HP Vectra XW Optimization Manual page 36

PCI Master Capability
1 Your Personal Workstation's Performance Features
Making the Most of Your System's IDE Channels
The IDE controller transfers data to or from IDE devices in response to
data transfers received or requested on your system'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 system'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.
Transfer Mode
PIO Mode 0
PIO Mode 1
PIO Mode 2
PIO Mode 3
PIO Mode 4
DMA Mode 0
DMA Mode 1
DMA Mode 2
The integrated IDE controller transfers data with your system'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
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.
30 English
Maximum Transfer Rate
3.33 MB per second
5.22 MB per second
8.33 MB per second
11.1 MB per second
16.7 MB per second
4.2 MB per second
13.3 MB per second
16.7 MB per second
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