Centellis CT Series 16000 User’s Manual
Chassis Layout and Interconnection
20000325 420 000 AB
Page 25
3.3.1
SCSI Bus Cable Length Guidelines
The SCSI standard sets a maximum of 6.0 meters total length for all SCSI signals. The internal
SCSI bus length on the Centellis system chassis is 0.68 meters maximum. For specific information
about installing SCSI devices consult the manual that comes with the device.
3.3.2
SCSI Bus Termination
The Centellis CT Series 16000 system chassis automatically terminates the SCSI bus. This termi-
nation response can be overridden if a cable is plugged into the chassis rear connector. Users must
supply termination on the SCSI segments external to the 16000.
3.4
CompactPCI Connector Pin Assignments
The CompactPCI bus is designed for 5V and 3.3V operation. Centellis CT Series 16000 chassis
are preset for 5V operation.
3.4.1
J1/J2 Backplane CompactPCI Connector
The J1 and J2 connectors, combined, provide a 220-pin 2 mm x 2 mm female connector for the
CompactPCI backplane interface. Blue keying is used on J1 to indicate 5V operation. Tables 12
and 13 provide the signal type of each J1 and J2 interface pin.
Table 12:
J1 CompactPCI Interface
PIN
Z
A
B
C
D
E
F
25
GND
5V
REQ64#
ENUM
3.3V
5V
GND
24
GND
AD(1)
5V
V(I/O)
AD(O)
ACK64#
GND
23
GND
3.3V
AD(4)
AD(3)
5V
AD(2)
GND
22
GND
AD(7)
GND
3.3V
AD(6)
AD(5)
GND
21
GND
3.3V
AD(9)
AD(8)
M66EN
C/BE(0)#
GND
20
GND
AD(12)
GND
V(I/O)
AD(11)
AD(10)
GND
19
GND
3.3V
AD(15)
AD(14)
GND
AD(13)
GND
18
GND
SERR#
GND
3.3V
PAR
C/BE(1)#
GND
17
GND
3.3V
SDONE
SBO#
GND
PERR#
GND
16
GND
DEVSEL#
GND
V(I/O)
STOP#
LOCK#
GND
15
GND
3.3V
FRAME#
IRDY#
GND
TRDY#
GND
14
KEY
KEY
KEY
KEY
KEY
KEY
KEY
13
KEY
KEY
KEY
KEY
KEY
KEY
KEY
12
KEY
KEY
KEY
KEY
KEY
KEY
KEY
11
GND
AD(18)
AD(17)
AD(16)
GND
C/BE(2)#
GND
10
GND
AD(21)
GND
3.3V
AD(20)
AD(19)
GND
9
GND
C/BE(3)#
IDSEL
AD(23)
GND
AD(22)
GND
8
GND
AD(26)
GND
V(I/O)
AD(25)
AD(24)
GND
7
GND
AD(30)
AD(29)
AD(28)
GND
AD(27)
GND
6
GND
REQ#
GND
3.3V
CLK
AD(31)
GND
5
GND
BRSV(B10)
BRSV(A11)
RST#
GND
GNT#
GND
4
GND
BRSV(A9)
GND
V(I/O)
INTP
INTS
GND
3
GND
INTA#
INTB#
INTC#
5V
INTD#
GND
2
GND
TCK
5V
TMS
TDO
TDI
GND
1
GND
5V
-12V
TRST#
+12V
5V
GND