New Fully Buffered DIMM from Legacy Electronics Offers Designers Capacity, Speed, Reliability and Longevity Advantages.SAN CLEMENTE San Clemente (săn klĭmĕn`tē), city (1990 pop. 41,100), Orange co., S Calif., on the Pacific coast; inc. 1928. Camp Pendleton, a large U.S. marine base, adjoins the city, which is chiefly residential. , Calif. -- Design engineers now have new server application design options because of a new product: the FB-DIMM (Fully Buffered Dual In-line Memory Module See DIMM. (storage) Dual In-line Memory Module - Small circuit boards carrying memory integrated circuits, with signal and power pins on both sides of the board, in contrast to single-in-line memory modules (SIMM). ) introduced by Legacy Electronics. The FB-DIMM addresses the challenge designers face with the increased need for memory capacity at higher frequencies. Typically, the higher the frequency, the less the memory capacity. But with the FB-DIMM, engineers can address capacity challenges, while increasing speed, performance and reliability. The FB-DIMM inherently also addresses next-generation design needs. How FB-DIMMs Work "An FB-DIMM isolates loading at the memory controller caused by the DRAM (Dual Random Access Memory)," explained Kelvin Marino, Legacy's chief technology officer. "The FB-DIMM uses an AMB AMB Ambient AMB Ambassador AMB Amber AMB Ambulance AMB Associação Médica Brasileira (Brazil) AMB Ambulatory AMB Advanced Memory Buffer (FBDIMM control unit on DRAM) (Advanced Memory Buffer), replacing registers and phase lock loops (PLLs) used on current DIMMs. The AMB buffers the DRAM devices from the channel, and uses a high-speed, point-to-point differential interface to communicate with the controller." Capacity Advantages Marino added: "This process translates to increased system memory capacity when up to eight FB-DIMMs are placed in each channel. And the FB-DIMM serial signaling interface reduces memory channel pin count. The routing complexity on the motherboard decreases, as well as the number of processor pin outs." Performance and Reliability Enhancements With higher sustained memory throughput, the FB-DIMM performs reads and writes simultaneously, and supports a faster front-side bus. It also provides cyclical redundancy checking See CRC. (CRC (Cyclical Redundancy Checking) An error checking technique used to ensure the accuracy of transmitting digital data. The transmitted messages are divided into predetermined lengths which, used as dividends, are divided by a fixed divisor. ) protection for commands and data, and additional memory channels simplify memory mirroring implementation for redundancy. Finally, less I/O (Input/Output) The transfer of data between the CPU and a peripheral device. Every transfer is an output from one device and an input to another. See PC input/output. I/O - Input/Output per channel means the FB-DIMM also decreases FIT (Failure in Time) rates. Life Cycle Longevity Legacy Electronics expects smooth transitioning from DDR (Double Data Rate) Refers to an SDRAM memory chip that increases performance by doubling the effective data rate of the frontside bus. For more details, see SDRAM. DDR - Double Data Rate Random Access Memory 2 to DDR3, with little system redesign, and is working closely with JEDEC The division of the Electronic Industries Alliance (EIA) that deals with semiconductor standards (officially, the JEDEC Solid State Technology Association of EIA). JEDEC was formed in 1958 when the Joint Electron Tube Engineering Council (JETEC) split into two Joint Electron Device to help define standards for the next-generation FB2-DIMMs. The FB2-DIMMs will be targeted for use with DDR3, using the same connectors and routing topology as the current FB-DIMMs. Availability and More Information Jason Engle, Legacy Electronics' president, said, "We've already made a substantial investment into new test equipment, and are making the 512MB, 1GB and 2GB JEDEC standard DDR2 FB-DIMMs available immediately." More information, including a detailed product description and data sheet with block diagrams, is available from http://www.legacyelectronics.com/public/FBDIMM_Datasheets/. For details on worldwide sales representatives and distributor locations, go to www.legacyelectronics.com/corporate_contactus.php, call 949-498-9600, or toll-free at 888-466-3853. About Legacy Electronics Founded in 1993 and located among the new high-technology companies of south Orange County, Calif., Legacy Electronics is home of the patented Canopy(R) chip-stacking alternative, a three-dimensional printed circuit board subassembly sub·as·sem·bly n. pl. sub·as·sem·blies An assembled unit forming a component to be incorporated into a larger assembly. and process technology. Legacy also manufactures the low-form-factor Point Seven(TM) memory module product line. Legacy Electronics is an ISO (1) See ISO speed. (2) (International Organization for Standardization, Geneva, Switzerland, www.iso.ch) An organization that sets international standards, founded in 1946. The U.S. member body is ANSI. 9001:2000-certified manufacturer, designer and tester of high-speed, high-density memory modules, printed circuit boards, and other computer products. Editor's Note: FB-DIMM jpg images available at www.legacyelectronics.com/public/FBDIMM_Images. |
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