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Appendix C: SAS-747TQ Backplane Specifications
C.6 Front Connector and Pin Definitions
4. MG9072 Chip
The MG9072 is an enclosure
management chip that supports
the SES-2 controller and SES-2
protocols.
2. I
2
C Connectors
The I
2
C connectors, designated
JP37 and JP95, are used to
monitor HDD activity and status.
See the table on the right for pin
definitions.
1. Upgrade Connector
T h e u p g r a d e c o n n e c t o r,
designated JP69, is used for
m a n u f a c t u r e r ' s d i a g n o s t i c
purposes only.
3. Sideband Headers
The sideband headers are
designated JP66 and JP68. For
SES-2 to work properly, you must
connect an 8-pin sideband cable.
See the table to the right for pin
definitions.
Note:
SGPIO is the default setting
for this backplane.
I
2
C Connector
Pin#
Definition
1
Data
2
Ground
3
Clock
4
No Connection
Sideband Headers
Pin#
Definition
Pin#
Definition
2
SGPIO: SDIN
I2C: Backplane
Addressing (SB5)
1
Controller ID (SB6)
4
SGPIO: SDOUT
I2C: Reset (SB4)
3
GND (SB2)
6
GND (SB3)
5
SGPIO: SLOAD
I2C:SDA (SB1)
8
Backplane ID (SB7)
7
SGPIO: SCLOCK
I2C:SCL (SB0)
10
NC
9
NC
NC = No Connection