External Memory Interfaces Intel® Agilex™ FPGA IP User Guide

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Date 1/31/2022
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Document Table of Contents
Document Table of Contents x
1. About the External Memory Interfaces Intel® Agilex™ FPGA IP 2. Intel® Agilex™ FPGA EMIF IP – Introduction 3. Intel® Agilex™ FPGA EMIF IP – Product Architecture 4. Intel® Agilex™ FPGA EMIF IP – End-User Signals 5. Intel® Agilex™ FPGA EMIF IP – Simulating Memory IP 6. Intel® Agilex™ FPGA EMIF IP – DDR4 Support 7. Intel® Agilex™ FPGA EMIF IP – QDR-IV Support 8. Intel® Agilex™ FPGA EMIF IP – Timing Closure 9. Intel® Agilex™ FPGA EMIF IP – I/O Timing Closure 10. Intel® Agilex™ FPGA EMIF IP – Controller Optimization 11. Intel® Agilex™ FPGA EMIF IP – Debugging 12. External Memory Interfaces Intel® Agilex™ FPGA IP User Guide Archives 13. Document Revision History for External Memory Interfaces Intel® Agilex™ FPGA IP User Guide
1. About the External Memory Interfaces Intel® Agilex™ FPGA IP x
1.1. Release Information
2. Intel® Agilex™ FPGA EMIF IP – Introduction x
2.1. Intel® Agilex™ EMIF IP Protocol and Feature Support 2.2. Intel® Agilex™ EMIF IP Design Flow 2.3. Intel® Agilex™ EMIF IP Design Checklist
3. Intel® Agilex™ FPGA EMIF IP – Product Architecture x
3.1. Intel® Agilex™ EMIF Architecture: Introduction 3.2. Intel® Agilex™ EMIF Sequencer 3.3. Intel® Agilex™ EMIF Calibration 3.4. Intel® Agilex™ EMIF Controller 3.5. User-requested Reset in Intel® Agilex™ EMIF IP 3.6. Intel® Agilex™ EMIF for Hard Processor Subsystem
3.1. Intel® Agilex™ EMIF Architecture: Introduction x
3.1.1. Intel® Agilex™ EMIF Architecture: I/O Subsystem 3.1.2. Intel® Agilex™ EMIF Architecture: I/O SSM 3.1.3. Intel® Agilex™ EMIF Architecture: I/O Bank 3.1.4. Intel® Agilex™ EMIF Architecture: I/O Lane 3.1.5. Intel® Agilex™ EMIF Architecture: Input DQS Clock Tree 3.1.6. Intel® Agilex™ EMIF Architecture: PHY Clock Tree 3.1.7. Intel® Agilex™ EMIF Architecture: PLL Reference Clock Networks 3.1.8. Intel® Agilex™ EMIF Architecture: Clock Phase Alignment
3.1.4. Intel® Agilex™ EMIF Architecture: I/O Lane x
3.1.4.1. Considerations for Designing DDR4 x72 Interface Together with an AVST x8/x16/x32 Configuration Scheme
3.3. Intel® Agilex™ EMIF Calibration x
3.3.1. Intel® Agilex™ Calibration Stages 3.3.2. Intel® Agilex™ Calibration Stages Descriptions 3.3.3. Intel® Agilex™ Calibration Flowchart 3.3.4. Intel® Agilex™ Calibration Algorithms
3.3.4. Intel® Agilex™ Calibration Algorithms x
3.3.4.1. Calibration Algorithms for DDR4 3.3.4.2. Calibration Algorithms for QDR-IV 3.3.4.3. Guidelines for Debugging Calibration Issues
3.3.4.1. Calibration Algorithms for DDR4 x
3.3.4.1.1. DDR4 Read Calibration 3.3.4.1.2. DDR4 Write Calibration
3.3.4.2. Calibration Algorithms for QDR-IV x
3.3.4.2.1. QDR-IV Read Calibration 3.3.4.2.2. QDR-IV Write Calibration
3.3.4.3. Guidelines for Debugging Calibration Issues x
3.3.4.3.1. Debugging Calibration Failure Using Information from the Calibration report 3.3.4.3.2. Debugging Address and Command Leveling Calibration Failure 3.3.4.3.3. Debugging Address and Command Deskew Failure 3.3.4.3.4. Debugging DQS Enable Failure 3.3.4.3.5. Debugging Read Deskew Calibration Failure 3.3.4.3.6. Debugging VREFIN Calibration Failure 3.3.4.3.7. Debugging LFIFO Calibration Failure 3.3.4.3.8. Debugging Write Leveling Failure 3.3.4.3.9. Debugging Write Deskew Calibration Failure 3.3.4.3.10. Debugging VREFOUT Calibration Failure
3.4. Intel® Agilex™ EMIF Controller x
3.4.1. Hard Memory Controller 3.4.2. Intel® Agilex™ Hard Memory Controller Rate Conversion Feature
3.4.1. Hard Memory Controller x
3.4.1.1. Hard Memory Controller Features 3.4.1.2. Hard Memory Controller Main Control Path 3.4.1.3. Data Buffer Controller
3.6. Intel® Agilex™ EMIF for Hard Processor Subsystem x
3.6.1. Restrictions on I/O Bank Usage for Intel® Agilex™ EMIF IP with HPS
4. Intel® Agilex™ FPGA EMIF IP – End-User Signals x
4.1. Intel® Agilex™ EMIF IP Interface and Signal Descriptions 4.2. Intel® Agilex™ EMIF IP AFI Signals 4.3. Intel® Agilex™ EMIF IP AFI 4.0 Timing Diagrams 4.4. Intel® Agilex™ EMIF IP Memory Mapped Register (MMR) Tables
4.1. Intel® Agilex™ EMIF IP Interface and Signal Descriptions x
4.1.1. Intel Agilex EMIF IP Interfaces for DDR4 4.1.2. Intel Agilex EMIF IP Interfaces for QDR-IV
4.1.1. Intel Agilex EMIF IP Interfaces for DDR4 x
4.1.1.1. local_reset_req for DDR4 4.1.1.2. local_reset_status for DDR4 4.1.1.3. pll_ref_clk for DDR4 4.1.1.4. pll_locked for DDR4 4.1.1.5. ac_parity_err for DDR4 4.1.1.6. oct for DDR4 4.1.1.7. mem for DDR4 4.1.1.8. status for DDR4 4.1.1.9. afi_reset_n for DDR4 4.1.1.10. afi_clk for DDR4 4.1.1.11. afi_half_clk for DDR4 4.1.1.12. afi for DDR4 4.1.1.13. emif_usr_reset_n for DDR4 4.1.1.14. emif_usr_clk for DDR4 4.1.1.15. ctrl_amm for DDR4 4.1.1.16. ctrl_amm_aux for DDR4 4.1.1.17. ctrl_auto_precharge for DDR4 4.1.1.18. ctrl_user_priority for DDR4 4.1.1.19. ctrl_ecc_user_interrupt for DDR4 4.1.1.20. ctrl_ecc_readdataerror for DDR4 4.1.1.21. ctrl_ecc_status for DDR4 4.1.1.22. ctrl_mmr_slave for DDR4 4.1.1.23. hps_emif for DDR4 4.1.1.24. emif_calbus for DDR4 4.1.1.25. emif_calbus_clk for DDR4
4.1.2. Intel Agilex EMIF IP Interfaces for QDR-IV x
4.1.2.1. local_reset_req for QDR-IV 4.1.2.2. local_reset_status for QDR-IV 4.1.2.3. pll_ref_clk for QDR-IV 4.1.2.4. pll_locked for QDR-IV 4.1.2.5. oct for QDR-IV 4.1.2.6. mem for QDR-IV 4.1.2.7. status for QDR-IV 4.1.2.8. afi_reset_n for QDR-IV 4.1.2.9. afi_clk for QDR-IV 4.1.2.10. afi_half_clk for QDR-IV 4.1.2.11. afi for QDR-IV 4.1.2.12. emif_usr_reset_n for QDR-IV 4.1.2.13. emif_usr_clk for QDR-IV 4.1.2.14. ctrl_amm for QDR-IV 4.1.2.15. emif_calbus for QDR-IV 4.1.2.16. emif_calbus_clk for QDR-IV
4.2. Intel® Agilex™ EMIF IP AFI Signals x
4.2.1. AFI Clock and Reset Signals 4.2.2. AFI Address and Command Signals 4.2.3. AFI Write Data Signals 4.2.4. AFI Read Data Signals 4.2.5. AFI Calibration Status Signals 4.2.6. AFI Tracking Management Signals 4.2.7. AFI Shadow Register Management Signals
4.3. Intel® Agilex™ EMIF IP AFI 4.0 Timing Diagrams x
4.3.1. AFI Address and Command Timing Diagrams 4.3.2. AFI Write Sequence Timing Diagrams 4.3.3. AFI Read Sequence Timing Diagrams 4.3.4. AFI Calibration Status Timing Diagram
4.4. Intel® Agilex™ EMIF IP Memory Mapped Register (MMR) Tables x
4.4.1. ctrlcfg0 4.4.2. ctrlcfg1 4.4.3. dramtiming0 4.4.4. sbcfg1 4.4.5. caltiming0 4.4.6. caltiming1 4.4.7. caltiming2 4.4.8. caltiming3 4.4.9. caltiming4 4.4.10. caltiming9 4.4.11. dramaddrw 4.4.12. sideband0 4.4.13. sideband1 4.4.14. sideband4 4.4.15. sideband6 4.4.16. sideband7 4.4.17. sideband9 4.4.18. sideband11 4.4.19. sideband12 4.4.20. sideband13 4.4.21. sideband14 4.4.22. dramsts 4.4.23. niosreserve0 4.4.24. niosreserve1 4.4.25. sideband16 4.4.26. ecc3: ECC Error and Interrupt Configuration 4.4.27. ecc4: Status and Error Information 4.4.28. ecc5: Address of Most Recent SBE/DBE 4.4.29. ecc6: Address of Most Recent Correction Command Dropped 4.4.30. ecc7: Extension for Address of Most Recent SBE/DBE 4.4.31. ecc8: Extension for Address of Most Recent Correction Command Dropped
5. Intel® Agilex™ FPGA EMIF IP – Simulating Memory IP x
5.1. Simulation Options 5.2. Simulation Walkthrough
5.2. Simulation Walkthrough x
5.2.1. Calibration Modes 5.2.2. Simulation Scripts 5.2.3. Functional Simulation with Verilog HDL 5.2.4. Functional Simulation with VHDL 5.2.5. Simulating the Design Example
6. Intel® Agilex™ FPGA EMIF IP – DDR4 Support x
6.1. Intel® Agilex™ FPGA EMIF IP Parameter Descriptions 6.2. Intel® Agilex™ External Memory Interfaces Intel® Calibration IP Parameters 6.3. Register Map IP-XACT Support for Intel® Agilex™ EMIF DDR4 IP 6.4. Intel® Agilex™ FPGA EMIF IP Pin and Resource Planning 6.5. DDR4 Board Design Guidelines
6.1. Intel® Agilex™ FPGA EMIF IP Parameter Descriptions x
6.1.1. Intel Agilex EMIF IP DDR4 Parameters: General 6.1.2. Intel Agilex EMIF IP DDR4 Parameters: Memory 6.1.3. Intel Agilex EMIF IP DDR4 Parameters: Mem I/O 6.1.4. Intel Agilex EMIF IP DDR4 Parameters: FPGA I/O 6.1.5. Intel Agilex EMIF IP DDR4 Parameters: Mem Timing 6.1.6. Intel Agilex EMIF IP DDR4 Parameters: Controller 6.1.7. Intel Agilex EMIF IP DDR4 Parameters: Diagnostics 6.1.8. Intel Agilex EMIF IP DDR4 Parameters: Example Designs
6.4. Intel® Agilex™ FPGA EMIF IP Pin and Resource Planning x
6.4.1. Intel® Agilex™ FPGA EMIF IP Interface Pins 6.4.2. Intel® Agilex™ FPGA EMIF IP Resources 6.4.3. Pin Guidelines for Intel® Agilex™ FPGA EMIF IP
6.4.1. Intel® Agilex™ FPGA EMIF IP Interface Pins x
6.4.1.1. Estimating Pin Requirements 6.4.1.2. DIMM Options 6.4.1.3. Maximum Number of Interfaces
6.4.2. Intel® Agilex™ FPGA EMIF IP Resources x
6.4.2.1. OCT 6.4.2.2. PLL
6.4.3. Pin Guidelines for Intel® Agilex™ FPGA EMIF IP x
6.4.3.1. Intel® Agilex™ FPGA EMIF IP Banks 6.4.3.2. General Guidelines 6.4.3.3. x4 DIMM Implementation 6.4.3.4. Specific Pin Connection Requirements 6.4.3.5. Command and Address Signals 6.4.3.6. Clock Signals 6.4.3.7. Data, Data Strobes, DM/DBI, and Optional ECC Signals
6.5. DDR4 Board Design Guidelines x
6.5.1. Terminations for DDR4 with Intel® Agilex™ Devices 6.5.2. Clamshell Topology 6.5.3. General Layout Routing Guidelines 6.5.4. Reference Stackup 6.5.5. Intel® Agilex™ EMIF-Specific Routing Guidelines for Various DDR4 Topologies 6.5.6. DDR4 Routing Guidelines: Discrete (Component) Topologies 6.5.7. Intel® Agilex™ EMIF Pin Swapping Guidelines
6.5.1. Terminations for DDR4 with Intel® Agilex™ Devices x
6.5.1.1. Dynamic On-Chip Termination (OCT) 6.5.1.2. Dynamic On-Die Termination (ODT) in DDR4 6.5.1.3. Choosing Terminations on Intel® Agilex™ FPGA Devices 6.5.1.4. On-Chip Termination Recommendations for Intel® Agilex™ FPGA Devices
6.5.5. Intel® Agilex™ EMIF-Specific Routing Guidelines for Various DDR4 Topologies x
6.5.5.1. One DIMM per Channel (1DPC) for UDIMM, RDIMM, LRDIMM, and SODIMM DDR4 Topologies 6.5.5.2. Two DIMMs per Channel (2DPC) for UDIMM, RDIMM, and LRDIMM DDR4 Topologies 6.5.5.3. Two DIMMs per Channel (2DPC) for SODIMM Topology 6.5.5.4. Skew Matching Guidelines for DIMM Configurations 6.5.5.5. Power Delivery Recommendations for the Memory / DIMM Side
6.5.6. DDR4 Routing Guidelines: Discrete (Component) Topologies x
6.5.6.1. Single Rank x 8 Discrete (Component) Topology 6.5.6.2. Single Rank x 16 Discrete (Component) Topology 6.5.6.3. ADDR/CMD Reference Voltage/RESET Signal Routing Guidelines for Single Rank x 8 and R Rank x 16 Discrete (Component) Topologies 6.5.6.4. Skew Matching Guidelines for DDR4 Discrete Configurations 6.5.6.5. Power Delivery Recommendations for DDR4 Discrete Configurations
7. Intel® Agilex™ FPGA EMIF IP – QDR-IV Support x
7.1. Intel® Agilex™ FPGA EMIF IP Parameter Descriptions 7.2. Intel® Agilex™ External Memory Interfaces Intel® Calibration IP Parameters 7.3. Intel® Agilex™ FPGA EMIF IP Pin and Resource Planning 7.4. QDR-IV Board Design Guidelines
7.1. Intel® Agilex™ FPGA EMIF IP Parameter Descriptions x
7.1.1. Intel Agilex EMIF IP QDR-IV Parameters: General 7.1.2. Intel Agilex EMIF IP QDR-IV Parameters: Memory 7.1.3. Intel Agilex EMIF IP QDR-IV Parameters: FPGA I/O 7.1.4. Intel Agilex EMIF IP QDR-IV Parameters: Mem Timing 7.1.5. Intel Agilex EMIF IP QDR-IV Parameters: Controller 7.1.6. Intel Agilex EMIF IP QDR-IV Parameters: Diagnostics 7.1.7. Intel Agilex EMIF IP QDR-IV Parameters: Example Designs
7.3. Intel® Agilex™ FPGA EMIF IP Pin and Resource Planning x
7.3.1. Intel® Agilex™ FPGA EMIF IP Interface Pins 7.3.2. Intel® Agilex™ FPGA EMIF IP Resources 7.3.3. Pin Guidelines for Intel® Agilex™ FPGA EMIF IP
7.3.1. Intel® Agilex™ FPGA EMIF IP Interface Pins x
7.3.1.1. Estimating Pin Requirements 7.3.1.2. Maximum Number of Interfaces
7.3.2. Intel® Agilex™ FPGA EMIF IP Resources x
7.3.2.1. OCT 7.3.2.2. PLL
7.3.3. Pin Guidelines for Intel® Agilex™ FPGA EMIF IP x
7.3.3.1. Intel® Agilex™ FPGA EMIF IP Banks 7.3.3.2. General Guidelines 7.3.3.3. QDR IV SRAM Commands and Addresses, AP, and AINV Signals 7.3.3.4. QDR IV SRAM Clock Signals 7.3.3.5. QDR IV SRAM Data, DINV, and QVLD Signals 7.3.3.6. Specific Pin Connection Requirements 7.3.3.7. Resource Sharing Guidelines (Multiple Interfaces)
7.4. QDR-IV Board Design Guidelines x
7.4.1. General Layout Routing Guidelines 7.4.2. Reference Stackup 7.4.3. Routing Guidelines for QDR-IV Topology 7.4.4. Intel® Agilex™ EMIF Design Guideline Summary
7.4.3. Routing Guidelines for QDR-IV Topology x
7.4.3.1. QDR-IV Single Device Memory Topology 7.4.3.2. Skew Matching Guidelines for QDR-IV Configurations 7.4.3.3. Power Delivery Recommendation for QDR-IV Configurations
8. Intel® Agilex™ FPGA EMIF IP – Timing Closure x
8.1. Timing Closure 8.2. Optimizing Timing
8.1. Timing Closure x
8.1.1. Timing Analysis
8.1.1. Timing Analysis x
8.1.1.1. PHY or Core
9. Intel® Agilex™ FPGA EMIF IP – I/O Timing Closure x
9.1. I/O Timing Closure Overview 9.2. Collateral Generated with Your EMIF IP 9.3. SPICE Decks 9.4. File Organization 9.5. Top-level Parameterization File 9.6. IP-Supplied Parameters that You Might Need to Override 9.7. Multi-Rank Topology 9.8. Pin Parasitics 9.9. Mask Evaluation
9.3. SPICE Decks x
9.3.1. Address/Command Simulation Deck 9.3.2. FPGA Write Operation Simulation Deck 9.3.3. FPGA Read Operation Simulation Deck
10. Intel® Agilex™ FPGA EMIF IP – Controller Optimization x
10.1. Interface Standard 10.2. Bank Management Efficiency 10.3. Data Transfer 10.4. Improving Controller Efficiency
10.4. Improving Controller Efficiency x
10.4.1. Auto-Precharge Commands 10.4.2. Additive Latency 10.4.3. Bank Interleaving 10.4.4. Additive Latency and Bank Interleaving 10.4.5. User-Controlled Refresh 10.4.6. Frequency of Operation 10.4.7. Series of Reads or Writes 10.4.8. Data Reordering 10.4.9. Starvation Control 10.4.10. Command Reordering 10.4.11. Bandwidth 10.4.12. Enable Command Priority Control 10.4.13. Controller Pre-pay and Post-pay Refresh (DDR4 Only)
10.4.1. Auto-Precharge Commands x
10.4.1.1. Using Auto-precharge to Achieve Highest Memory Bandwidth for DDR4 Interfaces
11. Intel® Agilex™ FPGA EMIF IP – Debugging x
11.1. Interface Configuration Performance Issues 11.2. Functional Issue Evaluation 11.3. Timing Issue Characteristics 11.4. Verifying Memory IP Using the Signal Tap Logic Analyzer 11.5. Hardware Debugging Guidelines 11.6. Categorizing Hardware Issues 11.7. Debugging with the External Memory Interface Debug Toolkit 11.8. Using the Default Traffic Generator 11.9. Using the Configurable Traffic Generator (TG2) 11.10. EMIF On-Chip Debug Port 11.11. Efficiency Monitor
11.1. Interface Configuration Performance Issues x
11.1.1. Interface Configuration Bottleneck and Efficiency Issues
11.2. Functional Issue Evaluation x
11.2.1. Intel® IP Memory Model 11.2.2. Vendor Memory Model 11.2.3. Transcript Window Messages 11.2.4. Modifying the Example Driver to Replicate the Failure
11.3. Timing Issue Characteristics x
11.3.1. Evaluating FPGA Timing Issues 11.3.2. Evaluating External Memory Interface Timing Issues
11.4. Verifying Memory IP Using the Signal Tap Logic Analyzer x
11.4.1. Signals to Monitor with the Signal Tap Logic Analyzer
11.5. Hardware Debugging Guidelines x
11.5.1. Create a Simplified Design that Demonstrates the Same Issue 11.5.2. Measure Power Distribution Network 11.5.3. Measure Signal Integrity and Setup and Hold Margin 11.5.4. Vary Voltage 11.5.5. Operate at a Lower Speed 11.5.6. Determine Whether the Issue Exists in Previous Versions of Software 11.5.7. Determine Whether the Issue Exists in the Current Version of Software 11.5.8. Try A Different PCB 11.5.9. Try Other Configurations 11.5.10. Debugging Checklist
11.6. Categorizing Hardware Issues x
11.6.1. Signal Integrity Issues 11.6.2. Hardware and Calibration Issues
11.6.1. Signal Integrity Issues x
11.6.1.1. Characteristics of Signal Integrity Issues 11.6.1.2. Evaluating Signal Integrity Issues
11.6.1.2. Evaluating Signal Integrity Issues x
11.6.1.2.1. Skew 11.6.1.2.2. Crosstalk 11.6.1.2.3. Power System 11.6.1.2.4. Clock Signals 11.6.1.2.5. Address and Command Signals 11.6.1.2.6. Read Data Valid Window and Eye Diagram 11.6.1.2.7. Write Data Valid Window and Eye Diagram 11.6.1.2.8. OCT and ODT Usage
11.6.2. Hardware and Calibration Issues x
11.6.2.1. Postamble Timing Issues and Margin 11.6.2.2. Intermittent Issue Evaluation
11.7. Debugging with the External Memory Interface Debug Toolkit x
11.7.1. Prerequisites for Using the EMIF Debug Toolkit 11.7.2. Configuring a Design to Use the Toolkit 11.7.3. Launching the EMIF Debug Toolkit 11.7.4. Using the EMIF Debug Toolkit 11.7.5. Exporting Tables 11.7.6. Viewing Reports Graphically in the Eye Viewer
11.7.2. Configuring a Design to Use the Toolkit x
11.7.2.1. Generating a Design Example with the Debug Toolkit 11.7.2.2. Creating a Design Example with Multiple External Memory Interfaces 11.7.2.3. Enabling the EMIF Toolkit in an Existing Design
11.7.4. Using the EMIF Debug Toolkit x
11.7.4.1. Memory Configuration Tab 11.7.4.2. Calibration Tab 11.7.4.3. Guidelines for Debugging Calibration Issues 11.7.4.4. Calibration Report Tab 11.7.4.5. Calibrate Termination Tab 11.7.4.6. Vref Margining Tab 11.7.4.7. Driver Margining Tab 11.7.4.8. ISSPs Tab 11.7.4.9. Pin Delay Settings Tab
11.7.4.2. Calibration Tab x
11.7.4.2.1. Rerunning Calibration 11.7.4.2.2. Rerunning the Traffic Generator
11.7.4.3. Guidelines for Debugging Calibration Issues x
11.7.4.3.1. Debugging Calibration Failure Using Information from the Calibration report 11.7.4.3.2. Debugging Address and Command Leveling Calibration Failure 11.7.4.3.3. Debugging Address and Command Deskew Failure 11.7.4.3.4. Debugging DQS Enable Failure 11.7.4.3.5. Debugging Read Deskew Calibration Failure 11.7.4.3.6. Debugging VREFIN Calibration Failure 11.7.4.3.7. Debugging LFIFO Calibration Failure 11.7.4.3.8. Debugging Write Leveling Failure 11.7.4.3.9. Debugging Write Deskew Calibration Failure 11.7.4.3.10. Debugging VREFOUT Calibration Failure
11.8. Using the Default Traffic Generator x
11.8.1. Reading the Default Traffic Generator Status 11.8.2. Running Infinite Traffic using the Default Traffic Generator 11.8.3. Changing the Reset Trigger of the Default Traffic Generator 11.8.4. Observing Generated Traffic with Signal Tap
11.9. Using the Configurable Traffic Generator (TG2) x
11.9.1. Enabling the Traffic Generator in a Design Example 11.9.2. Traffic Generator Block Description 11.9.3. Default Traffic Pattern 11.9.4. Configuration and Status Registers 11.9.5. User Pattern 11.9.6. Traffic Generator Status 11.9.7. Starting Traffic with the Traffic Generator 11.9.8. Traffic Generator Configuration User Interface
11.9.5. User Pattern x
11.9.5.1. Test Duration / Instruction pattern 11.9.5.2. Address Pattern 11.9.5.3. Data Pattern and Byte Enable
11.9.5.2. Address Pattern x
11.9.5.2.1. Address Generator Modes 11.9.5.2.2. Address Generator MSB Indices 11.9.5.2.3. Address Generator Effective Width 11.9.5.2.4. Address Generator Relative Frequencies 11.9.5.2.5. Address Pattern Examples - Basic Mode 11.9.5.2.6. Address Pattern Examples - Advanced Mode
11.9.8. Traffic Generator Configuration User Interface x
11.9.8.1. Connecting the Traffic Generator 11.9.8.2. Configuring the Traffic Generator 11.9.8.3. Traffic Generator Preset Selection 11.9.8.4. Traffic Generator Status Report 11.9.8.5. Examples of Configuring the TG2 Traffic Generator
11.10. EMIF On-Chip Debug Port x
11.10.1. Enabling the On-Chip Debug Port 11.10.2. I/O SSM calbus Bridge Data Structures and Usage 11.10.3. I/O SSM User-RAM Data Structures and Usage 11.10.4. Debug Interface Structure 11.10.5. Example: Reading Calibration Results and Margins with the On-Chip Debug Port
11.10.3. I/O SSM User-RAM Data Structures and Usage x
11.10.3.1. Parameter Tables 11.10.3.2. Parameter Table Enums
11.10.3.1. Parameter Tables x
11.10.3.1.1. Global Parameter Table 11.10.3.1.2. Per-interface Parameter Table Structure 11.10.3.1.3. Parameter Table Arrays
11.10.4. Debug Interface Structure x
11.10.4.1. Debug Data Structures 11.10.4.2. Debug Enums
11.11. Efficiency Monitor x
11.11.1. Enabling the Efficiency Monitor in a Design Example 11.11.2. Efficiency Monitor Block Descriptions 11.11.3. Control and Status Registers 11.11.4. Opening the Efficiency Monitor Toolkit
1. About the External Memory Interfaces Intel® Agilex™ FPGA IP
2. Intel® Agilex™ FPGA EMIF IP – Introduction
3. Intel® Agilex™ FPGA EMIF IP – Product Architecture
4. Intel® Agilex™ FPGA EMIF IP – End-User Signals
5. Intel® Agilex™ FPGA EMIF IP – Simulating Memory IP
6. Intel® Agilex™ FPGA EMIF IP – DDR4 Support
7. Intel® Agilex™ FPGA EMIF IP – QDR-IV Support
8. Intel® Agilex™ FPGA EMIF IP – Timing Closure
9. Intel® Agilex™ FPGA EMIF IP – I/O Timing Closure
10. Intel® Agilex™ FPGA EMIF IP – Controller Optimization
11. Intel® Agilex™ FPGA EMIF IP – Debugging
12. External Memory Interfaces Intel® Agilex™ FPGA IP User Guide Archives
13. Document Revision History for External Memory Interfaces Intel® Agilex™ FPGA IP User Guide

6.4.3.7. Data, Data Strobes, DM/DBI, and Optional ECC Signals

DDR4 SDRAM devices use bidirectional differential data strobes. Differential DQS operation enables improved system timing due to reduced crosstalk and less simultaneous switching noise on the strobe output drivers. The DQ pins are also bidirectional.

DQ pins in DDR4 SDRAM interfaces can operate in either ×4 or ×8 mode DQS groups, depending on your chosen memory device or DIMM, regardless of interface width. The ×4 and ×8 configurations use one pair of bidirectional data strobe signals, DQS and DQSn, to capture input data. However, two pairs of data strobes, UDQS and UDQS# (upper byte) and LDQS and LDQS# (lower byte), are required by ×16 configurations. A group of DQ pins must remain associated with its respective DQS and DQSn pins.

The DQ signals are edge-aligned with the DQS signal during a read from the memory and are center-aligned with the DQS signal during a write to the memory. The memory controller shifts the DQ signals by –90 degrees during a write operation to center align the DQ and DQS signals. The PHY IP delays the DQS signal during a read, so that the DQ and DQS signals are center aligned at the capture register. Intel® devices use a phase-locked loop (PLL) to center-align the DQS signal with respect to the DQ signals during writes and use dedicated DQS phase-shift circuitry to shift the incoming DQS signal during reads. The following figure shows an example where the DQS signal is shifted by 90 degrees for a read from the SDRAM.

Figure 89. Edge-aligned DQ and DQS Relationship During a SDRAM Read in Burst-of-Four Mode


The following figure shows an example of the relationship between the data and data strobe during a burst-of-four write.

Figure 90. DQ and DQS Relationship During a SDRAM Write in Burst-of-Four Mode


The memory device's setup (tDS) and hold times (tDH) for the DQ and DM pins during writes are relative to the edges of DQS write signals and not the CK or CK# clock. Setup and hold requirements are not necessarily balanced.

The DQS signal is generated on the positive edge of the system clock to meet the tDQSS requirement. DQ and DM signals use a clock shifted –90 degrees from the system clock, so that the DQS edges are centered on the DQ or DM signals when they arrive at the SDRAM. The DQS, DQ, and DM board trace lengths need to be tightly matched (within 20 ps).

The SDRAM uses the DM pins during a write operation. Driving the DM pins low shows that the write is valid. The memory masks the DQ signals if the DM pins are driven high. To generate the DM signal, Intel® recommends that you use the spare DQ pin within the same DQS group as the respective data, to minimize skew.

The DM signal's timing requirements at the SDRAM input are identical to those for DQ data. The DDR registers, clocked by the –90 degree shifted clock, create the DM signals.

DDR4 supports DM similarly to other SDRAM, except that in DDR4 DM is active LOW and bidirectional, because it supports Data Bus Inversion (DBI) through the same pin. DM is multiplexed with DBI by a Mode Register setting whereby only one function can be enabled at a time. DBI is an input/output identifying whether to store/output the true or inverted data. When enabled, if DBI is LOW, during a write operation the data is inverted and stored inside the DDR4 SDRAM; during a read operation, the data is inverted and output. The data is not inverted if DBI is HIGH. For Intel® Agilex™ interfaces, the DM/DBI pins do not need to be paired with a DQ pin.

Some SDRAM modules support error correction coding (ECC) to allow the controller to detect and automatically correct error in data transmission. The 72-bit SDRAM modules contain eight extra data pins in addition to 64 data pins. The eight extra ECC pins should be connected to a single DQS or DQ group on the FPGA.

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