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1.2.3
Board Characteristics
1.3
Interface Descriptions
1.3.1
The PCI Interface
1.3.2
The SCSI Interface
The board characteristics for the LSIU40HVD are:
PCI board dimensions,
190 x 96.52 mm (7.50 x 3.80 inches)
Universal 32-bit card edge connector
This section provides a more detailed explanation about the PCI
Interface, the SCSI Interface, and Ultra SCSI.
PCI is a high-speed standard local bus for interfacing a number of I/O
components to the processor and memory subsystems in a high-end PC.
The PCI functionality for the LSIU40HVD is contained within the
LSI53C876 PCI to SCSI I/O Processor chip. The LSI53C876 chip
connects directly to the PCI bus and generates timing protocol in
compliance with the PCI specification.
The PCI interface operates as a 32-bit DMA bus master. The connection
is made through the edge connector J1 (see
definitions and pin numbers conform to the PCI Local Bus Specification
Revision 2.1 standard. The LSIU40HVD conforms to the PCI universal
signaling environment for a 5 V or 3.3 V PCI bus.
The SCSI functionality for the LSIU40HVD is contained within the LSI
Logic LSI53C876. The LSI53C876 chip connects directly to the two SCSI
buses and generates timing and protocol in compliance with the SCSI
standard.
The SCSI interface on the LSIU40HVD operates as a 16-bit,
synchronous or asynchronous, differential bus, and supports Ultra SCSI
protocols and 16-bit arbitration. Each interface is made through the
connectors J2 and J3 (for Channel A), or J5 and J6 (for Channel B).
Connectors J2 and J5 are 68-pin high-density, right-angle receptacles.
Interface Descriptions
Figure
2.1). The signal
1-3
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