HP XM600 - Kayak - 128 MB RAM Technical Reference Manual page 87

Internal Connection
External Connection
Internal SCSI cable
LED Activity cable
SCSI LED
Connector
The internal connector is a Wide SCSI 68-pin high-density connector. The
internal ribbon cable has to be connected to this connector.
The external connector is located on the PCI bracket. It is a shielded Wide
SCSI 68-pin high-density connector. Any cable connected to this connector
must be shielded.
When running in LVD mode, the external cable should not exceed 12 m.
•
When running in SE mode, the external cable should not exceed 1,5 m.
•
Cables
The internal SCSI cable is supplied with an embedded multi-mode
terminator at one end of it.
The LED cable supplies SCSI LED activity to the front panel hard disk LED.
For this to work, the SCSI LED cable must be connected to the LED Activity
connector on the Ultra2 SCSI PCI Adapter card (refer to graphic on
85) and the SCSI LED connector on the system board.
The connectors on both ends of the cable are identical, hence they can be
connected to either connector.
SCSI Controller
The SCSI controller characteristics are as follows:
PCI 32-bit 33 MHz chip.
•
SCSI Multimode LVD/SE.
•
SCSI Bus
LVDlink™ transceivers meet all of the SPI-2 standard requirements.
•
Uses LSI Logic TolerANT
•
single-ended SCSI signal integrity.
Pre-fetches up to 8 words of SCSI SCRIPTS
•
overhead.
Supports SCSI SCRIPTS Load and Store instructions for more efficient
•
moving of data between memory and chip register space.
Includes 4 KB of internal RAM for SCRIPTS instruction storage to reduce
•
or eliminate instruction fetches over the PCI bus.
Improved support for large block transfers at Ultra2 SCSI speeds.
•
Provides data reliability and cable distance of differential SCSI without
•
cost of external differential transceivers.
Improves connectivity (up to 15 LVD Ultra2 SCSI devices) and cable
•
lengths (up to 12 meters with Ultra2 SCSI). Longer cables may be possible
®
active negation technology for improved
®
instructions to save PCI bus
3 Interface Cards
SCSI Adapter Cards
page
87