.

Figure 8. Update Icon

GPIO Controls

The GPIO tab allows the user to control general-purpose

input/output to monitor the alarms/status indicators to

determine the health of the system.

Four GPIO configurations can be controlled from this tab

(see Figure 7).

PLL1 Controls

The PLL1 tab in the main window (see Figure 9) allows the user

to configure the PLL1 parameters.

Figure 9. PLL1 Tab of HMC7044 Evaluation Software GUI

The PLL1 input buffer controls are located on the left side of

the PLL1 tab (see Figure 10). Enable/disable, termination type,

ac coupling, and dc coupling options can be controlled.

The PLL1 input/VCXO prescalers are shown in Figure 11.

Divide ratios of these five prescalers are controllable from this

section. The priority table of PLL1 references are also located in

the INPUT Priority section of this tab.

The PLL1 reference and feedback divider ratios, PFD polarity,

and charge pump current setting controls are shown in Figure 12.

Additional control bits of PLL1 are located at the bottom of the

PLL1

tab, as shown in Figure 13. See the HMC7044 datasheet

for further details on these bits.

Figure 10. PLL1 Input Buffers

Figure 11. PLL1 Input/VCXO Prescalers and Reference MUX

Figure 12. PLL1 Reference and Feedback Divider and Charge Pump