Intel® Server Platform SR6850HW4 TPS

SCSI Backplane Board

7.2.3SCSI 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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THERMAL

LVD SCSI BUS DATA 0..7

ENCLOSURE

 

 

 

 

 

 

SENSOR

 

 

 

 

 

 

 

 

 

 

 

 

 

(DS75)

 

MANAGEMENT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROLLER

 

 

 

 

 

 

 

 

 

 

I2C

 

 

 

LVD SCSI BUS CONTROL

(Qlogic* GEM359)

 

 

 

FRU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(24C02)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Addres 0..16

Control

DATA

 

 

 

 

 

RESET

 

 

 

 

 

 

 

FLASH

Drive and LED control

PLD

(LC4128V)

Figure 31. Enclosure Management Signal Flow Diagram

7.2.3.1Qlogic 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 I2C bus. GEM359s GPIOs send LED information to the PLD.

7.2.3.24-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.

7.2.3.3PLD

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.

Revision 1.0

75

 

Intel order number D23151-001