Visible to Intel only — GUID: iga1401400702310
Ixiasoft
Visible to Intel only — GUID: iga1401400702310
Ixiasoft
29.4. Instantiating the PLL Core
PLL Settings Page
The PLL Settings page contains a button that launches the ALTPLL MegaWizard Plug-In Manager. Use the MegaWizard Plug-In Manager to parameterize the ALTPLL IP core. The set of available parameters depends on the target device family.
You cannot click Finish in the PLL wizard nor configure the PLL interface until you parameterize the ALTPLL IP core.
Interface Page
The Interface page configures the access modes for the optional advanced PLL status and control signals.
For each advanced signal present on the ALTPLL IP core, you can select one of the following access modes:
- Export—Exports the signal to the top level of the Platform Designer system module.
- Register—Maps the signal to a bit in a status or control register.
The advanced signals are optional. If you choose not to create any of them in the ALTPLL MegaWizard Plug-In, the PLL's default behavior is as shown in below.
You can specify the access mode for the advanced signals shown in below. The ALTPLL core signals, not displayed in this table, are automatically exported to the top level of the Platform Designer system module.
Table 284. ALTPLL Advanced Signal ALTPLL Name Input / Output Avalon® -MM PLL Wizard Name Default Behavior Description areset input PLL Reset Input The PLL is reset only at device configuration. This signal resets the entire Platform Designer system module, and restores the PLL to its initial settings. pllena input PLL Enable Input The PLL is enabled. This signal enables the PLL. pllena is always exported.
pfdena input PFD Enable Input The phase-frequency detector is enabled. This signal enables the phase-frequency detector in the PLL, allowing it to lock on to changes in the clock reference. locked output PLL Locked Output — This signal is asserted when the PLL is locked to the input clock. Asserting areset resets the entire Platform Designer system module, not just the PLL.
Finish
Click Finish to insert the PLL into the Platform Designer system. The PLL clock output(s) appear in the clock settings table on the Platform Designer System Contents tab.
If the PLL has external output clocks, they appear in the clock settings table like other clocks; however, you cannot use them to drive components within the Platform Designer system.
For details about using external output clocks, refer to the ALTPLL IP Core User Guide.
The Platform Designer automatically connects the PLL's reference clock input to the first available clock in the clock settings table.
If there is more than one Platform Designer system clock available, verify that the PLL is connected to the appropriate reference clock.