3Led Message Type; Multi-Activity Led Message Type - Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet

The SAF-TE, SES-2, and SGPIO message formats are defined in the corresponding
specifications, respectively. The LED message type is defined in
the responsibility of software to ensure the content of the message format is correct. If
the message type is not programmed as 'LED' for this controller, the controller shall not
take any action to update its LEDs. Note that for LED message type, the message size
is always consisted of 4 bytes.
5.16.12.3 LED Message Type
The LED message type specifies the status of up to three LEDs. Typically, the usage for
these LEDs is activity, fault, and locate. Not all implementations necessarily contain all
LEDs (for example, some implementations may not have a locate LED). The message
identifies the HBA port number and the Port Multiplier port number that the slot status
applies to. If a Port Multiplier is not in use with a particular device, the Port Multiplier
port number shall be '0'. The format of the LED message type is defined in
The LEDs shall retain their values until there is a following update for that particular
slot.
Table 5-41. Multi-activity LED message type
Byte
3-2
1
0
198
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 the PCH 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.
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. The PCH does not support LED
messages for devices behind a Port MUltiplier. This byte should be 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
Section
Description
Functional Description
5.16.12.3. It is
Table 5-41.
Datasheet