Smbus (System Management Bus); Spd (Serial Presence Detect); Usb 2.0 (Universal Serial Bus); Vcm (Virtual Channel Memory) - AOpen AX4SG Online Manual
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SMBus is also called I
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
and chip parameters. SPD can be used by
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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.
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NEC's Virtual Channel Memory (VCM) is a new DRAM core architecture that dramatically improves the memory system's ability to service
multimedia requirements. VCM increases memory bus efficiency and performance of any DRAM technology by providing a set of fast static
registers between the memory core and I/O pins. Using VCM technology results in reduced data access latency and reduced power
consumption.
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device resided on the DIMM or RIMM. SPD stores memory module information such as DRAM timing
BIOS
to decide best timing for this DIMM or RIMM.
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