High Bandwidth Memory (HBM2) Interface Intel® FPGA IP User Guide

ID 683189
Date 1/20/2023
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

4.3. Pin Planning for the High Bandwidth Memory (HBM2) Interface Intel® FPGA IP

The High Bandwidth Memory (HBM2) Interface Intel® FPGA IP requires the following clock inputs:
  • UIB PLL reference clock – Reference clock input for the UIB PLL. There is one UIB PLL reference clock per HBM2 interface.
  • Core clock input – Fabric core clock, generated through an I/O PLL.

When the core clock frequency is one-half of the HBM2 clock frequency, the reference clock that drives the core I/O PLL should come from the same oscillator as that supplying the UIB PLL reference clock on the board for a given HBM2 interface.

Table 17.  Placement Requirements for PLL Reference Input Clocks
Signal Description Pin Placement Guidelines
pll_ref_clk

The HBM2 IP parameter editor allows the selection of the following I/O standards:

  • LVDS with on-chip termination
  • LVDS without on-chip termination

Refer to the Intel® Stratix® 10 General Purpose I/O User Guide and Intel® Stratix® 10 Pin Connection Guidelines for termination recommendations based on the I/O standard chosen for the UIB PLL reference clock.

Place this reference clock input on the UIB_PLL_REF_CLK_00 pins while using the HBM2 device on the bottom of the FPGA, or the UIB_PLL_REF_CLK_01 pins while using the HBM2 on the top of the FPGA.
ext_core_clk LVDS differential input clock for generating the fabric core clock. Instantiate the I/O PLL that generates the core clock for the HBM2 IP. Place the reference clock input on CLK_ pins to access the I/O PLL. You should select pins that are close to the UIB_PLL_REF_CLK input. You must instantiate the I/O PLL in the design flow. The output of the I/O PLL serves as the EXT_CORE_CLK.

Jitter Specifications for the Input Reference Clocks

Both the reference clock inputs should meet and not exceed the following time interval error (TIE) jitter requirements:

  • 20ps peak-to-peak
  • 1.42ps RMS at 1e-12 BER
  • 1.22ps at 1e-16 BER