Datasheet
Functional Description
128 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
Table 3-37. Multi-activity LED Message Type
Byte Description
3-2 Value (VAL): This field describes the state of each LED for a particular location. There are three
LEDs that may be supported by the HBA. Each LED has 3 bits of control.
LED values are:
000b – LED shall be off
001b – LED shall be solid on as perceived by human eye
All other values reserved
The LED bit locations are:
Bits 2:0 – Activity LED (may be driven by hardware)
Bits 5:3 – Vendor Specific LED (such as locate)
Bits 8:6 - Vendor Specific LED (such as fault)
Bits 15:9 – Reserved
Vendor specific message is:
Bit 3:0 – Vendor Specific Pattern
Bit 15:4 – Reserved
Note: If Activity LED Hardware Driven (ATTR.ALHD) bit is set, host will output the hardware LED
value sampled internally and will ignore software written activity value on bit [2:0]. Since
Intel® Xeon® Processor D-1500 Product Family Enclosure Management does not support
port multiplier based LED message, the LED message will be generated independently
based on respective port’s operation activity. Vendor specific LED values Locate (Bits 5:3)
and Fault (Bits 8:6) always are driven by software.
1 Port Multiplier Information: Specifies slot specific information related to Port Multiplier.
Bits 3:0 specify the Port Multiplier port number for the slot that requires the status update. If a Port
Multiplier is not attached to the device in the affected slot, the Port Multiplier port number shall be
'0'. Bits 7:4 are reserved. Intel® Xeon® Processor D-1500 Product Family does not support LED
messages for devices behind a Port MUltiplier. This byte should be 0.
0 HBA Information: Specifies slot specific information related to the HBA.
Bits 4:0 – HBA port number for the slot that requires the status update.
Bit 5 – If set to '1', value is a vendor specific message that applies to the entire enclosure. If cleared
to '0', value applies to the port specified in bits 4:0.
Bits 7:6 – Reserved