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The Serial ATA specification is designed to overcome speed limitations while enabling the storage interface to scale with the growing
media rate demands of PC platforms. Serial ATA is to replace parallel
ATA
with the compatibility with existing operating systems and
drivers, adding performance headroom for years to come. It is developed with data transfer rate of 150 Mbytes/second, and 300MB/s,
600MB/s to come. It reduces voltage and pins count requirements and can be implemented with thin and easy to route cables.
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SMBus is also called I
2
C bus. It is a two-wire bus developed for component communication (especially for semiconductor IC). For
example, set clock of clock generator for jumper-less motherboard. The data transfer rate of SMBus is only 100Kbit/s; it allows one host
to communicate with CPU and many masters and slaves to send/receive message.
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SPD is a small ROM or EEPROM device resided on the DIMM or RIMM. SPD stores memory module information such as DRAM timing
and chip parameters. SPD can be used by
BIOS
to decide best timing for this DIMM or RIMM.
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A Universal Serial Bus (USB) is an external bus (an interconnect) standard that supports data transfer rates of 12 Mbps. A single USB
port can be used to connect up to 127 peripheral devices, such as mouse, modems and keyboards. Introduced in 1996, USB has
completed replaced serial and parallel ports. It also supports plug-and-play installations and hot plugging Plug-and-play is the ability to
add and remove devices to a computer while the computer is running and have the operating system automatically recognize the
change. USB 2.0, which supports data transfer rates of 480 Mbps, has been widely used in motherboard these days.
114


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