HP XA manual Scsi / LAN Combo Board, PCI Interface

3 Interface Devices and Mass-Storage Drives

SCSI / LAN Combo Board

SCSI / LAN Combo Board

Certain HP Kayak XA PC Workstations are supplied with an integrated SCSI / 10BT/100TX LAN combo board. Because the SCSI / LAN combo board includes two controllers, only one PCI slot is necessary for installing this board. The PCI and SCSI controllers access the PCI bus through a PCI bridge. The SCSI and PCI functionalities of the SYM8751SP are contained within the Symbios Logic SYM5C875J PCI-SCSI I/O Processor chip.

The following hardware functional diagram shows the SCSI part of the SCSI/ LAN Combo board.

External connector (8 bits)

Ext. Device

To ExtStart Connector

50-pins high density

Term. Power				5V
					Term. Power
		Fuse 3A
Ext. Device					Int. Device
	Termination L
			PCI Bus

Termination H

68-pins high density

Internal connector (16 bits)

SCSI LED

LED connector

(not loaded)

		SCSI Controller
Osc.
40MHz
eeprom	Clock
24C16	Data	SYM53C875
2KBytes
		PCI Bus

12V

VPP Translator

Flash Memory

28F020

64KBytes

PCI Interface

The PCI interface operates as a 32-bit DMA bus master. The connection is made through the edge connector. The signal definitions and pin numbers conform to the PCI Local Bus Specification Revision 2.0 standard. The PCI interface conforms to the PCI universal signaling environment for a 5 volt or 3.3 volt PCI bus.

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