LSI U80ALVD - Manual (Page 15)

Interface Descriptions 1-3
•
Performs complex SCSI bus sequences without interrupts, including
restore data pointers
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Serial EEPROM for user configuration utility
•
SCSI bus activity LED connector and on-board LED
1.2.3 Board Characteristics
•
PCI board dimensions,
152.4 x 88.90 mm (6.00 x 3.5 inches)
•
PCI Universal 32-bit card edge connector
•
HD 68-pin external connector
•
HD 68-pin internal connector
A mechanical drawing showing board dimensions and component layout
is located in
Appendix A, “Technical Specifications.”
1.3 Interface Descriptions
This section provides a more detailed explanation about the PCI
Interface, the SCSI Interface, Ultra2 SCSI Technology, and LVDlink
Technology.
1.3.1 The PCI Interface
PCI is a high-speed standard local bus for interfacing a number of I/O
components to the processor and memory subsystems in equipment
ranging from PCs to servers. The PCI functionality for the LSIU80ALVD
is contained within the LSI53C895A. The LSI53C895A connects directly
to the PCI bus and generates signal timing and bus protocol in
compliance with the PCI Specification Revision 2.1.
The PCI interface operates as a 32-bit DMA bus master. The connection
is made through edge connector J1 (see
Figure 2.1 ). The signal
definitions and pin numbers conform to the PCI Local Bus Specification
Revision 2.1 standard. The LSIU80ALVD conforms to the PCI universal
signaling environment for a 5 V or 3.3 V PCI bus.