External Memory Interfaces (EMIF) IP User Guide: Agilex™ 3 FPGAs and SoCs

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ID 847458
Date 7/07/2025
Public
Document Table of Contents
Document Table of Contents x
1. About the External Memory Interfaces Agilex™ 3 FPGA IP 2. Agilex™ 3 FPGA EMIF IP – Introduction 3. Agilex™ 3 FPGA EMIF IP - Configuring and Generating the IP 4. Agilex™ 3 FPGA EMIF IP – Simulating Memory IP 5. Agilex™ 3 FPGA EMIF IP - Validating the IP 6. Agilex 3 FPGA EMIF IP Debugging 7. Document Revision History for External Memory Interfaces (EMIF) IP User Guide A. Agilex™ 3 FPGA EMIF IP – Product Architecture B. Agilex™ 3 FPGA EMIF IP – End-User Signals
1. About the External Memory Interfaces Agilex™ 3 FPGA IP x
1.1. Release Information
2. Agilex™ 3 FPGA EMIF IP – Introduction x
2.1. Agilex™ 3 EMIF IP Protocol and Feature Support 2.2. Protocol and Maximum Interface Width Support 2.3. Agilex 3 EMIF IP Design Flow 2.4. Agilex™ 3 EMIF IP Design Checklist
3. Agilex™ 3 FPGA EMIF IP - Configuring and Generating the IP x
3.1. Creating an EMIF Project 3.2. Generating and Configuring the EMIF IP 3.3. Generating HDL for Synthesis and Simulation 3.4. Generating the Synthesizable EMIF Design Example 3.5. EMIF IP LPDDR4 Parameter Descriptions 3.6. Agilex™ 3 FPGA EMIF IP Pin and Resource Planning 3.7. Compiling the Agilex™ 3 EMIF Design Example 3.8. Agilex™ 3 FPGA EMIF IP – Timing Closure 3.9. Agilex™ 3 FPGA EMIF IP – Controller Optimization
3.4. Generating the Synthesizable EMIF Design Example x
3.4.1. Synthesis Design Example
3.5. EMIF IP LPDDR4 Parameter Descriptions x
3.5.1. High-level Configuration Tab 3.5.2. Advanced: Memory Timing Tab 3.5.3. Advanced: Analog Overrides Tab 3.5.4. Example Design Tab 3.5.5. Configuring DQ Pin Swizzling
3.5.5. Configuring DQ Pin Swizzling x
3.5.5.1. Example: DQ Pin Swizzling Within DQS Group for a x32 LPDDR4 Interface 3.5.5.2. Example: Byte Swizzling for x32 LPDDR4 Interface 3.5.5.3. Example: Combining Pin and Byte Swizzling 3.5.5.4. Example: DQ Pin Swizzling Within DQS Group for 2 Channel x16 LPDDR4 Interface 3.5.5.5. Example: Byte Swizzling for 2 Channel x16 LPDDR4 Interface
3.6. Agilex™ 3 FPGA EMIF IP Pin and Resource Planning x
3.6.1. Agilex™ 3 FPGA EMIF IP Interface Pins 3.6.2. Pin Guidelines for Agilex™ 3 FPGA EMIF IP 3.6.3. Agilex™ 3 FPGA EMIF IP Resources
3.6.1. Agilex™ 3 FPGA EMIF IP Interface Pins x
3.6.1.1. Estimating Pin Requirements 3.6.1.2. LPDDR4 Component Options 3.6.1.3. Maximum Number of Interfaces 3.6.1.4. Address and Command Pin Placement for LPDDR4 3.6.1.5. LPDDR4 Data Width Mapping 3.6.1.6. Pin Placement for Agilex™ 3 EMIF IP
3.6.2. Pin Guidelines for Agilex™ 3 FPGA EMIF IP x
3.6.2.1. General Guidelines 3.6.2.2. Specific Pin Connection Requirements 3.6.2.3. Command and Address Signals 3.6.2.4. Clock Signals 3.6.2.5. Pin Swizzling Guidelines
3.6.3. Agilex™ 3 FPGA EMIF IP Resources x
3.6.3.1. OCT 3.6.3.2. PLL
3.8. Agilex™ 3 FPGA EMIF IP – Timing Closure x
3.8.1. Timing Closure 3.8.2. Timing Analysis 3.8.3. PHY or Core 3.8.4. Optimizing Timing
3.9. Agilex™ 3 FPGA EMIF IP – Controller Optimization x
3.9.1. Optimizing Efficiency for Secondary Controller 3.9.2. Interface Standard 3.9.3. Bank Management Efficiency 3.9.4. Data Transfer 3.9.5. Improving Controller Efficiency
3.9.5. Improving Controller Efficiency x
3.9.5.1. Series of Reads or Writes 3.9.5.2. AXI to Memory Mapping 3.9.5.3. Controller Performance Profile
4. Agilex™ 3 FPGA EMIF IP – Simulating Memory IP x
4.1. Simulation Walkthrough 4.2. Generating the EMIF Design Example for Simulation 4.3. Simulation Design Example 4.4. Simulating the Design Example
4.1. Simulation Walkthrough x
4.1.1. Calibration 4.1.2. Simulation Scripts 4.1.3. Functional Simulation with Verilog HDL
5. Agilex™ 3 FPGA EMIF IP - Validating the IP x
5.1. Validating the Design Example with the Test Engine IP 5.2. Checking the EMIF Design Example with the Performance Monitor
6. Agilex 3 FPGA EMIF IP Debugging x
6.1. Interface Configuration Performance Issues 6.2. Functional Issue Evaluation 6.3. Timing Issue Characteristics 6.4. Evaluating FPGA Timing Issues 6.5. Verifying Memory IP Using the Signal Tap Logic Analyzer 6.6. Guidelines for Developing HDL for Traffic Generator 6.7. Debugging with the External Memory Interface Debug Toolkit 6.8. Guidelines for Traffic Generator Status Check 6.9. Hardware Debugging Guidelines 6.10. Categorizing Hardware Issues 6.11. Agilex™ 3 FPGA EMIF IP - Mailbox Support
6.1. Interface Configuration Performance Issues x
6.1.1. Interface Configuration Bottleneck and Efficiency Issues
6.2. Functional Issue Evaluation x
6.2.1. Altera IP Memory Model 6.2.2. Vendor Memory Model 6.2.3. Transcript Window Messages
6.4. Evaluating FPGA Timing Issues x
6.4.1. Evaluating External Memory Interface Timing Issues
6.7. Debugging with the External Memory Interface Debug Toolkit x
6.7.1. Prerequisites for Using the EMIF Debug Toolkit 6.7.2. Configuring a Design to Use the Debug Toolkit 6.7.3. Launching the EMIF Debug Toolkit 6.7.4. Using the EMIF Debug Toolkit
6.7.2. Configuring a Design to Use the Debug Toolkit x
6.7.2.1. Generating a Design Example with the Debug Toolkit
6.7.4. Using the EMIF Debug Toolkit x
6.7.4.1. Running Re-Calibration 6.7.4.2. Running the Test Engine 6.7.4.3. Generating Traffic with the Test Engine IP
6.8. Guidelines for Traffic Generator Status Check x
6.8.1. Status Check Using the Signal Tap Logic Analyzer 6.8.2. Exporting the Status Interface to the Top-Level Design
6.9. Hardware Debugging Guidelines x
6.9.1. Create a Simplified Design that Demonstrates the Same Issue 6.9.2. Measure Power Distribution Network 6.9.3. Measure Signal Integrity and Setup and Hold Margin 6.9.4. Vary Voltage 6.9.5. Operate at a Lower Speed 6.9.6. Determine Whether the Issue Exists in Previous Versions of Software 6.9.7. Determine Whether the Issue Exists in the Current Version of Software 6.9.8. Try A Different PCB 6.9.9. Try Other Configurations 6.9.10. Debugging Checklist
6.10. Categorizing Hardware Issues x
6.10.1. Signal Integrity Issues 6.10.2. Hardware and Calibration Issues
6.10.1. Signal Integrity Issues x
6.10.1.1. Characteristics of Signal Integrity Issues 6.10.1.2. Evaluating Signal Integrity Issues 6.10.1.3. Skew 6.10.1.4. Crosstalk 6.10.1.5. Power System 6.10.1.6. Clock Signals 6.10.1.7. Address and Command Signals 6.10.1.8. Read Data Valid Window and Eye Diagram 6.10.1.9. Write Data Valid Window and Eye Diagram
6.10.2. Hardware and Calibration Issues x
6.10.2.1. Verifying High-Level Configuration 6.10.2.2. Verifying Memory Timing Parameters 6.10.2.3. Verifying the Correct Memory Component Installed 6.10.2.4. Debugging Intermittent Issues
6.11. Agilex™ 3 FPGA EMIF IP - Mailbox Support x
6.11.1. Agilex™ 3 Mailbox Structure and Register Definitions 6.11.2. Accessing Read-Only Registers 6.11.3. Sending a Mailbox Command 6.11.4. IOSSM Mailbox Access Script
6.11.1. Agilex™ 3 Mailbox Structure and Register Definitions x
6.11.1.1. Mailbox Supported Commands 6.11.1.2. Mailbox Command Definitions 6.11.1.3. ECC Syndrome Codes 6.11.1.4. ECC Error Handling
6.11.2. Accessing Read-Only Registers x
6.11.2.1. Example 1: Reading IP_TYPE and IP_INSTANCE_ID of All the Interfaces in the IO96B Through Read-Only Registers 6.11.2.2. Example 2: Reading the Memory Clock Frequency for an Interface
6.11.3. Sending a Mailbox Command x
6.11.3.1. Example 3: Sending Recalibration Request and Reading Calibration Status Using the Mailbox 6.11.3.2. Example 4: Sending ECC_INJECT_ERROR Using the Mailbox and Reading ECC Error Status, ECC Error Buffer Registers
6.11.4. IOSSM Mailbox Access Script x
6.11.4.1. Mailbox Script Overview 6.11.4.2. Running the Mailbox Script
6.11.4.1. Mailbox Script Overview x
6.11.4.1.1. mb_iossm_command.tcl 6.11.4.1.2. mb_user_input.tcl
A. Agilex™ 3 FPGA EMIF IP – Product Architecture x
A.1. Agilex™ 3 EMIF Architecture: Introduction
A.1. Agilex™ 3 EMIF Architecture: Introduction x
A.1.1. Agilex™ 3 EMIF Architecture: I/O Subsystem A.1.2. Agilex™ 3 EMIF Architecture: I/O SSM A.1.3. Agilex™ 3 EMIF Architecture: HSIO Bank A.1.4. Agilex™ 3 EMIF Architecture: I/O Lane A.1.5. Agilex™ 3 EMIF Architecture: Input DQS Clock Tree A.1.6. Agilex™ 3 EMIF Architecture: PHY Clock Tree A.1.7. Agilex™ 3 EMIF Architecture: PLL Reference Clock Networks A.1.8. Agilex™ 3 EMIF Architecture: Clock Phase Alignment A.1.9. User Clock in Different Core Access Modes A.1.10. Agilex™ 3 EMIF Sequencer A.1.11. Agilex™ 3 EMIF Controller A.1.12. Hard Memory Controller A.1.13. Agilex™ 3 EMIF IP for Hard Processor Subsystem (HPS)
A.1.3. Agilex™ 3 EMIF Architecture: HSIO Bank x
A.1.3.1. Narrow Read Transfer Support A.1.3.2. HSIO Sub-Bank Usage
A.1.12. Hard Memory Controller x
A.1.12.1. Hard Memory Controller Features
A.1.13. Agilex™ 3 EMIF IP for Hard Processor Subsystem (HPS) x
A.1.13.1. Restrictions on I/O Bank Usage for Agilex™ 3 EMIF IP with HPS A.1.13.2. Using the Legacy EMIF Debug Toolkit with Agilex™ 3 HPS Interfaces
B. Agilex™ 3 FPGA EMIF IP – End-User Signals x
B.1. IP Interfaces for External Memory Interfaces (EMIF) IP - LPDDR4 B.2. s0_axi4_clock_in for External Memory Interfaces (EMIF) IP - LPDDR4 B.3. core_init_n for External Memory Interfaces (EMIF) IP - LPDDR4 B.4. s0_axi4_clock_in for External Memory Interfaces (EMIF) IP - LPDDR4 B.5. core_init_n for External Memory Interfaces (EMIF) IP - LPDDR4 B.6. s0_axi4_ctrl_ready for External Memory Interfaces (EMIF) IP - LPDDR4 B.7. s0_axi4_clock_out for External Memory Interfaces (EMIF) IP - LPDDR4 B.8. s1_axi4_ctrl_ready for External Memory Interfaces (EMIF) IP - LPDDR4 B.9. s0_axi4 for External Memory Interfaces (EMIF) IP - LPDDR4 B.10. s1_axi4 for External Memory Interfaces (EMIF) IP - LPDDR4 B.11. io96b0_to_hps for External Memory Interfaces (EMIF) IP - LPDDR4 B.12. io96b1_to_hps for External Memory Interfaces (EMIF) IP - LPDDR4 B.13. s0_axi4lite_clock for External Memory Interfaces (EMIF) IP - LPDDR4 B.14. s0_axi4lite_reset_n for External Memory Interfaces (EMIF) IP - LPDDR4 B.15. s0_axi4lite for External Memory Interfaces (EMIF) IP - LPDDR4 B.16. mem_0 for External Memory Interfaces (EMIF) IP - LPDDR4 B.17. mem_ck_0 for External Memory Interfaces (EMIF) IP - LPDDR4 B.18. mem_1 for External Memory Interfaces (EMIF) IP - LPDDR4 B.19. mem_ck_1 for External Memory Interfaces (EMIF) IP - LPDDR4 B.20. mem_reset_n for External Memory Interfaces (EMIF) IP - LPDDR4 B.21. oct_0 for External Memory Interfaces (EMIF) IP - LPDDR4 B.22. oct_1 for External Memory Interfaces (EMIF) IP - LPDDR4 B.23. ref_clk for External Memory Interfaces (EMIF) IP - LPDDR4
1. About the External Memory Interfaces Agilex™ 3 FPGA IP
2. Agilex™ 3 FPGA EMIF IP – Introduction
3. Agilex™ 3 FPGA EMIF IP - Configuring and Generating the IP
4. Agilex™ 3 FPGA EMIF IP – Simulating Memory IP
5. Agilex™ 3 FPGA EMIF IP - Validating the IP
6. Agilex 3 FPGA EMIF IP Debugging
7. Document Revision History for External Memory Interfaces (EMIF) IP User Guide
A. Agilex™ 3 FPGA EMIF IP – Product Architecture
B. Agilex™ 3 FPGA EMIF IP – End-User Signals

3.6.1. Agilex™ 3 FPGA EMIF IP Interface Pins

Agilex™ 3 FPGAs support external memory interfaces in the high speed I/O (HSIO) bank.

The DQS (data strobe), and DQ (data) pins are listed in the device pin tables and are fixed at specific locations in the device. You must adhere to these pin locations to optimize routing, minimize skew, and maximize margins. Always check the pin table for the actual locations of the DQS and DQ pins.

You can estimate whether you have enough pins for your memory interface by performing the following steps:

  1. Determine how many read/write data pins are associated per data strobe or clock pair.
  2. Calculate the number of other memory interface pins needed, including any other clocks (write clock or memory system clock), address, command, and RZQ.
  3. Calculate the total number of I/O banks required to implement the memory interface, given that an I/O bank supports up to 96 pins.

Maximum interface width varies from device to device depending on the number of I/O pins and DQS or DQ groups available. Achievable interface width also depends on the number of address and command pins that the design requires. To ensure adequate PLL, clock, and device routing resources are available, you should always test fit the proposed pin-outs with the rest of your design in the Quartus® Prime software (with the correct I/O standard and OCT connections) before finalizing the pin-outs. Once you completed the design in the Quartus® Prime software, you may proceed to PCB sign-off. There can be interactions between modules that are illegal in the Quartus® Prime software that you might not know about unless you compile the design and use the Quartus® Prime Pin Planner.


Section Content
Estimating Pin Requirements
LPDDR4 Component Options
Maximum Number of Interfaces
Address and Command Pin Placement for LPDDR4
LPDDR4 Data Width Mapping
Pin Placement for Agilex 3 EMIF IP

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