2 the scsi interface, The scsi interface, Pci connector ji (bottom) – LSI 8751D User Manual
Page 43
Operational Environment
3-5
3.2.2 The SCSI Interface
The SCSI interface operates as 16-bit, synchronous or asynchronous,
High Voltage Differential (HVD) bus, and supports SCSI-3 protocols and
16-bit arbitration. The signal definitions conform to the SCSI-2 differential
standard. The interface is made through connectors J2 and J3.
Connector J2 is a 68-pin, high density, right-angle receptacle used for
internal connections. Connector J3 is a 68-pin, high density, right-angle
receptacle that protrudes through the back panel bracket. SCSI
termination is provided through a HVD plug-in terminator. SCSI
termination power is also supplied by the board.
shows
the signal assignments for J2 and J3 SCSI HVD connectors.
Table 3.3
PCI Connector JI (Bottom)
Signal Name
1
1. Shaded signals are not connected.
Pin
Signal Name
Pin
Signal Name
Pin
Signal Name
Pin
TRST/
1
GNT/
17
+3.3 V
33
AD09
49
+12V
2
GND
18
FRAME/
34
KEYWAY
50
TMS
3
RESERVED
19
GND
35
KEYWAY
51
TDI
4
AD30
20
TRDY/
36
C_BE0/
52
+5 V
5
+3.3 V
21
GND
37
+3.3V
53
INTA/
6
AD28
22
STOP/
38
AD06
54
INTC/
7
AD26
23
+3.3 V
39
AD04
55
+5 V
8
GND
24
SDONE
40
GND
56
RESERVED
9
AD24
25
SBO/
41
AD02
57
3 V/5 V
10
IDSEL
26
GND
42
AD00
58
RESERVED
11
+3.3 V
27
PAR
43
3 V/5 V
59
KEYWAY
12
AD22
28
AD15
44
REQ64/
60
KEYWAY
13
AD20
29
+3.3 V
45
+5 V
61
RESERVED
14
GND
30
AD13
46
+5 V
62
RST/
15
AD18
31
AD11
47
3 V/5 V
16
AD16
32
GND
48