Agilex™ 7 Clocking and PLL User Guide: M-Series

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ID 769001
Date 10/09/2025
Public
Document Table of Contents
Document Table of Contents x
1. Agilex™ 7 FPGA M-Series Clocking and PLL Overview 2. M-Series Clocking and PLL Architecture and Features 3. M-Series Clocking and PLL Design Considerations 4. Clock Control IP Core 5. IOPLL IP Core 6. I/O PLL Reconfiguration 7. Agilex™ 7 Clocking and PLL User Guide: M-Series Archives 8. Document Revision History for the Agilex™ 7 Clocking and PLL User Guide: M-Series
1. Agilex™ 7 FPGA M-Series Clocking and PLL Overview x
1.1. Clock Networks Overview 1.2. PLLs Overview
2. M-Series Clocking and PLL Architecture and Features x
2.1. Clock Networks Architecture and Features 2.2. PLLs Architecture and Features
2.1. Clock Networks Architecture and Features x
2.1.1. Clock Network Architecture 2.1.2. Clock Resources 2.1.3. Clock Control Features
2.1.1. Clock Network Architecture x
2.1.1.1. Clock Network Hierarchy 2.1.1.2. Clock Sectors 2.1.1.3. Programmable Clock Routing
2.1.3. Clock Control Features x
2.1.3.1. Clock Gating 2.1.3.2. Clock Divider
2.1.3.1. Clock Gating x
2.1.3.1.1. Root Clock Gate 2.1.3.1.2. Sector Clock Gate 2.1.3.1.3. I/O PLL Clock Gate 2.1.3.1.4. LAB Clock Gate
2.2. PLLs Architecture and Features x
2.2.1. PLL Features 2.2.2. PLL Usage 2.2.3. PLL Locations 2.2.4. PLL Architecture 2.2.5. PLL Control Signals 2.2.6. PLL Feedback Modes 2.2.7. Clock Multiplication and Division 2.2.8. Programmable Phase Shift 2.2.9. Programmable Duty Cycle 2.2.10. PLL Cascading 2.2.11. PLL Input Clock Switchover 2.2.12. PLL Reconfiguration and Dynamic Phase Shift 2.2.13. PLL Calibration
2.2.5. PLL Control Signals x
2.2.5.1. Reset 2.2.5.2. Locked
2.2.6. PLL Feedback Modes x
2.2.6.1. Direct Compensation Mode 2.2.6.2. LVDS Compensation Mode 2.2.6.3. Source Synchronous Compensation Mode 2.2.6.4. Normal Compensation Mode 2.2.6.5. Zero-Delay Buffer Mode 2.2.6.6. External Feedback Mode
2.2.11. PLL Input Clock Switchover x
2.2.11.1. Automatic Switchover 2.2.11.2. Automatic Switchover with Manual Override 2.2.11.3. Manual Clock Switchover
2.2.13. PLL Calibration x
2.2.13.1. Power-Up Calibration 2.2.13.2. User Calibration 2.2.13.3. Static Phase Error Calibration 2.2.13.4. Output Clock Duty Cycle Correction
3. M-Series Clocking and PLL Design Considerations x
3.1. Guidelines: Clock Switchover 3.2. Guidelines: Timing Closure 3.3. Guidelines: Resetting the PLL 3.4. Guidelines: Configuration Constraints 3.5. Clocking Constraints 3.6. IP Core Constraints 3.7. Guideline: Achieving 5% Duty Cycle for fOUT_EXT ≥ 300 MHz Using tx_outclk Port from LVDS SERDES IP
4. Clock Control IP Core x
4.1. Release Information for Clock Control IP 4.2. Clock Control IP Core Parameters 4.3. Clock Control IP Core Ports and Signals
5. IOPLL IP Core x
5.1. Release Information for IOPLL IP 5.2. IOPLL IP Core Parameters 5.3. IOPLL IP Core Ports and Signals
5.2. IOPLL IP Core Parameters x
5.2.1. IOPLL IP Core Parameters - PLL Tab 5.2.2. IOPLL IP Core Parameters - Settings Tab 5.2.3. IOPLL IP Core Parameters - Cascading Tab 5.2.4. IOPLL IP Core Parameters - Advanced Parameters Tab
6. I/O PLL Reconfiguration x
6.1. Implementing I/O PLL Reconfiguration using EMIF Calibration IP 6.2. Address Bus and Data Bus Settings
6.1. Implementing I/O PLL Reconfiguration using EMIF Calibration IP x
6.1.1. Release Information for EMIF Calibration IP 6.1.2. Setting Up the IOPLL IP 6.1.3. Setting Up the EMIF Calibration IP 6.1.4. Connectivity Between IOPLL FPGA IP and EMIF Calibration IP 6.1.5. Axilite Interface Ports in the EMIF Calibration IP 6.1.6. Reconfiguration Guideline for I/O PLLs 6.1.7. Design Example for I/O PLL Reconfiguration
6.1.6. Reconfiguration Guideline for I/O PLLs x
6.1.6.1. Enabling Reconfiguration for The Desired I/O PLL 6.1.6.2. Clearing off Calibration Statuses 6.1.6.3. Reconfiguring The I/O PLL 6.1.6.4. Recalibration of I/O PLL 6.1.6.5. Clock Gating (Optional)
6.1.7. Design Example for I/O PLL Reconfiguration x
6.1.7.1. Reconfiguration Option: Reconfiguration Through EMIF Calibration IP 6.1.7.2. Reconfiguration Option: Clock Gating Reconfiguration
6.2. Address Bus and Data Bus Settings x
6.2.1. Divide Settings and the Corresponding Data Bit Setting for Reconfiguration 6.2.2. Data Bus Setting for Clock Gating Reconfiguration 6.2.3. Data Bus Setting For Charge Pump Current
1. Agilex™ 7 FPGA M-Series Clocking and PLL Overview
2. M-Series Clocking and PLL Architecture and Features
3. M-Series Clocking and PLL Design Considerations
4. Clock Control IP Core
5. IOPLL IP Core
6. I/O PLL Reconfiguration
7. Agilex™ 7 Clocking and PLL User Guide: M-Series Archives
8. Document Revision History for the Agilex™ 7 Clocking and PLL User Guide: M-Series

2.1.3.1.3. I/O PLL Clock Gate

You can dynamically gate each output counter of the M-Series I/O PLL. This I/O PLL clock gate provides a useful alternative to the root clock gate. The root clock gate can gate only 1 of 7 output counters.

However, the I/O PLL clock gate is not cycle-specific. When you use the I/O PLL clock gate, expect a delay of several clock cycles between the assertion or deassertion of the clock gate and the corresponding change to the clock signal. The number of delay cycles is non-deterministic because the enable signal must be synchronized into the clock domain of the output clock, ensuring a glitch-free gate.

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