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Title: Chipsets  
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Subject: List of acquisitions by Cisco Systems, CDMA Chipsets
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A chipset is a set of electronic components in an integrated circuit that manages the data flow between the processor, memory and peripherals. It is usually found in the motherboard of a computer. Chipsets are usually designed to work with a specific family of microprocessors. Because it controls communications between the processor and external devices, the chipset plays a crucial role in determining system performance.


In computing, the term chipset is commonly used to refer to a set of specialized chips on a computer's motherboard or an expansion card. In personal computers, the first chipset for the IBM PC AT was the NEAT chipset by Chips and Technologies for the Intel 80286 CPU.

In home computers, game consoles and arcade game hardware of the 1980s and 1990s, the term chipset was used for the custom audio and graphics chips. Examples include the Commodore Amiga's Original Chip Set or SEGA's System 16 chipset.

Based on Intel Pentium-class microprocessors, the term chipset often refers to a specific pair of chips on the motherboard: the northbridge and the southbridge. The northbridge links the CPU to very high-speed devices, especially RAM and graphics controllers, and the southbridge connects to lower-speed peripheral buses (such as PCI or ISA). In many modern chipsets, the southbridge contains some on-chip integrated peripherals, such as Ethernet, USB, and audio devices.

The manufacturer of a chipset often is independent from the manufacturer of the motherboard. Current manufacturers of chipsets for x86 motherboards include AMD, Broadcom, Intel, NVIDIA, SiS and VIA Technologies. Apple computers and Unix workstations have traditionally used custom-designed chipsets. Some server manufacturers also develop custom chipsets for their products.

In the 1980s, Chips and Technologies pioneered the manufacturing of chipsets for PC-compatible computers. Computer systems produced since then often share commonly used chipsets, even across widely disparate computing specialties. For example, the NCR 53C9x, a low-cost chipset implementing a SCSI interface to storage devices, could be found in Unix machines such as the MIPS Magnum, embedded devices, and personal computers.

Move toward processor integration in PCs

Traditionally in x86 computers, the processor's primary connection to the rest of the machine is through the motherboard chipset's northbridge. The northbridge is directly responsible for communications with high-speed devices (System memory, and primary expansion buses such as PCIe, AGP, PCI cards being common examples) and conversely any system communication back to the processor. This connection between the processor and northbridge is traditionally known as the front side bus (FSB). Requests to resources not directly controlled by the northbridge are offloaded to the southbridge - with the northbridge being an intermediary between the processor and the southbridge. The southbridge traditionally handles "everything else," generally lower speed peripherals and board functions (the largest being hard disk and storage connectivity) such as USB, parallel and serial communications. The connection between the northbridge and southbridge does not have a common name, but is usually a high speed interconnect proprietary to the chipset vendor. Thus any interaction between a CPU and main memory, any expansion device such as a graphics card(s), whether AGP, PCI or integrated into the motherboard, was directly controlled by the northbridge IC on behalf of the processor. This made processor performance highly dependent on the system chipset - especially the northbridge's memory performance and ability to shuttle this information back to the processor.

However in 2003 AMD's introduction the Athlon 64-bit series of processors[1] changed this. The Athlon64 marked the introduction of an integrated memory controller being incorporated into the processor itself allowing the processor to directly access and handle memory, negating the need for a traditional northbridge to do so. Intel followed suit in 2008 with the release of its Core i series CPUs and the X58 platform." In newer processors integration has further increased, primarily inclusion of the system's primary PCIe controller and integrated graphics directly on the CPU itself. As fewer functions are left un-handled by the processor itself, chipset venders have condensed the remaining north and southbridge functions into a single chip. Intel's version of this is the "Platform Controller Hub" (PCH), effectively an enhanced southbridge for the remaining peripherals, as traditional northbridge duties such as memory controller, expansion bus (PCIe) interface, and even on-board video controller are integrated into the CPU itself.

See also


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