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): 28/68頁
文件大小: 928K
代理商: SYM53C140
2-14
Functional Descriptions
means of accommodating terminators. The terminators should be
socketed, so they may be removed if not needed. Or, there should be a
means of disabling them with software.
Multi-mode terminators are required because they provide both LVD and
single-ended termination, depending on what mode of operation is
detected by the DIFFSENS pins. HVD requires a different termination
configuration. The use of active termination is highly recommended.
Figure 2.3
SCSI Termination
4
LINE1+
5
LINE1-
6
LINE2+
7
LINE2-
11 LINE3+
12 LINE3-
13 LINE4+
14 LINE4-
15 LINE5+
17 DISCNCT
16 LINE5-
32
LINE9+
31
LINE9-
30
LINE8+
29
LINE8-
25
LINE7+
24
LINE7-
23
LINE6+
22
LINE6-
33
34
35
SE
LVD
HVD
21
DIFF B
20
DIFFSENS
UCC5630
SD0+
SD0-
SD1+
SD1-
SD2+
SD2-
SD3+
SD3-
SD4+
SD4-
SDP0+
SDP0-
SD7+
SD7-
SD6+
SD6-
SD5+
SD5-
22K
0.1
μ
F
To LED
Drivers
DIFFSENS connects to the SCSI bus DIFFSENS line to detect what type of devices
(single-ended, LVD, or high-voltage differential) are connected to the SCSI bus.
DISCNCT shuts down the terminator when it is not at the end of the bus. The
disconnect pin low enables the terminator.
*Use additional UCC5630 terminators to terminate the SCSI control signals and
wide SCSI data byte as needed.
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