HP Vectra XU, Руководство по оптимизации

Страница: 40 / 75

1 Your PC’s Performance Features
Making the Most of Your PC’s IDE Channels
34 English
The IDE controller transfers data to or from IDE devices in response to
data transfers received or requested on your PC's PCI bus. The
technique used for a particular data transfer with an IDE device is
chosen according to the type of transfer received or requested on the
PCI bus. In this way, the IDE controller ensures that data transfers are
optimized between the PCI bus and the IDE device.
Your PC's IDE controller supports five PIO modes, PIO Mode 0 - 4, and
three DMA modes, DMA Mode 0 - 2. Higher numbered modes offer
increased data transfer rates than lower numbered modes. Not all IDE
devices support all of these modes. When transferring data with an IDE
device, the integrated IDE controller will select the highest numbered
mode supported by the IDE device.
Data transfer rates for all of these modes are given in the table below.
PCI Master Capability
The integrated IDE controller transfers data with your PC's processor
and memory through the PCI bus. PCI devices fall into two categories:
slaves and masters. A PCI slave is a device that can only respond to
transfers or requests made by another PCI device
—
it cannot initiate
transfers. A PCI master is able to initiate transfers and to take control
of the PCI bus while a transfer is being made.
Transfer Mode Maximum Transfer Rate
PIO Mode 0 3.33 MB per second
PIO Mode 1 5.22 MB per second
PIO Mode 2 8.33 MB per second
PIO Mode 3 11.1 MB per second
PIO Mode 4 16.7 MB per second
DMA Mode 0 4.2 MB per second
DMA Mode 1 13.3 MB per second
DMA Mode 2 16.7 MB per second