Datasheet

Features
Dual-Core Intel
®
Xeon
®
Processor 7000 Series Datasheet 85
alarm condition persists). If the SM_ALERT# signal is enabled via the Thermal Sensor
Configuration Register and a thermal diode threshold is exceeded, an alert will be sent to the
platform via the SM_ALERT# signal.
7.4.6.4 Configuration Register
The Configuration Register controls several functions of the temperature sensor such as ALERT#
masking, stand-by mode, and others. Table 7-14 and Table 7-11 shows the bit definitions of the
Configuration Registers.
Table 7-12. SMBus Thermal Sensor Status Register 1
Bit Name Reset State Function
7 (MSB) BUSY N/A If set, indicates that the device’s analog to digital
converter is busy.
6 RESERVED RESERVED Reserved for future use.
5 RESERVED RESERVED Reserved for future use.
4 R1HIGH 0 If set, indicates the processor core 1 thermal diode high
temperature alarm has activated.
3 R1LOW 0 If set, indicates the processor core 1 thermal diode low
temperature alarm has activated.
2 R1OPEN 0 If set, indicates an open fault in the connection to the
processor core 1 diode.
1 RESERVED RESERVED Reserved for future use.
0 (LSB) RESERVED RESERVED Reserved for future use.
Table 7-13. SMBus Thermal Sensor Status Register 2
Bit Name Reset State Function
7 (MSB) RESERVED RESERVED Reserved for future use.
6 RESERVED RESERVED Reserved for future use.
5 RESERVED RESERVED Reserved for future use.
4 R2HIGH 0 If set, indicates the processor core 2 thermal diode high
temperature alarm has activated.
3 R2LOW 0 If set, indicates the processor core 2 thermal diode low
temperature alarm has activated.
2 R2OPEN 0 If set, indicates an open fault in the connection to the
processor core 2 diode.
1 RESERVED RESERVED Reserved for future use.
0 (LSB) ALERT 0 If set, indicates the ALERT pin has been asserted low.
This bit gets reset when the ALERT output gets reset.
Table 7-14. SMBus Thermal Sensor Configuration Register (Sheet 1 of 2)
Bit Name Reset State Function
7 (MSB) MASK 0 Mask SM_ALERT# bit. Clear the bit to allow interrupts
via SM_ALERT# and allow the thermal sensor to
respond to the ARA command when an alarm is active.
Set the bit to disable interrupt mode. The bit is not used
to clear the state of the SM_ALERT# output. An ARA
command may not be recognized if the mask is
enabled.