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Ixiasoft
Visible to Intel only — GUID: lgq1680720531591
Ixiasoft
2.6. PLL and Clock Network
PLL
Direct PLL migration between Cyclone® V and Agilex™ 5 devices is not possible because of the architectural differences between these two device families.
Agilex™ 5 devices contain the following types of I/O PLLs for core application:
- I/O bank I/O PLL
- Fabric-feeding I/O PLL
However, the Quartus® Prime software determines the I/O PLL type automatically based on the assigned location of the I/O PLL in the Assignment Editor.
The following table compares supported features between Cyclone® V and Agilex™ 5 devices:
Features | Cyclone® V Devices | Agilex™ 5 Devices |
---|---|---|
Integer PLL | Supported | Supported |
Fractional PLL | Supported | Not supported |
C Counter Output | 9 |
|
Dedicated External Clock Output | Supported | Supported 1 |
External Feedback Input Pin | Supported | Supported1 |
Source Synchronous Compensation | Supported | Supported |
Direct Compensation | Supported | Supported |
Normal Compensation | Supported | Supported |
Zero-delay Buffer Compensation | Supported | Supported1 |
External Feedback Compensation | Supported | Supported1 |
LVDS Compensation | Supported | Supported1 |
Programmable Duty Cycle | Supported | Supported |
Bandwidth Settings | Low, Medium, High | Automatically selected by the Quartus® Prime software |
Dynamic Phase Shift |
|
PLL reconfiguration IP only |
PLL Cascading | Supported | Supported 2 |
Output Counter Cascading | Supported | Not supported |
Input Clock Switchover | Supported | Supported2 |
Due to the differences between Cyclone® V and Agilex™ 5 devices, you must identify if Agilex™ 5 devices support the PLL feature when planning to migrate from Cyclone® V devices. For example, Agilex™ 5 devices do not support fractional PLL, so if you need to use this feature for transceiver application, use transceiver PLL (TX PLL). For more information, refer to the Clocking and PLL User Guide: Agilex™ 5 FPGAs and SoCs.
Clock Network
The clock network architecture in Agilex™ 5 devices differ from Cyclone® V device architecture. Agilex™ 5 devices do not have Regional Clock (RCLK) and Periphery Clock (PCLK) networks. The Quartus® Prime Pro Edition software automatically determines the clock regions.
Agilex™ 5 devices use programmable clock tree synthesis for its core clocking function. Programmable clock tree synthesis uses dedicated clock tree routing and switching circuits. These dedicated circuits enable the Quartus® Prime Pro Edition software to create the clock trees your design requires.