There are several changes to the GUI and the wizard use model as described in the following subsections.
The old wizards required you to choose the correct GUI (DCM or PLL) before configuring the desired primitive.
The new Clocking Wizard automatically selects the appropriate primitive and configures it based on desired parameters. You can choose to override this choice in the event that multiple primitives are available, as is the case for the Spartan®-6 device family.
Symbol Pin Activation
The old wizards had a symbol with clickable pins to enable a port.
For the new Clocking Wizard, the symbol shows the ports that are currently
active. To enable a port, enable the appropriate feature in the GUI. For example, enabling
the secondary input clock enables the
CLK_IN_SEL ports and activates those ports in the symbol.
The new Clocking Wizard allows you to override any calculated parameter within the wizard by switching to override mode.
Port Display Conventions
The new Clocking Wizard displays the superset of ports covering all device families. Ports that are not available for the selected target device are dimmed out. Information on the legal ports for a specific primitive can be found in the device family-specific FPGA or clocking resources on the Xilinx Support web page.
Visibility of Clock Ports
The new Clocking Wizard provides a clocking network that matches the your
requirements rather than making clock ports visible. As a result, your clock names will not
match the exact names for the primitive. For example, while the “first” clock available for
the MMCM is
CLKOUT0, the highest priority clock available
to you is actually named
GUI Information Gathering Order
- Select the clocking features.
- Configure the input clock parameters.
- Configure the output clock parameters.
- Choose feedback and optional ports.
- View (and optionally override) calculated parameters.
- Final summary pages.