Scope
This chapter describes the overall features and specifications of the VF2-350-SCW-RHD.
Features
The VF2-350-SCW-RHD incorporates one very compact removable winchester disk drive within a single module. The
hard disk drive is a high-performance winchester type with embedded disk drive control electronics. This microproces-
sor controlled embedded controller is on the hard disk and is compatible with ANSI X3.131-1986 SCSI commands.
The hard drive is a very high performer, with a 1-to-1 interleave and an average track-to-track access times of less than
10 milliseconds. It incorporates an embedded cache buffer which is operated in “look ahead” mode, providing buffering
for sequential sector operations. The hard drive has been carefully packaged with suitable control and power distribu-
tion connectors for direct attachment to single board computers in the VME chassis or to external devices.
WIDE 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 a wide 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 eighteen feet. The specifi-
cation provides 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 wide SCSI-2 pin definition. The direction indicated is relative to the host.
Pin
Signal
Direction
Description
35
-DB (12)
In/Out
Bidirectional data line 12
36
-DB (13)
In/Out
Bidirectional data line 13
37
-DB (14)
In/Out
Bidirectional data line 14
38
-DB (15)
In/Out
Bidirectional data line 15
39
-DB (P1)
In/Out
Bidirectional data line Parity1
40
-DB (0)
In/Out
Bidirectional data line 0
41
-DB (1)
In/Out
Bidirectional data line 1
42
-DB (2)
In/Out
Bidirectional data line 2
43
-DB (3)
In/Out
Bidirectional data line 3
44
-DB (4)
In/Out
Bidirectional data line 4
45
-DB (5)
In/Out
Bidirectional data line 5
46
-DB (6)
In/Out
Bidirectional data line 6
47
-DB (7)
In/Out
Bidirectional data line 7
48
-DB (P)
In/Out
Bidirectional data line Parity
49
GND
-
Ground reference
50
GND
-
Ground reference
51
TERMPWR
-
Terminator Power
52
TERMPWR
-
Terminator Power
53
RESERVED
-
Reserved for future use
54
GND
-
Ground reference
55
-ATN
In/Out
Attention
56
GND
-
Ground reference
57
-BSY
In/Out
Busy
58
-ACK
-
In
Acknowledge
59
-RST
In
Reset
60
-MSG
Out
Message
61
-SEL
In/Out
Select
62
-C/D
Out
Control/Data
63
-REQ
Out
Request
64
-I/O
Out
Input/Output
65
-DB (8)
In/Out
Bidirectional data line 8
66
-DB (9)
In/Out
Bidirectional data line 9
67
-DB (10 )
In/Out
Bidirectional data line 10
68
-DB (11)
In/Out
Bidirectional data line 11
Table 2-2: SCSI Pin Definition
NOTES:
(1)
All pins 1-34 shall be connected to ground, except for pins 16=DIFFSENS, 17, 18=Termpwr, 19=Reserved
(2)
The minus sign next to the signals indicates active low.
Features and Specifications
2-3
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