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Home > Technology Center > External Memory > SDR SDRAM Print This Page Subscribe to Email Memory Solutions Center—SDR SDRAM SDR SDRAM was the first DRAM type to support the transfer of data on every clock by providing a clock-synchronous interface. This significantly boosted bandwidth compared with fast page mode (FPM) and extended data out (EDO) DRAM. SDRAM is still being used today, although DDR SDRAM is now the lowest-cost memory type available. Altera and its partners provide complete system solutions, including technical collateral, software support, demo boards, intellectual property (IP) cores, and reference designs to help to successfully interface Altera® FPGAs to SDR memories. Table 1 lists SDR SDRAM memory interface performance support in Altera FPGAs. Table 1. SDR SDRAM Memory Interface Performance Support Device SDR SDRAM Interface Performance Stratix® II 200 Mbps (200 MHz) Stratix II GX 200 Mbps (200 MHz) Stratix 167 Mbps (167 MHz) Stratix GX 167 Mbps (167 MHz) Cyclone® 133 Mbps (133 MHz) APEX™ II 167 Mbps (167 MHz) Technical Documentation Altera offers technical collateral that contains device support information for SDR memory interfaces as shown in Table 2. Table 2. SDR SDRAM Technical Documentation Device Handbooks Applicable Devices Stratix II Device Handbook: External Memory Device Interfaces (PDF) chapter Using Selectable I/O Standards (PDF) chapter Stratix II Stratix II GX Device Handbook: External Memory Device Interfaces (PDF) chapter Using Selectable I/O Standards (PDF) chapter Stratix II GX Stratix Device Handbook:/Stratix GX Device Handbook: External Memory Device Interfaces (PDF) chapter Using Selectable I/O Standards (PDF) chapter Stratix / Stratix GX Cyclone Device Handbook: External Memory Device Interfaces (PDF) chapter Using Selectable I/O Standards (PDF) chapter Cyclone White Papers Applicable Devices Selecting the Right High-Speed Memory Technology for Your System (PDF) ALL Software Support and Tools Altera offers software support and tools that aid in the SDR SDRAM memory interface design process, as shown in Table 3. Table 3. SDR SDRAM Software Support and Tools Feature Applicable Devices Stratix IBIS Models Stratix SPICE Models for Stratix I/O Buffers (Contact Altera or local Altera field applications engineer (FAE)) Stratix SPICE Models for Stratix GX I/O Buffers (Contact Altera or local Altera FAE) Stratix GX IP Cores and Reference Designs Altera offers a free SDR SDRAM reference design for APEX II, Stratix, Stratix GX, and Cyclone devices. In addition, SDR SDRAM controller IP cores are available from Altera Megafunction Partners Program (AMPPSM) partners at the IP MegaStore™ website. Table 4 lists SDR SDRAM IP cores and reference designs built by Altera and AMPP partners. Table 4. SDR SDRAM IP Cores and Reference Designs Controller Name Free Evaluation Vendor Device Families Supported SDR SDRAM Reference Design Yes (Unlicensed) Altera Stratix/Stratix GX, Cyclone, APEX II SDRAM Controller with Avalon® Interface (PDF) Yes (Part of Nios® II Development Kit) Altera Stratix II, Stratix/Stratix GX, Cyclone SDR SDRAM Controller Yes Northwest Logic Stratix/Stratix GX, APEX II Development Kits and Hardware Reference Platforms Altera offers demo boards that enable you to implement and test SDR SDRAM memory interfaces. Table 5 lists the demo boards available for SDR memory interfaces. Table 5. SDR SDRAM Development Kits and Hardware Reference Platforms Board Name Device Families Supported Nios Development Kit, Stratix II Edition Stratix II DSP Development Kit, Stratix II Edition Stratix II SDR SDRAM Memory Vendors Micron, Inc Infineon Technologies Samsung Elpida NEC Related Links External Memory Device Interfaces in Stratix II/Stratix II GX/Stratix/Stratix GX Devices External Memory Device Interfaces in Cyclone II/Cyclone Devices External Memory Interface Support in APEX II Devices Device Support Center (Signaling and Board Design) Rate This Page   Related Links Memory Solution Center Memory Interface Design Online Demonstration Memory Controller IP Megastore

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