QG82945GSE S LB2R Intel, QG82945GSE S LB2R Datasheet - Page 394

• Manufacturer Part Number: QG82945GSE S LB2R
• Description: GRAPHICS AND MEM CNTRL HUB; No. of Pins: 998; Package / Case: FCBGA; Interface Type: PCI, SATA, USB
• Manufacturer: Intel

Figure 28.
10.7.3
10.7.4
394
CPU
Platform External Sensor
THRMTRIP# Operation
Assertion of the (G)MCH’s THRMTRIP# (Thermal Trip) indicates that its junction
temperature has reached a level beyond which damage may occur. Upon assertion of
THRMTRIP#, the (G)MCH will shut off its internal clocks (thus halting program
execution) in an attempt to reduce the core junction temperature. Once activated,
THRMTRIP# remains latched until RSTIN# is asserted. The (G)MCH THRMTRIP# and
CPU THRMTRIP# signals connect to Intel 82801GBM.
DT (Delta Temperature) in SPD and VTS (Virtual Thermal
Sensor)
DT in SPD (Delta Temperature in SPD) is a system/platform level power/thermal
management feature for memory. As frequency increases, DRAM current/power
increases making it challenging to maintain a safe margin to thermal limits.
DT in SPD stores key temperature rise data and a DRAM maximum T-case data in SPD.
Information on the power consumption and temperature rise for various types of
transactions is stored in the SPD. The (G)MCH configures itself with this information at
boot time. This allows the (G)MCH to perform memory throttling optimized to that
particular DRAM.
DT in SPD makes possible a ‘Virtual Thermal Sensor’ in the (G)MCH, improving upon
the earlier technique of pure bandwidth-based throttling, irrespective of the
characteristics of the DRAM module.
• DDR2 module vendors report in SPD the delta temperature rise parameter and T-
• System adjusts performance based on SPD contents (e.g., via BIOS)
case max
MCH
ICH
ETS
THERM#
TS
Memory
TS
**External Pull-up R is
associated with the voltage
rail of the MCH Input.
R**
Functional Description
SMBdata
SMBclock
V
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