Intel®
Server System SR1625UR TPS
Hard Disk Drive Support
Revision 1.5
Intel order number E47487-007
53
7.3.2
SAS/SATA Backplane Functional Architecture
The following figure shows the functional blocks of the SAS/SATA backplane.
Figure 35. SAS/SATA Backplane Functional Block Diagram
7.3.2.1
Enclosure Management Controller
The backplane utilizes the features of the Vitesse VSC410 to implement several enclosure
management functions. The chip provides in-band SAF-TE and SES management and utilizes
the following four I
2
C interfaces:
1. I
2
C bus 0 is connected to an EEPROM, which stores configuration and FRU data.
2. I
2
C bus 1 is connected to an LM75 temperature sensor.
3. I
2
C bus 2 is connected to an IPMB bus from the server board.
4. I
2
C bus 3 is connected to the LSISAS1078 SAS controller.
7.3.2.2
Hard Drive Activity and Fault LEDs
The backplanes support an activity/fault LED for each of the hard drive connectors. The LED
will illuminate green for activity or amber for a drive fault. The green activity LED is driven by the
SAS/SATA hard disk drive directly. The amber fault LED is driven by the VSC410*
management controller whenever a fault condition is detected. When the drive is used in a
RAID configuration, the RAID controller has control over the fault LED and it may exhibit
different behavior.
Table 40. Hard Drive LED Function Definitions
Status LED
Definition
Green On
HDD Activity
