Its aperiodic functionality though ensures a nanosecond level of accuracy. The higher precision is afforded by the HPET’s higher frequency of at least 10 MHz, which gives it a granularity of 1 microsecond or less. By allowing the system timer to run at a much lower frequency, this feature improves system performance and in mobile systems, extends battery life. This allows the application to achieve much greater precision without the need for the system timer to actually issue the clock interrupts at the frequency required to achieve that precision. The aperiodic functionality allows applications to issue commands “ out of sync” with the system timer. High-definition video playback, for example, requires a timing resolution of 1 millisecond to decode and synchronize the video frames and audio streams. The HPET is also designed to provide aperiodic functionality and higher precision, both necessary to support the tighter timing requirements of multimedia and other time-sensitive applications. The HPET was originally called the Multimedia Timer (MM Timer) but they changed it to its current name to avoid confusion with a Microsoft DirectX timer of the same name, as well as to better describe the timer. the Advanced Programmable Interrupt Controller (APIC) timer and.the 8254 Programmable Interval Timer (PIT),.The HPET, short for High Precision Event Timer, is a new system timer developed by Intel and Microsoft to replace the four system timers currently in use : HPET Support must be enabled for this BIOS option to be active. The HPET Mode BIOS option is linked to the HPET Support BIOS option.
#AMADEUS PRO IN 32 BIT MODE WINDOWS#
Windows XP), then you can select the 64-Bit Mode. If the 64-bit operating system supports HPET while the 32-bit operating system does not (e.g. If you are dual-booting between a 64-bit operating system and a 32-bit operating system and both support the HPET, select the 32-Bit Mode. If you are using a 32-bit operating system, you should select the 32-Bit Mode. There is no harm in selecting the 32-Bit Mode although it will mean a potential reduction in counter resolution and/or functionality.
#AMADEUS PRO IN 32 BIT MODE FULL#
If you are using a 64-bit operating system, you should select the 64-Bit Mode so that the operating system and 64-bit applications can make full use of the HPET’s 64-bit registers. This allows proper operation when used with a 32-bit operating system. Setting HPET Mode to the 32-Bit Mode forces the HPET’s 64-bit registers to run in the 32-bit mode. Setting HPET Mode to the 64-Bit Mode allows the 64-bit operating systems and applications to make full use of the HPET’s 64-bit registers. This is where the HPET Mode BIOS option comes in. Some HPETs have 64-bits wide registers which can also run in the 32-bit mode. The HPET, short for High Precision Event Timer, is a new system timer developed by Intel and Microsoft to replace the four system timers currently in use. The HPET Mode BIOS option is linked to the HPET Support BIOS option.
Common Options : 64-Bit Mode, 32-Bit Mode
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