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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.
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SPD is a small ROM or
EEPROM
and chip parameters. SPD can be used by
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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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USB is a 4-pin serial peripheral bus that is capable of cascading low/medium speed peripherals (less than 10Mbit/s) such as keyboard,
mouse, joystick, scanner, printer and modem. With USB, the traditional complex cables from back panel of your PC can be eliminated.
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to decide best timing for this DIMM or RIMM.
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or RIMM. SPD stores memory module information such as DRAM timing
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