External Memory - SRAM

SRAM

QDR II/QDR II+ / QDR II+Xtreme / QDR IV SRAM devices enable you to maximize memory bandwidth with separate read and write ports. The QDR SRAM architecture features two data ports operating twice per clock cycle to deliver a total of four data words per cycle. The resulting performance increase is particularly valuable in bandwidth-intensive applications.

Intel offers a complete PHY and controller solution for building a QDR II/QDR II+/QDR II+Xtreme/QDR IV SRAM interface in Intel® FPGAs. The External Memory Interface Support Center shows the QDR II/QDR II+/QDR II+Xtreme/QDR IV SRAM memory interface performance of Intel FPGAs.

Technical Documentation

Intel offers the following technical documentation that contains information on device support for the QDR and QDR II memory interfaces, as shown in Table 1.

Table 1. QDR II SRAM Technical Documentation

Device Handbooks

Applicable Devices

Stratix® V Device Handbook:
External Memory Interfaces in Stratix V Devices (PDF) chapter

Stratix V

Stratix® IV Device Handbook:
External Memory Interfaces in Stratix IV Devices (PDF) chapter

Stratix IV

Stratix® III Device Handbook:
External Memory Interfaces in Stratix III Devices (PDF) chapter

Stratix III

Stratix® II Device Handbook:
External Memory Interfaces in Stratix II and Stratix II GX Devices (PDF) chapter
Selectable I/O Standards in Stratix II and Stratix II GX Devices (PDF) chapter

Stratix II

Arria® V Device Handbook:
External Memory Interfaces in Arria V Devices (PDF) chapter

Arria V, Arria V SoC

Arria® II GX Device Handbook:
External Memory Interfaces in Arria II Devices (PDF) chapter

Arria II GX

White Papers

Applicable Devices

Selecting the Right High-Speed Memory Technology for Your System (PDF)

All

User Guides

Applicable Devices

QDR II SRAM Controller MegaCore Function User Guide (PDF)

Stratix II/Stratix II GX
Stratix/Stratix GX

Hardware Test Results

Applicable Devices

Hardware Test Results

Stratix
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Software Support and Tools

Intel offers the tools shown in Table 3 to aid in the QDR II and QDR II+ SRAM memory interface design process.

Table 3. QDR II SRAM Software and Support Tools

Feature

Applicable Devices

TimeQuest Timing Analyzer

All

IBIS Models for I/O Buffers

All
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IP Cores and Reference Designs

Table 4 lists QDR II SRAM controller intellectual property (IP) cores and reference designs available from Intel.

Table 4. QDR II SRAM IP Cores and Reference Designs

Controller Name

Free Evaluation

Vendor

Devices Supported
QDR II SRAM Controller MegaCore Function Yes Intel Stratix V, Stratix IV, Stratix III,
Stratix II, Stratix II GX,
Stratix, Stratix GX
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Development Kits and Hardware Reference Platforms

Table 5 lists memory hardware reference platforms available from Intel. The Gerber files, layout, termination recommendations, and signal integrity analysis information of these reference platforms are also available.

Table 5. QDR II SRAM Development Kits and Hardware Reference Platforms

Board Name

Vendor

Contact Information
QDR II SRAM Stratix Memory Reference Platform Intel Contact your local Intel FAE
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