Intel B940 Datasheet Page 99

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Datasheet, Volume 2 99
Processor Configuration Registers
2.8.46 HWTHROTCTRL1—Hardware Throttle Control 1 Register
B/D/F/Type: 0/0/0/MCHBAR
Address Offset: 101Ch
Reset Value: 00h
Access: RW-L, RO, RW-O
Bit Attr
Reset
Value
Description
7RW-L 0b
Internal Thermal Hardware Throttling Enable (ITHTE)
This bit is a master enable for internal thermal sensor-based hardware
throttling:
0 = Hardware actions using the internal thermal sensor are disabled.
1 = Hardware actions using the internal thermal sensor are enabled.
6RO 0bReserved
5RW-L 0b
Use Direct Catastrophic Trip for HOC (UDCTHOC)
1 = Catastrophic trip output of DTS circuit is used to control THRMTRIP#.
0 = Thermometer comparison to catastrophic trip value is used to control
THRMTRIP#.
4RW-L 0b
Throttle Zone Selection (TZS)
This bit determines what temperature zones will enable autothrottling. This
register applies to internal thermal sensor throttling. Lockable by bit 0 of this
register.
0 = Hot, Aux2, and Catastrophic.
1 = Hot and Catastrophic.
3RW-L 0b
Halt on Catastrophic (HOC)
When this bit is set, THRMTRIP# is asserted on catastrophic trip to bring the
platform down. A system reboot is required to bring the system out of a halt
from the thermal sensor. Once the catastrophic trip point is reached,
THRMTRIP# will stay asserted even if the catastrophic trip de-asserts before
the platform is shut down.
2:1 RO 00b Reserved
0RW-O 0b
Hardware Throttling Lock Bit (HTL)
This bit locks bits 7:1 of this register. When this bit is set to a one, the
register bits are locked. It may only be set to a 0 by a hardware reset.
Writing a 0 to this bit has no effect.
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