External Memory Interfaces (EMIF) IP User Guide: Agilex™ 5 FPGAs and SoCs

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ID 817467
Date 7/08/2024
Public
Document Table of Contents
Document Table of Contents x
1. About the External Memory Interfaces Agilex™ 5 FPGA IP 2. Agilex™ 5 FPGA EMIF IP – Introduction 3. Agilex™ 5 FPGA EMIF IP – Product Architecture 4. Agilex™ 5 FPGA EMIF IP – End-User Signals 5. Agilex™ 5 FPGA EMIF IP – Simulating Memory IP 6. Agilex™ 5 FPGA EMIF IP - DDR4 Support 7. Agilex™ 5 FPGA EMIF IP - DDR5 Support 8. Agilex™ 5 FPGA EMIF IP - LPDDR4 Support 9. Agilex™ 5 FPGA EMIF IP - LPDDR5 Support 10. Agilex™ 5 FPGA EMIF IP – Timing Closure 11. Agilex™ 5 FPGA EMIF IP – Controller Optimization 12. Agilex™ 5 FPGA EMIF IP – Debugging 13. Document Revision History for External Memory Interfaces (EMIF) IP User Guide
1. About the External Memory Interfaces Agilex™ 5 FPGA IP x
1.1. Release Information
2. Agilex™ 5 FPGA EMIF IP – Introduction x
2.1. Agilex™ 5 EMIF IP Protocol and Feature Support 2.2. Agilex™ 5 EMIF IP Design Flow
2.2. Agilex™ 5 EMIF IP Design Flow x
2.2.1. Agilex™ 5 EMIF IP Design Checklist
3. Agilex™ 5 FPGA EMIF IP – Product Architecture x
3.1. Agilex™ 5 EMIF Architecture: Protocol and Maximum Interface Width Support 3.2. Agilex™ 5 EMIF Architecture: Introduction 3.3. Agilex™ 5 EMIF Sequencer 3.4. Agilex™ 5 EMIF Controller 3.5. Agilex™ 5 EMIF IP for Hard Processor Subsystem (HPS)
3.2. Agilex™ 5 EMIF Architecture: Introduction x
3.2.1. Agilex™ 5 EMIF Architecture: I/O Subsystem 3.2.2. Agilex™ 5 EMIF Architecture: I/O SSM 3.2.3. Agilex™ 5 EMIF Architecture: HSIO Bank 3.2.4. Agilex™ 5 EMIF Architecture: I/O Lane 3.2.5. Agilex™ 5 EMIF Architecture: Input DQS Clock Tree 3.2.6. Agilex™ 5 EMIF Architecture: PHY Clock Tree 3.2.7. Agilex™ 5 EMIF Architecture: PLL Reference Clock Networks 3.2.8. Agilex™ 5 EMIF Architecture: Clock Phase Alignment 3.2.9. User Clock in Different Core Access Modes
3.2.3. Agilex™ 5 EMIF Architecture: HSIO Bank x
3.2.3.1. Lockstep Configuration Two Controllers in Lockstep Within One IO96 Bank Two/Three Controllers in Lockstep Within One IO96 Bank 3.2.3.2. Pin Placement 3.2.3.3. HSIO Sub-Bank Usage
3.3. Agilex™ 5 EMIF Sequencer x
3.3.1. Agilex™ 5 Mailbox Structure and Register Definitions
3.3.1. Agilex™ 5 Mailbox Structure and Register Definitions x
3.3.1.1. Mailbox Supported Commands 3.3.1.2. Mailbox Command Definitions
3.4. Agilex™ 5 EMIF Controller x
3.4.1. Hard Memory Controller
3.4.1. Hard Memory Controller x
3.4.1.1. Hard Memory Controller Features
4. Agilex™ 5 FPGA EMIF IP – End-User Signals x
4.1. Agilex 5 EMIF IP Interfaces for DDR4 4.2. Agilex 5 EMIF IP Interfaces for DDR5 4.3. Agilex 5 EMIF IP Interfaces for LPDDR4 4.4. Agilex 5 EMIF IP Interfaces for LPDDR5 4.5. Agilex 5 EMIF IP Interfaces for the EMIF Calibration Component
4.1. Agilex 5 EMIF IP Interfaces for DDR4 x
4.1.1. ref_clk for EMIF IP 4.1.2. core_init_n for EMIF IP 4.1.3. usr_async_clk for EMIF IP 4.1.4. usr_clk for EMIF IP 4.1.5. usr_rst_n for EMIF IP 4.1.6. s0_axi4 for EMIF IP 4.1.7. mem for EMIF IP 4.1.8. oct for EMIF IP
4.2. Agilex 5 EMIF IP Interfaces for DDR5 x
4.2.1. ref_clk for EMIF IP 4.2.2. core_init_n for EMIF IP 4.2.3. usr_async_clk for EMIF IP 4.2.4. usr_clk for EMIF IP 4.2.5. usr_rst_n for EMIF IP 4.2.6. s0_axi4 for EMIF IP 4.2.7. mem for EMIF IP 4.2.8. i3c for EMIF IP 4.2.9. mem_lbd for EMIF IP 4.2.10. mem_lbs for EMIF IP 4.2.11. oct for EMIF IP
4.3. Agilex 5 EMIF IP Interfaces for LPDDR4 x
4.3.1. ref_clk for EMIF IP 4.3.2. core_init_n for EMIF IP 4.3.3. usr_async_clk for EMIF IP 4.3.4. usr_clk for EMIF IP 4.3.5. usr_rst_n for EMIF IP 4.3.6. s0_axi4 for EMIF IP 4.3.7. mem for EMIF IP 4.3.8. oct for EMIF IP
4.4. Agilex 5 EMIF IP Interfaces for LPDDR5 x
4.4.1. ref_clk for EMIF IP 4.4.2. core_init_n for EMIF IP 4.4.3. usr_async_clk for EMIF IP 4.4.4. usr_clk for EMIF IP 4.4.5. usr_rst_n for EMIF IP 4.4.6. s0_axi4 for EMIF IP 4.4.7. mem for EMIF IP 4.4.8. oct for EMIF IP
4.5. Agilex 5 EMIF IP Interfaces for the EMIF Calibration Component x
4.5.1. s0_axi4lite_clk for EMIF IP Calibration Component 4.5.2. s0_axi4lite_rst_n for EMIF IP Calibration Component 4.5.3. s0_axil for EMIF IP Calibration Component
5. Agilex™ 5 FPGA EMIF IP – Simulating Memory IP x
5.1. Simulation Walkthrough
5.1. Simulation Walkthrough x
5.1.1. Calibration 5.1.2. Simulation Scripts 5.1.3. Functional Simulation with Verilog HDL 5.1.4. Simulating the Design Example
6. Agilex™ 5 FPGA EMIF IP - DDR4 Support x
6.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for DDR4 6.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning 6.3. Agilex™ 5 EMIF Pin Swapping Guidelines 6.4. DDR4 Layout Design Guidelines
6.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for DDR4 x
6.1.1. Agilex 5 FPGA External Memory Interfaces (EMIF) IP Parameter Descriptions for DDR4 6.1.2. Agilex 5 FPGA EMIF Memory Device Description IP (DDR4) Parameter Descriptions 6.1.3. Agilex 5 FPGA EMIF Calibration IP Parameter Descriptions
6.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning x
6.2.1. Agilex™ 5 FPGA EMIF IP Resources 6.2.2. Pin Guidelines for Agilex™ 5 FPGA EMIF IP 6.2.3. Pin Placements for Agilex™ 5 FPGA DDR4 EMIF IP
6.2.1. Agilex™ 5 FPGA EMIF IP Resources x
6.2.1.1. OCT 6.2.1.2. PLL
6.2.2. Pin Guidelines for Agilex™ 5 FPGA EMIF IP x
6.2.2.1. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning
6.2.2.1. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning x
6.2.2.1.1. Agilex™ 5 FPGA EMIF IP Interface Pins 6.2.2.1.2. Estimating Pin Requirements 6.2.2.1.3. Maximum Number of Interfaces
6.2.3. Pin Placements for Agilex™ 5 FPGA DDR4 EMIF IP x
6.2.3.1. Address and Command Pin Placement for DDR4 6.2.3.2. DDR4 Data Width Mapping 6.2.3.3. General Guidelines 6.2.3.4. x4 DIMM Implementation 6.2.3.5. Specific Pin Connection Requirements 6.2.3.6. Command and Address Signals 6.2.3.7. Clock Signals 6.2.3.8. Data, Data Strobes, DM/DBI, and Optional ECC Signals
6.3. Agilex™ 5 EMIF Pin Swapping Guidelines x
6.3.1. DDR4 Byte Lane Swapping 6.3.2. DDR4 Address and Command and CLK Lane 6.3.3. DDR4 Interface x8 Data Lane 6.3.4. DDR4 Interface x4 Data Lane
6.4. DDR4 Layout Design Guidelines x
6.4.1. DDR4 PCB Stackup and Design Considerations 6.4.2. DDR4 General Design Considerations 6.4.3. DDR4 Routing Guidelines - Memory-Down (Discrete) Topologies
6.4.3. DDR4 Routing Guidelines - Memory-Down (Discrete) Topologies x
6.4.3.1. 1 Rank x 8 Discrete (Memory Down) Topology 6.4.3.2. 1 Rank x 16 Discrete (Memory Down) Topology 6.4.3.3. VREF_CA/RESET Signal Routing Guidelines for 1 Rank x 8 and 1 Rank x 16 Discrete (Memory Down) Topology 6.4.3.4. Skew Matching Guidelines for DDR4 (Memory Down) Discrete Configurations 6.4.3.5. Power Delivery Recommendation for DDR4 Discrete Configurations 6.4.3.6. DDR4 Simulation Strategy
7. Agilex™ 5 FPGA EMIF IP - DDR5 Support x
7.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for DDR5 7.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning
7.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for DDR5 x
7.1.1. Agilex 5 FPGA External Memory Interfaces (EMIF) IP Parameter Descriptions for DDR5 7.1.2. Agilex 5 FPGA EMIF Memory Device Description IP (DDR5) Parameter Descriptions 7.1.3. Agilex 5 FPGA EMIF Calibration IP Parameter Descriptions
7.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning x
7.2.1. Agilex™ 5 FPGA EMIF IP Interface Pins 7.2.2. Agilex™ 5 FPGA EMIF IP Resources 7.2.3. Pin Guidelines for Agilex™ 5 FPGA EMIF IP 7.2.4. Pin Placements for Agilex™ 5 FPGA DDR5 EMIF IP 7.2.5. Agilex™ 5 EMIF Pin Swapping Guidelines
7.2.1. Agilex™ 5 FPGA EMIF IP Interface Pins x
7.2.1.1. Estimating Pin Requirements 7.2.1.2. DIMM Options 7.2.1.3. Maximum Number of Interfaces
7.2.2. Agilex™ 5 FPGA EMIF IP Resources x
7.2.2.1. OCT 7.2.2.2. PLL
7.2.3. Pin Guidelines for Agilex™ 5 FPGA EMIF IP x
7.2.3.1. General Guidelines - DDR5 7.2.3.2. x4 DIMM Implementation 7.2.3.3. Specific Pin Connection Requirements 7.2.3.4. Command and Address Signals 7.2.3.5. Clock Signals 7.2.3.6. Data, Data Strobes, DM, and Optional ECC Signals
7.2.4. Pin Placements for Agilex™ 5 FPGA DDR5 EMIF IP x
7.2.4.1. Address and Command Pin Placement for DDR5 7.2.4.2. DDR5 Data Width Mapping
7.2.5. Agilex™ 5 EMIF Pin Swapping Guidelines x
7.2.5.1. DDR5 Byte Lane Swapping 7.2.5.2. DDR5 Address and Command and CLK Lane 7.2.5.3. DDR5 Interface x8 Data Lane 7.2.5.4. DDR5 Interface x4 Data Lane 7.2.5.5. Pin Swizzling
8. Agilex™ 5 FPGA EMIF IP - LPDDR4 Support x
8.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for LPDDR4 8.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning 8.3. LPDDR4 Layout Design Guidelines
8.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for LPDDR4 x
8.1.1. Agilex 5 FPGA External Memory Interfaces (EMIF) IP Parameter Descriptions for LPDDR4 8.1.2. Agilex 5 FPGA EMIF Memory Device Description IP (LPDDR4) Parameter Descriptions 8.1.3. Agilex 5 FPGA EMIF Calibration IP Parameter Descriptions
8.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning x
8.2.1. Agilex™ 5 FPGA EMIF IP Interface Pins 8.2.2. Agilex™ 5 FPGA EMIF IP Resources 8.2.3. Pin Guidelines for Agilex™ 5 FPGA EMIF IP
8.2.1. Agilex™ 5 FPGA EMIF IP Interface Pins x
8.2.1.1. Estimating Pin Requirements 8.2.1.2. LPDDR4 Component Options 8.2.1.3. Maximum Number of Interfaces
8.2.2. Agilex™ 5 FPGA EMIF IP Resources x
8.2.2.1. OCT 8.2.2.2. PLL
8.2.3. Pin Guidelines for Agilex™ 5 FPGA EMIF IP x
8.2.3.1. General Guidelines 8.2.3.2. Specific Pin Connection Requirements 8.2.3.3. Command and Address Signals 8.2.3.4. Clock Signals 8.2.3.5. Address and Command Pin Placement for LPDDR4 8.2.3.6. LPDDR4 Data Width Mapping 8.2.3.7. Pin Swapping Guidelines
8.3. LPDDR4 Layout Design Guidelines x
8.3.1. LPDDR4 PCB Stackup and Design Considerations 8.3.2. LPDDR4 General Design Considerations 8.3.3. LPDDR4 Interface Design Guidelines
8.3.3. LPDDR4 Interface Design Guidelines x
8.3.3.1. LPDDR4 Discrete Component/Memory Down Topology (up to 32 bits interface) 8.3.3.2. LPDDR4 Simulation Strategy
9. Agilex™ 5 FPGA EMIF IP - LPDDR5 Support x
9.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for LPDDR5 9.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning 9.3. LPDDR5 Layout Design Guidelines
9.1. Agilex 5 FPGA EMIF IP Parameter Descriptions for LPDDR5 x
9.1.1. Agilex 5 FPGA External Memory Interfaces (EMIF) IP Parameter Descriptions for LPDDR5 9.1.2. Agilex 5 FPGA EMIF Memory Device Description IP (LPDDR5) Parameter Descriptions 9.1.3. Agilex 5 FPGA EMIF Calibration IP Parameter Descriptions
9.2. Agilex™ 5 FPGA EMIF IP Pin and Resource Planning x
9.2.1. Agilex™ 5 FPGA EMIF IP Interface Pins 9.2.2. Agilex™ 5 FPGA EMIF IP Resources 9.2.3. Pin Guidelines for Agilex™ 5 FPGA EMIF IP 9.2.4. Pin Placements for Agilex™ 5 FPGA LPDDR5 EMIF IP
9.2.1. Agilex™ 5 FPGA EMIF IP Interface Pins x
9.2.1.1. Estimating Pin Requirements 9.2.1.2. LPDDR5 Component Options 9.2.1.3. Maximum Number of Interfaces
9.2.2. Agilex™ 5 FPGA EMIF IP Resources x
9.2.2.1. OCT 9.2.2.2. PLL
9.2.3. Pin Guidelines for Agilex™ 5 FPGA EMIF IP x
9.2.3.1. General Guidelines - LPDDR5 9.2.3.2. Specific Pin Connection Requirements 9.2.3.3. Command and Address Signals 9.2.3.4. Clock Signals
9.2.4. Pin Placements for Agilex™ 5 FPGA LPDDR5 EMIF IP x
9.2.4.1. Address and Command Pin Placement for LPDDR5 9.2.4.2. LPDDR5 Data Width Mapping 9.2.4.3. LPDDR5 Byte Lane Swapping
9.3. LPDDR5 Layout Design Guidelines x
9.3.1. LPDDR5 PCB Stackup and Design Considerations 9.3.2. LPDDR5 General Design Considerations 9.3.3. LPDDR5 Interface Design Guidelines
9.3.3. LPDDR5 Interface Design Guidelines x
9.3.3.1. LPDDR5 Discrete Component/Memory Down Topology (Single Rank or Dual-Rank) 9.3.3.2. Example of an LPDDR5 Layout on an Intel FPGA Platform Board 9.3.3.3. LPDDR5 Simulation Strategy
10. Agilex™ 5 FPGA EMIF IP – Timing Closure x
10.1. Timing Closure 10.2. Optimizing Timing
10.1. Timing Closure x
10.1.1. Timing Analysis
10.1.1. Timing Analysis x
10.1.1.1. PHY or Core
11. Agilex™ 5 FPGA EMIF IP – Controller Optimization x
11.1. Interface Standard 11.2. Bank Management Efficiency 11.3. Data Transfer 11.4. Improving Controller Efficiency
11.4. Improving Controller Efficiency x
11.4.1. Frequency of Operation 11.4.2. Series of Reads or Writes
12. Agilex™ 5 FPGA EMIF IP – Debugging x
12.1. Interface Configuration Performance Issues 12.2. Functional Issue Evaluation 12.3. Timing Issue Characteristics 12.4. Verifying Memory IP Using the Signal Tap Logic Analyzer 12.5. Debugging with the External Memory Interface Debug Toolkit 12.6. Generating Traffic with the Test Engine IP 12.7. Guidelines for Developing HDL for Traffic Generator 12.8. Guidelines for Traffic Generator Status Check 12.9. Hardware Debugging Guidelines 12.10. Create a Simplified Design that Demonstrates the Same Issue 12.11. Measure Power Distribution Network 12.12. Measure Signal Integrity and Setup and Hold Margin 12.13. Vary Voltage 12.14. Operate at a Lower Speed 12.15. Determine Whether the Issue Exists in Previous Versions of Software 12.16. Determine Whether the Issue Exists in the Current Version of Software 12.17. Try A Different PCB 12.18. Try Other Configurations 12.19. Debugging Checklist 12.20. Categorizing Hardware Issues 12.21. Signal Integrity Issues 12.22. Characteristics of Signal Integrity Issues 12.23. Evaluating Signal Integrity Issues 12.24. Skew 12.25. Crosstalk 12.26. Power System 12.27. Clock Signals 12.28. Address and Command Signals 12.29. Read Data Valid Window and Eye Diagram 12.30. Write Data Valid Window and Eye Diagram 12.31. Hardware and Calibration Issues 12.32. Memory Timing Parameter Evaluation 12.33. Verify that the Board Has the Correct Memory Component or DIMM Installed
12.1. Interface Configuration Performance Issues x
12.1.1. Interface Configuration Bottleneck and Efficiency Issues
12.2. Functional Issue Evaluation x
12.2.1. Altera IP Memory Model 12.2.2. Vendor Memory Model 12.2.3. Transcript Window Messages
12.3. Timing Issue Characteristics x
12.3.1. Evaluating FPGA Timing Issues 12.3.2. Evaluating External Memory Interface Timing Issues
12.5. Debugging with the External Memory Interface Debug Toolkit x
12.5.1. Prerequisites for Using the EMIF Debug Toolkit 12.5.2. Configuring a Design to Use the Debug Toolkit 12.5.3. Launching the EMIF Debug Toolkit 12.5.4. Using the EMIF Debug Toolkit
12.5.2. Configuring a Design to Use the Debug Toolkit x
12.5.2.1. Generating a Design Example with the Debug Toolkit
12.5.4. Using the EMIF Debug Toolkit x
12.5.4.1. Running Re-Calibration 12.5.4.2. Running the Test Engine
12.8. Guidelines for Traffic Generator Status Check x
12.8.1. Status Check Using the Signal Tap Logic Analyzer 12.8.2. Exporting the Status Interface to the Top-Level Design
1. About the External Memory Interfaces Agilex™ 5 FPGA IP
2. Agilex™ 5 FPGA EMIF IP – Introduction
3. Agilex™ 5 FPGA EMIF IP – Product Architecture
4. Agilex™ 5 FPGA EMIF IP – End-User Signals
5. Agilex™ 5 FPGA EMIF IP – Simulating Memory IP
6. Agilex™ 5 FPGA EMIF IP - DDR4 Support
7. Agilex™ 5 FPGA EMIF IP - DDR5 Support
8. Agilex™ 5 FPGA EMIF IP - LPDDR4 Support
9. Agilex™ 5 FPGA EMIF IP - LPDDR5 Support
10. Agilex™ 5 FPGA EMIF IP – Timing Closure
11. Agilex™ 5 FPGA EMIF IP – Controller Optimization
12. Agilex™ 5 FPGA EMIF IP – Debugging
13. Document Revision History for External Memory Interfaces (EMIF) IP User Guide

3.2.3.1. Lockstep Configuration

To support user data widths greater than 32 bits in DDR4 on Agilex™ 5 D-Series devices, the external memory interface (EMIF) IP instantiates multiple memory controllers driven in lockstep.

The primary controller drives the address and command bus and 32-bits of the DQ bus, while the other controllers drive the remainder of the DQ bus.

The following table summarizes the supported lockstep configurations:

Table 6.  Supported Lockstep Controller Configurations
Memory Protocol Configuration DQ Width AXI Interface
DDR4 x40 40 256 b + 64 b USER DATA
DDR4 x64 64 512 b
DDR4 x64 with ECC 1 72 512 b
DDR4 x72 72 512 b + 64 b USER DATA

To ensure that the controllers remain coordinated in lockstep, the following points apply:

  • Lockstep configurations support only synchronous fabric clocking mode.
  • Some of the controller scheduling and optimization features are disabled.
  • There are limitations on the types of AXI transactions supported. Refer to the following table for details.
    Table 7.  Limitations for Lockstep Configuration in ES Devices
    Memory Protocol Configuration Limitation
    DDR4 x72 Supports AXI transfer size= 6 only.
    DDR4 x64 AXI transfer size min = 1* (2 bytes).
    DDR4 x64 Supports 2-byte aligned transfers only.
    DDR4 x40 Supports AXI transfer size= 5 only.
    DDR4 x40 Support 32-bit aligned transfers only.

Two Controllers in Lockstep Within One IO96 Bank

The EMIF IP instantiates 2 controllers within one IO96 bank to support x40 configurations. The AXI bus is configured as 256-bits wide plus 64-bits of user data (WUSER/RUSER), to generate the required 320-bits of data to transfer a burst-of-8 of 40-bit DQ. The following table illustrates how the AXI WDATA/RDATA and WUSER/RUSER can be mapped to the DQ lanes.

Table 8.  Mapping of WDATA/RDATA & WUSER/RUSER in x40 Configuration
Transfer 0 1 2 3 4 5 6 7
WDATA/RDATA 31:0 63:32 95:64 127:96 159:128 191:160 223:192 255:224
DQ [31:0]
WUSER/RUSER 7:0 15:8 23:16 31:24 39:32 47:40 55:48 63:56
DQ [39:32]

This configuration can support only 3 address/command lane configurations, because there are only 8 byte lanes in one IO96 bank. The WUSER/RUSER signal is mapped to byte lane 7 (DQ lane with prefix s) in x40 configuration.

Table 9.  Supported Byte Lane Placement for x40 configuration
Scheme BL0 BL1 BL2 BL3 BL4 BL5 BL6 BL7
DDR4_AC_TOP DQ[4] DQ[3] DQ[2] DQ[1] AC1 AC2 AC0 sDQ[0]
DDR4_AC_BOT DQ[0] AC0 AC1 AC2 DQ[1] DQ[2] DQ[3] sDQ[4]

Two/Three Controllers in Lockstep Within One IO96 Bank

This configuration is supported only in DDR4. The EMIF IP instantiates two or three controllers across two adjacent IO96 banks for the configurations listed in the table below.

Table 10.  Supported 2/3 Controller Configurations in Lockstep
Configuration DQ Width AXI Interface Notes
x64 64 512b 2 controllers used.
x64 with ECC 72 512b 3 controllers used. ECC will be generated and checked by a soft IP block within the EMIF IP.
x72 72 512b + 64b USER DATA 3 controllers used.

For the x72 configuration, the AXI bus is configured as 512-bits wide, plus 64-bits of user data (WUSER/RUSER). The following example illustrates how you can map the AXI WDATA/RDATA and WUSER/RUSER to the DQ lanes. In this illustration, the WUSER/RUSER is mapped to the byte lane used for DQ [71:64].

The actual DQ lane to which the WUSER/RUSER is mapped depends on the address and command placement used. In each supported address and command placement scheme, the WUSER/RUSER is mapped to the DQ lane that has a prefix s (for example, sDQ0, sDQ4 or sDQ8). Refer to the following tables in the DDR4 Data Width Mapping topic, to identify the actual DQ lane used for WUSER/RUSER:

  • Supported Lockstep configuration for DDR4 x64
  • Supported Lockstep configuration for DDR4 x72 or x64 (with ECC)
Table 11.  Example Mapping of WDATA/RDATA & WUSER/RUSER in x72 Configuration
Transfer 0 1 2 3 4 5 6 7
WDATA/RDATA 63:0 127:64 191:128 255:192 319:256 383:320 447:384 511:448
DQ [63:0]
WUSER/RUSER 7:0 15:8 23:16 31:24 39:32 47:40 55:48 63:56
DQ [71:64]

The generated IP has 2 mem DQ ports, collectively labeled as mem_DQ0 and mem_DQ1. The mapping below shows how these 2 ports are grouped into one single wide DQ port:

Figure 4. 
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