Scope
This chapter describes the overall features and specifications of the VX3-350-SCW-DAT.
Features
The VX3-350-SCW-DAT incorporates a very compact winchester disk drive and a DDS-4 DAT drive within a single
module. The tape drive is physically compact, occupying only 3 1/2” of panel in the half-height form factor. The hard
disk drive is a high-performance winchester type with embedded disk drive control electronics. This embedded con-
troller is on the hard disk and the tape drive are microprocessor controlled and compatible with ANSI X3.131-1986
SCSI commands. The hard drive is a very high performer, with an average track-to-track access times of less than 6
milliseconds. It incorporates at least an embedded 2 Mbyte buffer which is operated in “look ahead” mode, providing
buffering for sequential sector operations. The tape drive is DDS-4 compatible. Both the hard drive and the tape drive
have been carefully packaged with suitable control cables and power distribution connectors for direct attachment to
single board computers in the VME chassis or to external devices.
SCSI Interface Description
In order to provide a method of embedding the disk drive control electronics within the hard disk drive, several disk
drive manufacturers jointly defined an interface specification. This specification for the
Small Computer System Inter-
face has become known throughout the industry as “SCSI”. Basically, the SCSI interface consists of the required
address, data and control signals from an SCSI Host Adapter. Since a goal of the specification is to allow the disk drive
to be connected via standard cable, the specification required buffering of all signals so that the drive could be mounted
a suitable distance from the board interface. This distance, however, is limited to 12 meters. The specification pro-
vides all signals via a 68 pin header connector for use with standard 68 conductor cable and connectors. Table 2-2 is a
description of the Ultra-160 SCSI pin definition. The direction indicated is relative to the host(IN=From Host/Out=To
Host).
Pin
Signal
Direction
Description
Pin
Signal
1
+DB (12)
In/Out
Bidirectional data line 12
35
-DB(12)
2
+DB (13)
In/Out
Bidirectional data line 13
36
-DB(13)
3
+DB (14)
In/Out
Bidirectional data line 14
37
-DB(14)
4
+DB (15)
In/Out
Bidirectional data line 15
38
-DB(15)
5
+DB (P1)
In/Out
Bidirectional data line P1
39
-DB(P1)
6
+DB (0)
In/Out
Bidirectional data line 0
40
-DB(0)
7
+DB (1)
In/Out
Bidirectional data line 1
41
-DB(1)
8
+DB (2)
In/Out
Bidirectional data line 2
42
-DB(2)
9
+DB (3)
In/Out
Bidirectional data line 3
43
-DB(3)
10
+DB (4)
In/Out
Bidirectional data line 4
44
-DB(4)
11
+DB (5)
In/Out
Bidirectional data line 5
45
-DB(5)
12
+DB (6)
In/Out
Bidirectional data line 6
46
-DB(6)
13
+DB (7)
In/Out
Bidirectional data line 7
47
-DB(7)
14
+DB (P)
In/Out
Bidirectional data line P
48
-DB(P)
15
GND
-
Ground reference
49
GND
16
DIFFSNS (1)
-
50
GND
17
TERMPWR
-
Terminator Power
51
TERMPWR
18
TERMPWR
-
Terminator Power
52
TERMPWR
19
RESERVED
-
Reserved for future use
53
RESERVED
20
GND
-
Ground reference
54
GND
21
+ATN
In/Out
Attention
55
-ATN
22
GND
-
Ground reference
56
GND
23
+BSY
In/Out
Busy
57
-BSY
24
+ACK
-
In
Acknowledge
58
-ACK
25
+RST
In
Reset
59
-RST
26
+MSG
Out
Message
60
-MSG
27
+SEL
In/Out
Select
61
-SEL
28
+C/D
Out
Control/Data
62
-C/D
29
+REQ
Out
Request
63
-REQ
30
+I/O
Out
Input/Output
64
-I/O
31
+DB (8)
In/Out
Bidirectional data line 8
65
-DB(8)
32
+DB (9)
In/Out
Bidirectional data line 9
66
-DB(9)
33
+DB (10)
In/Out
Bidirectional data line 10
67
-DB(10)
34
+DB (11)
In/Out
Bidirectional data line 11
38
-DB(11)
Table 2-2: SCSI Pin Definition
NOTES:
(1)
The DIFFSNS voltage level determines single-ended or LVD operation.
(2)
The minus sign next to the signals indicates active low, plus indicates active high.
Features and Specifications
2-3
Содержание VX3-350-SCW-DAT
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Страница 10: ...Chapter 2 Features and Specifications...
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Страница 15: ...Chapter 3 Configuration Installation and Operation...
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Страница 19: ...Chapter 5 SDT 11000 DAT Drive Details...
Страница 22: ...Chapter 6 Product Support Service and Warranty...
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