B-5
Appendix B: BPN-SAS-825TQ Backplane Specifications
#8 and #9 Sideband Headers
The sideband headers are designated JP51
and JP52. For SES-2 to work properly, you
must connect an 8-pin sideband cable. See
the table to the right for pin definitions.
Sideband Headers
Pin # Definition
Pin # Definition
2
SGPIO:
SDIN;
I
2
C:
Backplane
Addressing
1
Controller
ID (SB6)
4
SGPIO:
SDOUT;
I
2
C: Reset
3
GND (SB2)
6
GND (SB3)
5
SGPIO:
SLOAD;
I
2
C: SDA
8
Backplane
ID (SB7)
7
SGPIO:
SCLOCK;
1
2
C: SCL
10
No Connec-
tion
9
No Connec-
tion
#12 to #19 SAS Ports
The SAS ports are used to connect the SAS
drive cables. The eight ports are designated
#0 - #7. Each port is also compatible with
SATA drives.
#10 MG9072 Chip
The MG9072 is an enclosure management
chip that supports the SES-2 controller and
SES-2 protocols.
#11 Upgrade Header
The upgrade header is designated JP46 and is
used for manufacturing purposes only.