Avago Technologies LSI53C1000R - Manual (Page 70)

2-40 Functional Description
Version 2.2 Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
(or active) termination is recommended. Figure 2.4 shows an active
terminator. TolerANT technology active negation can be used with either
termination network.
For information on terminators that support LVD, refer to the SPI-3 draft
standard.
Note: If the LSI53C1000R is used in a design with an 8-bit SCSI
bus, all 16 data lines must be terminated.
Figure 2.4 Regulated Termination for Ultra160 SCSI
4
5
6
7
11
12
13
14
15
16
17
Line1
+
Line1
−
Line2
+
Line2
−
Line3
+
Line3
−
Line4
+
Line4
−
Line5
+
Line5
−
DISCONNECT
Line9
−
Line9
+
Line8
−
Line8
+
Line7
−
Line7
+
Line6
−
Line6
+
SE
LVD
HVD
DIFFSENS
DIFF B
32
31
30
29
25
24
23
22
33
34
35
20
21
4.7 mF
To LED
Drivers
SDP0
−
SDP0
+
SD7
−
SD7
+
SD6
−
SD6
+
SD5
−
SD5
+
SD0
+
SD0
−
SD1
+
SD1
−
SD2
+
SD2
−
SD3
+
SD3
−
SD4
+
SD4
−
51 K
1. DIFFSENS connects to the SCSI bus DIFFSENS line to detect what type of devices
(SE, LVD, or HVD) are connected to the SCSI bus.
2. DISCONNECT shuts down the terminator when it is not at the end of the bus. The
disconnect pin low enables the terminator.
Notes: