82G33 datasheet(166/437 Pages) INTEL

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DRAM Controller Registers (D0:F0)

166

Datasheet

Bit

Access &

Default

Description

RS/WC

In Use (IU): Software semaphore bit.

After a full MCH RESET, a read to this bit returns a 0.

After the first read, subsequent reads will return a 1.

A write of a 1 to this bit will reset the next read value to 0.

Writing a 0 to this bit has no effect.

Software can poll this bit until it reads a 0, and will then own the

usage of the thermal sensor.

This bit has no other effect on the hardware, and is only used as a

semaphore among various independent software threads that may

need to use the thermal sensor.

Software that reads this register but does not intend to claim

exclusive access of the thermal sensor must write a one to this bit if it

reads a 0, in order to allow other software threads to claim it.

See also THERM3 bit 7 and IUB, which are independent additional

semaphore bits.

5.2.43

TSC2—Thermal Sensor Control 2

B/D/F/Type:

0/0/0/MCHBAR

Address Offset:

CD9h

Default Value:

00h

Access:

RW/L, RO

Size:

8 bits

This register controls the operation of the thermal sensor. All bits in this register are

reset to their defaults by CL_PWROK.

Bit

Access &

Default

Description

7:4

Reserved

3:0

RW/L

Thermometer Mode Enable and Rate (TE): If analog thermal

sensor mode is not enabled by setting these bits to 0000b, these bits

enable the thermometer mode functions and set the Thermometer

controller rate.

When the Thermometer mode is disabled and TSC1[TSE] =enabled,

the analog sensor mode should be fully functional. In the analog

sensor mode, the Catastrophic trip is functional, and the Hot trip is

functional at the offset below the catastrophic programmed into

TSC2[CHO]. The other trip points are not functional in this mode.

When Thermometer mode is enabled, all the trip points (Catastrophic,

Hot, Aux0) will all operate using the programmed trip points and

Thermometer mode rate.

Note: When disabling the Thermometer mode while thermometer

running, the Thermometer mode controller will finish the

current cycle.

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