Clocking Features - 1.0 English

The first tab of the GUI allows you to identify the required features of the clocking network and configure the input clocks.

Figure 1. Clocking Features

Selecting Clocking Features

The available clocking features are shown for the selected target device. You can select as many features as desired; however, some features consume additional resources, and some can result in increased power consumption. Additionally, certain combinations of features are not allowed. When using IP Integrator, frequency, phase, and clock domain properties of the output clocks are automatically propagated and any change in input clock properties reflect on all the outputs.

Note: The Port Renaming tab has been removed from the Clocking Wizard Interface as the IP does not support the renaming of ports in the IP Integrator.

Configuring Input Clocks

The above options are unselected in Auto Primitive selection. There are two input clocks available and depending on your selection, the reference clock can be switched from one to another. The GUI provides an option to select the secondary input clock to enable the additional input clock.

You can select the buffer type that drives the input clock, and this is then instantiated in the provided source code. If the input buffers are located externally, selecting No Buffer leaves the connection blank. If Phase Alignment is selected, you will not have access to pins that are not dedicated clock pins because the skew introduced by a non-clock pin is not matched by the primitive. You can choose the units for input clock jitter by selecting either the UI or PS drop-down menu. The input jitter box accepts values based on this selection.

In the IP Integrator, when the Clocking Wizard IP is selected to target a board part, the frequency values that are generated to the primary and secondary clocks are displayed in a floating number format. For example, if the primary clock frequency is 100 MHz, then it displays as 100.000 instead of 100.