2-40
Functional Description
(or active) termination is recommended.
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 LSI53C1000 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
2.2.14 Select/Reselect During Selection/Reselection
In multithreaded SCSI I/O environments, it is not uncommon to be
selected or reselected while trying to perform selection/reselection. This
situation may occur when a SCSI controller (operating in the initiator
mode) tries to select a target and is reselected by another. The Select
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
DIFFSENS connects to the SCSI bus DIFFSENS line to detect what type of devices (SE,
LVD, or HVD) are connected to the SCSI bus.
DISCONNECT shuts down the terminator when it is not at the end of the bus. The
disconnect pin low enables the terminator.
Содержание LSI53C1000
Страница 6: ...vi Preface...
Страница 16: ...xvi Contents...
Страница 28: ...1 12 Introduction...
Страница 234: ...4 124 Registers...
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Страница 350: ...6 76 Specifications Figure 6 42 LSI53C1000 329 Ball Grid Array Bottom view...
Страница 352: ...6 78 Specifications...
Страница 360: ...A 8 Register Summary...
Страница 376: ...IX 12 Index...