Datasheet

Functional Description
158 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
3.21 Thermal Management
3.21.1 Thermal Sensor
Intel® Xeon® Processor D-1500 Product Family incorporates one on-die Digital
thermal sensor (DTS) for thermal management. The thermal sensor can provide Intel®
Xeon® Processor D-1500 Product Family temperature information to an EC or SIO
device that can be used to determine how to control the fans.
The on-die thermal sensor is placed as close as possible to the hottest on-die location
to reduce thermal gradients and to reduce the error on the sensor trip thresholds. The
thermal sensor trip points may be programmed to generate various interrupts including
SCI, SMI and other General Purpose events.
3.21.1.1 Internal Thermal Sensor Operation
The internal thermal sensor reports four trip points: Aux2, Aux, Hot and Catastrophic
trip points in the order of increasing temperature.
Aux, Aux2 Temperature Trip Points
These trip points may be set dynamically if desired and provides
an interrupt to ACPI (or other software) when it is crossed in
either direction. These auxiliary temperature trip points do not
automatically cause any hardware throttling but may be used by
software to trigger interrupts. This trip point is set below the Hot
temperature trip point and responses are separately
programmable from the hot temperature settings, in order to
Table 3-48. Host Notify Format
Bit Description Driven By Comment
1 Start External Master
8:2 SMB Host Address – 7 bits External Master Always 0001_000
9 Write External Master Always 0
10 ACK (or NACK) Intel® Xeon®
Processor D-1500
Product Family
Intel® Xeon® Processor D-1500 Product
Family NACKs if HOST_NOTIFY_STS is 1
17:11 Device Address – 7 bits External Master Indicates the address of the master; loaded
into the Notify Device Address Register
18 Unused – Always 0 External Master 7-bit-only address; this bit is inserted to
complete the byte
19 ACK Intel® Xeon®
Processor D-1500
Product Family
27:20 Data Byte Low – 8 bits External Master Loaded into the Notify Data Low Byte
Register
28 ACK Intel® Xeon®
Processor D-1500
Product Family
36:29 Data Byte High – 8 bits External Master Loaded into the Notify Data High Byte
Register
37 ACK Intel® Xeon®
Processor D-1500
Product Family
38 Stop External Master