Universal Serial Bus (Usb) Controller - HP Vectra VL6 6 Technical Reference Manual

Transfer Rates Versus
Modes of Operation
Disk Capacity Versus
Modes of Addressing
2 System Board
Devices on the PCI Bus
The controller supports 32-bit Windows I/O transfers. Five PIO modes, and
three DMA modes are supported. The five supported PIO modes allow the
following transfer rates.
Mode
Cycle time (ns)
Transfer rate (MB/s)
The three DMA modes allow the following transfer rates:
Mode
Cycle time (ns)
Transfer rate (MB/s)
The amount of addressable space on a hard disk is limited by three factors:
the physical size of the hard disk, the addressing limit of the IDE hardware,
and the addressing limit of the BIOS. The Extended-CHS addressing scheme
allows larger disk capacities to be addressed than under CHS, by performing
a translation. If the Setup field has been set to
addressing (LBA) mode will be selected for each device that supports it.
Cylinders per
Device
CHS 64
ECHS 64
LBA -

Universal Serial Bus (USB) Controller

The OpenHCI (for USB release 1.0) USB controller is implemented as part
of the PIIX3 chip (the PCI/ISA bridge). It is driven from the PCI bus, and
provides support for the two stacked USB connectors on the back panel.
Over-current detection and protection is provided, but shared between the
two ports.
USB works only if the USB interface has been enabled within the HP Setup
program. Currently, only the Microsoft Windows 95 operating system
provides support for the USB.
The Microsoft Supplement 2.1 software, which provides support of the
Universal Serial Bus, can be obtained from the Hewlett-Packard World Wide
Web site:
http://www.hp.com/go/vectrasupport/
30
0 1
600 383
3.33 5.22
0 1
480 150
4.2 13.3
Heads per
Sectors per Track
Cylinder
16 1024
256 1024
- 256 M (=2
2 3
240 180
8.33 11.1
2
120
16.7
, the logical block
extended
Bytes per
Sector
512
512
28
) 512
4
120
16.7
Bytes per
Device
528 M
8.4 G
137 G