High Bandwidth Memory (HBM2E) Interface Agilex™ 7 M-Series FPGA IP User Guide

Download PDF
ID 773264
Date 11/04/2024
Public
Document Table of Contents
Document Table of Contents x
1. About the High Bandwidth Memory (HBM2E) Interface Agilex™ 7 FPGA IP User Guide 2. Introduction to High Bandwidth Memory 3. Agilex™ 7 M-Series HBM2E Architecture 4. Creating and Parameterizing the High Bandwidth Memory (HBM2E) Interface FPGA IP 5. High Bandwidth Memory (HBM2E) Interface FPGA IP Interface 6. High Bandwidth Memory (HBM2E) Interface FPGA IP Performance 7. Debugging the High Bandwidth Memory (HBM2E) Interface FPGA IP 8. Document Revision History for High Bandwidth Memory (HBM2E) Interface FPGA IP User Guide A. High Bandwidth Memory (HBM2E) Interface FPGA IP Quartus® Prime Software Flow
1. About the High Bandwidth Memory (HBM2E) Interface Agilex™ 7 FPGA IP User Guide x
1.1. Release Information
2. Introduction to High Bandwidth Memory x
2.1. HBM2E in Agilex™ 7 M-Series Devices 2.2. HBM2E DRAM Structure 2.3. Agilex™ 7 HBM2E Features 2.4. Agilex™ 7 M-Series HBM2E Controller Features 2.5. Agilex™ 7 M-Series FPGA HBM2E IP Device Family Support
3. Agilex™ 7 M-Series HBM2E Architecture x
3.1. Agilex™ 7 M-Series HBM2E Introduction 3.2. Agilex™ 7 M-Series Hard Memory NoC Subsystem 3.3. Address Mapping of the HBM2E Targets 3.4. Agilex™ 7 M-Series UIB Architecture 3.5. Agilex™ 7 M-Series HBM2E Controller Architecture
3.5. Agilex™ 7 M-Series HBM2E Controller Architecture x
3.5.1. Agilex™ 7 M-Series HBM2E Controller Details
4. Creating and Parameterizing the High Bandwidth Memory (HBM2E) Interface FPGA IP x
4.1. Creating an Quartus® Prime Pro Edition Project for High Bandwidth Memory (HBM2E) Interface FPGA IP 4.2. Parameterizing the High Bandwidth Memory (HBM2E) Interface FPGA IP
4.2. Parameterizing the High Bandwidth Memory (HBM2E) Interface FPGA IP x
4.2.1. General Parameters for High Bandwidth Memory (HBM2E) Interface FPGA IP 4.2.2. Example Design Parameters for High Bandwidth Memory (HBM2E) Interface FPGA IP 4.2.3. Modifying Your Pin Assignments to Choose the Physical Location of the HBM2E Device
5. High Bandwidth Memory (HBM2E) Interface FPGA IP Interface x
5.1. High Bandwidth Memory (HBM2E) Interface FPGA IP High Level Block Diagram 5.2. High Bandwidth Memory (HBM2E) Interface FPGA IP Controller Interface Signals 5.3. User AXI Interface Timing 5.4. Platform Designer-Only Interface 5.5. User Accesses to the HBM2E Controller
5.2. High Bandwidth Memory (HBM2E) Interface FPGA IP Controller Interface Signals x
5.2.1. Reset, Clock, and Calibration Status Signals 5.2.2. Requirement and Timing of the hbm_reset_n Signal 5.2.3. 'Do not connect' Signals 5.2.4. Asynchronous HBM2E Controller Signals 5.2.5. AXI4 Interface Signals 5.2.6. AXI4-Lite Interface
5.3. User AXI Interface Timing x
5.3.1. AXI Write Transaction 5.3.2. AXI Read Transaction
5.5. User Accesses to the HBM2E Controller x
5.5.1. Initialization Control Register and Initialization Status Register 5.5.2. Thermal Status Register 5.5.3. ECC Error Counters Register 5.5.4. Error Login Registers 5.5.5. Error Injection Registers
6. High Bandwidth Memory (HBM2E) Interface FPGA IP Performance x
6.1. High Bandwidth Memory (HBM2E) Interface FPGA IP Controller Performance 6.2. High Bandwidth Memory (HBM2E) Interface FPGA IP System Performance
6.1. High Bandwidth Memory (HBM2E) Interface FPGA IP Controller Performance x
6.1.1. High Bandwidth Memory (HBM2E) DRAM Bandwidth 6.1.2. High Bandwidth Memory (HBM2E) Interface FPGA IP Efficiency Factors Affecting Controller Efficiency 6.1.3. High Bandwidth Memory (HBM2E) Interface FPGA IP Latency 6.1.4. High Bandwidth Memory (HBM2E) Interface FPGA IP Timing
7. Debugging the High Bandwidth Memory (HBM2E) Interface FPGA IP x
7.1. Debugging Guidelines for High Bandwidth Memory (HBM2E) Interface FPGA IP
A. High Bandwidth Memory (HBM2E) Interface FPGA IP Quartus® Prime Software Flow x
A.1. Initiators Placement Recommendations A.2. Simulating HBM2E User Designs
1. About the High Bandwidth Memory (HBM2E) Interface Agilex™ 7 FPGA IP User Guide
2. Introduction to High Bandwidth Memory
3. Agilex™ 7 M-Series HBM2E Architecture
4. Creating and Parameterizing the High Bandwidth Memory (HBM2E) Interface FPGA IP
5. High Bandwidth Memory (HBM2E) Interface FPGA IP Interface
6. High Bandwidth Memory (HBM2E) Interface FPGA IP Performance
7. Debugging the High Bandwidth Memory (HBM2E) Interface FPGA IP
8. Document Revision History for High Bandwidth Memory (HBM2E) Interface FPGA IP User Guide
A. High Bandwidth Memory (HBM2E) Interface FPGA IP Quartus® Prime Software Flow

6.1.2. High Bandwidth Memory (HBM2E) Interface FPGA IP Efficiency

The HBM2E controller provides high efficiency for any given address pattern from the user interface. The controller efficiently schedules incoming commands, avoiding frequent precharge and activate commands as well as frequent bus turn-around when possible.

Factors Affecting Controller Efficiency

Several factors can affect controller efficiency. For best efficiency, you should consider these factors in your design:

  • User-interface frequency vs HBM2E interface frequency - The frequency of user logic in the FPGA fabric plays an important role in determining HBM2E memory efficiency.
  • Controller Settings - The pseudo-BL8 mode helps to ensure shorter memory access timing between successive BL4 transactions, to improve controller efficiency. Also, BL4 transactions of AXI burst length 1 do not make efficient use of hard memory NoC bandwidth.
  • Traffic Patterns - Traffic patterns play an important role in determining controller efficiency.
    • Sequential vs random DRAM addresses: Sequential addresses enable the controller to issue consecutive write requests to an open page and help to achieve high controller efficiency. Random addresses require constant PRECHARGE/ACTIVATE commands and can reduce controller efficiency.
    • Set the User Auto Precharge Policy to FORCED and set the awuser[0]/aruser[0] signal on the AXI interface to HIGH to enable Auto Precharge for random transactions. For sequential transactions, set the Auto Precharge Policy to HINT.
    • Sequential Read only or Write Only transactions: Sequential read-only or write-only transactions see higher efficiency as they avoid bus turnaround times of the DRAM bi-directional data bus.
  • AXI Transaction IDs – Use of different AXI transaction IDs helps the HBM2E controller schedule the transactions for high efficiency. Use of the same AXI transaction ID preserves command order and may result in lower efficiency.
  • Temperature – There are two main temperature effects that reduce the bandwidth available for data transfers in the Agilex™ 7 HBM2E interface:
    • The HBM2E is exceeding a temperature threshold set in the General > Enable interface throttling based on temperature parameter.
    • Above 85°C, refreshes occur more frequently, so there is less bandwidth available for data transfers.
    The TEMP register value can be read back via the HBM2E controller's AXI4-Lite NoC target interface to help with the correlation of memory refreshes, temperature, and data bandwidth.
Level Two Title