Intel SR6850HW4 - Manual (Page 87)

Intel® Server Platform SR6850HW4 TPS SCSI Backplane Board
Revision 1.0
Intel order number D23151-001
75
7.2.3 SCSI Enclosure Management
SCSI enclosure management allows the SCSI Backplane Board to report hot-swap SCSI hard
disk drive status via the SCSI bus. This information is normally consumed by a RAID controller
that supports enclosure management; the optional ROMB accessory supports this feature. The
SCSI enclosure management subsystem consists of a Qlogic GEM359 controller, flash, and
PLD.
PLD
(LC4128V)
LVD SCSI BUS DATA 0..7
LVD SCSI BUS CONTROL
ENCLOSURE
MANAGEMENT
CONTROLLER
(Qlogic* GEM359)
Ad
dres 0..16
THERMAL
SENSOR
(DS75)
RESET
Control
FLASH
FRU
(24C02)
I 2 C
DAT
A
Drive an
d
LED
contr
ol
Figure 31. Enclosure Management Signal Flow Diagram
7.2.3.1 Qlogic GEM359 Enclosure Management Controller
The GEM359s send board and drive information to both the SCSI and IPMB bus. The GEM359s
also act on requests from both the SCSI bus and global I
2 C bus. GEM359s GPIOs send LED
information to the PLD.
7.2.3.2 4-Mb Flash
The GEM359s code is stored in a 4-Megabit FLASH (512K x 8). The FLASH boot block is in the
top 16k of the block. The boot block is write-protected. Non-protected FLASH can be updated
through the IPMB bus.
7.2.3.3 PLD
The PLD governs the SCSI power control circuit and controls the LEDs. The PLD is an In-System
Programmable (ISP) with an 8-pin header connector.