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Hard Disk Drive Bays
inserted, the power control waits a small amount of time for the drive to be fully seated,
and then applies power with a controlled power ramp.
•
If the system power is on, the LVD SCSI backplane immediately powers off a drive slot
when it detects that a drive has been removed. This prevents possible damage to the
drive when it is partially removed and re-inserted while full power is available, and
disruption of the entire SCSI array from possible sags in supply voltage and resultant
current spikes.
5.1.2
SCSI Interface
The GEM359 controller supports LVD SCSI operation through 8-bit asynchronous SCSI data
transfers.
2
5.1.2.1
I
C Serial Bus Interface
The GEM359 supports two independent I
value readings to be returned to the host. The Intelligent Platform Management Bus (IPMB) is
2
supported through I
C port 1.
5.1.2.2
Temperature Sensor
The SCSI HSBP provides a temperature sensor with an over-temperature detector. The host
can query the backplane at any time to read the temperature. The host can program both the
temperature alarm threshold and the temperature at which the alarm condition goes away.
5.1.2.3
Serial EEPROM
The SCSI HSBP provides an Atmel* 24C02 or equivalent serial EEPROM for storing FRU
information. The 24C02 EEPROM provides 2048 bits of serial electrically erasable and
programmable read-only memory.
5.1.3
External Memory Device
The SCSI HSBP contains a non-volatile 16K Top Boot Block, 4Mbit Flash memory device that
stores the configuration data and operating firmware executed by the GEM359 controller's
internal CPU.
5.1.4
Hot Swap Power Controller
The SCSI HSBP provides a Texas Instrument* TPS2320 or equivalent, Dual Channel Hot Swap
Power Controller with independent circuit breaker support. The controller uses external N-
channel MOSFETs as high-side switches for 5V and 12V and supports the following features:
overcurrent protection (OCP), inrush-current control, and electrostatic discharge protection.
The controller is housed in a 16-pin TSSOP package.
5.1.5
SCSI Drive Connectors
The SCSI HSBP provides SCA2 connectors for hot swappable drives with support up to the
Ultra-320 LVD transfer rate. The HSBP only supports LVD mode, and not SE or HVD mode.
The HSBP provides one 68-pin SCSI connector to cable back to the host system.
54
Intel® Server Chassis SC5300 5U Kit TPS
2
C interface ports. This enables actual temperature
Revision 1.31
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