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

Internal connector (16 bits)

density high pins-68

 

 

 

 

 

 

SCSI Controller

 

 

 

 

 

 

 

SCSI LED

 

 

 

 

 

 

 

12V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LED connector

Osc.

 

 

 

 

 

 

 

 

 

 

 

(not loaded)

 

40MHz

 

 

 

 

 

VPP Translator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

eeprom

Clock

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flash Memory

 

 

 

 

 

 

 

 

 

 

 

 

24C16

Data

SYM53C875

 

 

 

 

 

 

 

28F020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2KBytes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

64KBytes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PCI Bus

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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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