pc

10.25 pc 11.25 pc

38

34.5 pc

1.3Interface Descriptions

This section provides a more detailed explanation about the PCI

Interface, the SCSI Interface, Ultra160 SCSI Technology, and LVDlink

Technology.

1.3.1The PCI Interface

 

PCI, a high-speed standard local bus, interfaces I/O components to the

 

processor and memory subsystems in equipment ranging from PCs to

 

servers. The PCI functionality for the LSIU160 is contained within the

 

LSI53C1010. The LSI53C1010 connects directly to the PCI bus and

 

generates signal timing and bus protocol in compliance with the PCI

 

Specification Revision 2.2.

 

The PCI interface operates as a 64-bit DMA bus master capable of

 

64-bit addressing. The connection is made through edge connector J1,

 

shown in Figure 2.1 on page 2-5. The signal definitions and pin numbers

 

conform to the PCI Local Bus Specification Revision 2.2 standard. The

pc

LSIU160 conforms to the PCI universal signaling environment for a 5 V

or 3.3 V PCI bus.

 

1.3.2The SCSI Interface

The SCSI functionality for the LSIU160 is contained within the LSI53C1010. This chip is a PCI to Ultra160 SCSI Controller with LVDlink Universal Transceivers. It connects directly to the SCSI bus and generates signal timing and bus protocol in compliance with SCSI standards.

The SCSI interface on the LSIU160 operates as an 8-bit or 16-bit interface. It supports 8-bit or 16-bit, synchronous and asynchronous, LVD or SE, Fast, Ultra, Ultra2, and Ultra160 SCSI protocols in various combinations. The interface is made through connectors J3 and J4 (see Figure 2.1). Internal connector J4 is a 68-pin HD right angle latching connector. External connector J3 is a shielded 68-pin HD right angle connector exposed in the back panel bracket. LVD/SE dual mode, active termination is provided on the LSIU160. Termination is automatically disabled when both SCSI connectors are used. The LSIU160 supplies SCSI bus TERMPWR through a blocking diode and a self-resetting 1.5 A short circuit protection device. A 40 MHz oscillator is installed on the

Interface Descriptions

1-5