Avago Technologies LSI53C896 - Manual (Page 67)

SCSI Functional Description 2-39
Version 3.3 Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
(or active) termination is recommended. Figure 2.6 shows a Unitrode
active terminator. TolerANT technology active negation can be used with
either termination network.
For details on terminators that support LVD, refer to the SPI-2 draft
standard.
Note: If the LSI53C896 is to be used in a design with only an 8-bit
SCSI bus, all 16 data lines must be terminated.
Figure 2.6 Regulated Termination for Ultra2 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
µ
F
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: