LSI LSI22915A, Руководство пользователя, Страница: 15 / 50

Features 1-3
Version 1.3 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
•
Serial nonvolatile random access memory (NVRAM) on each
channel for user configuration utility and SCAM information storage
•
SCSI activity LED for each channel
1.2.3 Board Characteristics
The board characteristics of the LSI22915A are:
•
PCI board dimensions of 4.2 by 8.4 inches (106.68 by 213.36 mm)
•
Universal 64-bit PCI card edge connector
•
Two 68-pin Very High Density Cable Interconnect (VHDCI)
connectors, one for each external channel
•
Two 68-pin high density (HD) connectors, one for each internal channel
•
ISA/EISA bracket
1.2.4 LED Interface
The LSI22915A LED interface is a four-wire arrangement that allows you
to connect an LED harness to the board. The connector on the
LSI22915A is HDR2 for both channels.
Table 3.2 on page 3-4 lists the
signal names and pin numbers for this LED interface.
The LSI22915A has four individual LEDs per channel to indicate the
operating state of the board.
1.2.5 Ultra160 SCSI Benefits
Ultra160 SCSI is an extension of the SCSI Parallel Interface-3 (SPI-3)
draft standard that allows faster synchronous SCSI data transfer rates
than Ultra2 SCSI. When enabled, Ultra160 SCSI performs
80 megatransfers/s, resulting in approximately double the synchronous
data transfer rates of Ultra2 SCSI. The LSI53C1010 performs 16-bit,
Ultra160 SCSI synchronous data transfers as fast as 160 Mbytes/s.
The faster data transfer rate is most noticeable in heavily loaded systems
or large block size applications such as video on demand and image
processing.
Important. To achieve Ultra160 SCSI performance, you must connect
only LVD devices to the bus. If you mix any SE devices with
LVD devices, the entire bus drops to SE, limiting bus
performance to Ultra SCSI levels.