Memory Interfaces Solution Guide

Issue 1: Overcoming Memory Interface Bottlenecks

Welcome

• Faster, But More Challenging
  Editorial by Adrian Cosoroba, Marketing Manager, Product Solutions Marketing.

Articles

• Implementing High-Performance Memory Interfaces with Virtex-4 FPGAs
  You can center-align clock-to-read data at “run time” with ChipSync™ technology.
• Successful DDR2 Design
  Mentor Graphics highlights design issues and solutions for DDR2, the latest trend in memory design.
• Designing a Spartan-3 FPGA DDR Memory Interface
  Xilinx provides many tools to implement customized DDR memory interfaces.
• Xilinx/Micron Partner to Provide High-Speed Memory Interfaces
  Micron’s RLDRAM II and DDR/DDR2 memory combines performance-critical features to provide both flexibility and simplicity for Virtex-4-supported applications.
• Meeting Signal Integrity Requirements in FPGAs with High-End Memory Interfaces
  As valid signal windows shrink, signal integrity becomes a dominant factor in ensuring that high-end memory interfaces perform flawlessly.
• How to Detect Potential Memory Problems Early in FPGA Designs
  System compatibility testing for FPGA memory requires methods other than traditional signal integrity analysis.
• Interfacing QDR II SRAM with Virtex-4 FPGAs
  QDR II SRAM devices provide a suitable solution for memory requirements when partnered with Virtex-4 FPGAs.

Application Notes

• Memory Interfaces Reference Designs
  Give your designs the Virtex-4 FPGA advantage.
• DDR2 SDRAM Memory Interface for Spartan-3 FPGAs
  This application note describes a DDR2 SDRAM memory interface implementation in a Spartan™-3 device, interfacing with a Micron DDR2 SDRAM device. This document provides a brief overview of the DDR2 SDRAM device features, followed by a detailed explanation of the DDR2 SDRAM memory interface implementation.
• DDR2 Controller (267 MHz and Above) Using Virtex-4 Devices
  DDR2 SDRAM devices offer new features that go beyond the DDR SDRAM specification and enable the DDR2 device to operate at data rates of 666 Mb/s. High data rates require higher performance from the controller and the I/Os in the FPGA. To achieve the desired bandwidth, it is essential for the controller to operate synchronously with the operating speed of the memory.
• High-Performance DDR2 SDRAM Interface Data Capture Using ISERDES and OSERDES
  This application note describes a data capture technique for a high-performance DDR2 SDRAM interface. This technique uses the Input Serializer/Deserializer (ISERDES) and Output Serializer/Deserializer (OSERDES) features available in every Virtex™-4 I/O. This technique can be used for memory interfaces with frequencies of 267 MHz (533 Mb/s) and above.

Education

• Signal Integrity for High-Speed Memory and Processor I/O
  Learn how signal integrity techniques are applicable to high-speed interfaces between Xilinx FPGAs and semiconductor memories. This course teaches you about high-speed bus and clock design, including transmission line termination, loading, and jitter.

Boards

• Virtex-4 Memory Interfaces
  Building interfaces to high-performance memory devices presents challenges such as high-speed synchronous data capturing, along with implementing complex physical-layer interfaces and control logic.