DDR

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Related to DDR SDRAM: DDR2 SDRAM

DDR

(computer science)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

DDR

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DDR

(Double Data Rate) An SDRAM memory chip that increases performance by doubling the effective data rate of the frontside bus. For more details, see SDRAM.
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References in periodicals archive ?
Although the FTC found that Rambus had acquired monopoly power as a result of its failure to disclose its intellectual property holdings when JEDEC was adopting its initial SDRAM and DDR SDRAM standards, and thus would have required Rambus to reduce its royalties on those technologies, it concluded that "[t]he record does not support a finding that lock-in conferred durable monopoly power over DDR2 SDRAM by 2000." (58) In contrast, the EC obtained commitments from Rambus to cap royalty rates on subsequent versions of its technologies.
Packed with other technology typically found in more expensive systems, the J4355 includes a high-performance Intel Pentium 4 530 (3.0GHz) processor with Hyper Threading technology and 512MB of DDR SDRAM, dedicated as two 256MB modules to provide dual-channel performance.
This was the genesis of the current DDR SDRAM device design and manufacturing efforts.
It has already begun supplying selected customers with sample 64Mb DDR SDRAM chips and will make engineering samples available this quarter.
In addition to the 512Mb DDR SDRAM product family, ISSI offers SDR, DDR, mobile SDR/DDR, and DDR2 SDRAM product families in a variety of densities, organizations, and temperature ranges as well as a complete line of SRAMs targeted for automotive, networking, telecom, industrial and consumer applications.
The board supports up to 1 GB of DDR SDRAM using an SO-DIMM socket.
The capacitance Ceff for C1, C2, C3, C4, C5 and C6 should equal one-half Cin where Cin represents DDR SDRAM input capacitance.
-- 1.25 GHz PowerPC G4 processor; -- 512MB of 333 MHz DDR SDRAM, expandable to 1GB; -- 40GB Ultra ATA hard drive; -- Combo (DVD-ROM/CD-RW) optical drive; -- ATI Radeon 9200 graphics processor with 32MB video memory; -- one FireWire 400 and two USB 2.0 ports; -- 10/100 BASE-T Ethernet networking and 56K V.92 modem; -- internal support for AirPort Extreme wireless networking and Bluetooth; -- DVI or VGA out (adapter included), composite/S-video out with optional adapter; and -- built-in speaker and headphone/line out.
Equipped with one Gbyte of 266-MHz DDR SDRAM and two Mbytes of L2 cache, the P620 features a high-resolution dual-channel display interface with 2D/3D acceleration, two Gigabit Ethernet ports with Boot and Wake-On-LAN capabilities, and an AC-97 audio Line In/Out interface.
Standard features include: Intel Xeon 2.8 GHz, 3.0 GHz or 3.2 GHz processors with a 1 MB L2 cache; an 800 MHz front side bus; 512 MB PC2700 DDR SDRAM memory (expandable to 8 GB); PCI-X and PCI-Express expansion slots; six hot-pluggable or nonhot-pluggable SCSI hard drives or four hot-pluggable SATA hard drives; a 5U rack; and two USB 2.0 ports.