參數(shù)資料
型號(hào): SYM53C140
廠商: LSI CORP
元件分類: 其它接口
英文描述: Ultra2 SCSI Bus Expander(Ultra2 SCSI總線擴(kuò)展器)
中文描述: SPECIALTY INTERFACE CIRCUIT, PQFP160
封裝: 32 MM, PLASTIC, QFP-160
文件頁數(shù): 11/68頁
文件大小: 928K
代理商: SYM53C140
General Description
1-3
Figure 1.2
SYM53C140 Server Clustering
Figure 1.2 demonstrates how SCSI bus expanders are used to couple
bus segments together without any impact of the SCSI protocol or
software. Configurations that use the SYM53C140 SCSI Bus Expander
in the Ultra2 mode (LVD to LVD) allow the system designer to take
advantage of the inherent cable distance, device connectivity, data
reliability, and increased transfer rate benefits of LVD signaling with
Ultra2 SCSI peripherals.
In Figure 1.2 example, the SYM53C140 is configured as a three port
expander board. This configuration allows segments A and B to be
treated as a point-to-point segment. Segment C is treated as a load
segment with at least 8 inches between every node. Table 1.2 shows the
various distance requirements for each SCSI bus mode.
Table 1.2
SCSI Bus Distance Requirements
Segment
Mode
Length Limit
A, B
LVD (Ultra2)
25 meters
SE (Ultra)
20 meters
HVD (Ultra)
25 meters
Segment C
LVD (Ultra2)
12 meters
SE (Ultra)
1.5 meters
HVD (Ultra)
25 meters
Segment A
Segment B
Segment C
Primary Server
Secondary Server
Shared Disk Subsystem
SCSI Bus
Expander
SCSI Bus
Expander
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