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Concept
Geode (processor)
Summary
Geode was a series of x86-compatible system-on-a-chip (SoC) microprocessors and I/O companions produced by AMD, targeted at the embedded computing market.
The series was originally launched by National Semiconductor as the Geode family in 1999. The original Geode processor core itself is derived from the Cyrix MediaGX platform, which was acquired in National's merger with Cyrix in 1997. AMD bought the Geode business from National in August 2003 to augment its existing line of embedded x86 processor products. Before aquirering Geode, AMD marketed the AMD Élan, a family of 32-Bit embedded SoCs based on their own Am386, Am486 and Am586 microprocessors. All of these products have been backed with a long-term supply guarantee to meet the needs of embedded processors. However, after acquiring Geode, the product was suddenly discontinued.
AMD expanded the Geode series to two classes of processor: the MediaGX-derived Geode GX and LX, and the modern Athlon-derived Geode NX.
Geode processors are optimized for low power consumption and low cost while still remaining compatible with software written for the x86 platform. The MediaGX-derived processors lack modern features such as SSE and a large on-die L1 cache but these are offered on the more recent Athlon-derived Geode NX. Geode processors tightly integrate some of the functions normally provided by a separate chipset, such as the northbridge. Whilst the processor family is best suited for thin client, set top box and embedded computing applications, it can be found in unusual applications such as the Nao robot and the Win Enterprise IP-PBX.
The One Laptop per Child project used the GX series Geode processor in OLPC XO-1 prototypes, but moved to the Geode LX for production. The Linutop (rebranded Artec ThinCan DBE61C or rebranded FIC ION603A) is also based on the Geode LX. 3Com Audrey was powered by a 200 MHz Geode GX1.
The SCxxxx range of Geode devices are a single-chip version, comparable to the SiS 552, VIA CoreFusion or Intel's Tolapai, which integrate the CPU, memory controller, graphics and I/O devices into one package.
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