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SMBus is also called I2C 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.
S
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SPD is a small ROM or
EEPROM
module information such as DRAM timing and chip parameters. SPD can be used by
decide best timing for this DIMM or RIMM.
U
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3
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3
Unlike traditional PIO/DMA mode, which only uses the rising edge of IDE command signal to
transfer data. UDMA/33 uses both rising edge and falling edge, the data transfer rate is double of
the PIO mode 4 or DMA mode 2.
16.6MB/s x2 = 33MB/s
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device resided on the
166
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DIMM
or RIMM. SPD stores memory
n
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BIOS
to
A
Open
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