Hp A7818-IE002 Uživatelský manuál stáhnout pdf (Strana 104)

Hardware Components

PCI Cards

Chapter 5

104

PYRO 1394/Firewire Host Controller Card

The PYRO card is Plug and Play, fully IEEE 1394 compliant and provides 3 ports (2

external and 1 internal) at 400 Mbps. The IEEE 1394 standard is supported on Windows

2000 but not on Windows NT 4.0.

For HP-supported drivers for the PYRO card, see the

http://www.hp.com/go/workstationsupport web page. For additional product

information on the PYRO card, see http://www.adstech.com.

Table 5-4

Feature Description

Double Transition

Clocking

Changes the digital protocol to use both edges of the SCSI

request/acknowledge signal clock. Allows designers to use Ultra2 cables.

The signal in an Ultra2 SCSI runs a 40MHz, whereas data runs at only

20MHz or 80MB/sec on a 16-bit wide bus.

Using both edges of the same signal at 40MHz, you can increase the data

rate to 40MB/sec or 160MB/sec on a 16-bit wide bus.

Cyclical Redundancy

Check

Provides extra data protection for marginal cables that are connected to

external devices. The Ultra3 SCSI cyclical redundancy check detects all:

• Single-bit errors

• Double-bit errors

• Odd number of errors

• Burst errors up to 32-bits long

Domain Validation Tests networks, cables, backplanes, terminators, and hard disk drives to

ensure that the environment is operating at required speciﬁcation. If

reliability is at risk, the transfer speed is lowered.

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Hp A7818-IE002 Uživatelský manuál Strana 104