Ultra Dma; Usb (Universal Serial Bus); Vcm (Virtual Channel Memory) - AOpen AX45-533 Online Manual
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Ultra DMA (or, more accurately, Ultra DMA/33) is a protocol for transferring data between a hard disk drive through the computer's data
path (or bus) to the computer's random access memory (RAM). The Ultra DMA/33 protocol transfers data in burst mode at a rate of
33.3MB/s, twice as fast as the previous
by the Quantum corporation, makes of hard disk drives, and Intel, makes of chipset that support computer bus technology. Ultra DMA
support in your computer means that it will boot (start) and open new applications more quickly. It will help users of graphic-intensive and
applications that require large amounts of access to data on the hard disk drive. Ultra DMA uses Cyclical Redundancy Checking (CRC),
offering a new level of data protection. Ultra DMA uses the same 40-pin IDE interface cable as PIO and DMA.
16.6MB/s x2 = 33MB/s
16.6MB/s x4 = 66MB/s
16.6MB/s x6 = 100MB/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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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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Direct Access Memory (DMA)
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interface. Ultra DMA was developed as a proposed industry standard
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