參數(shù)資料
型號： 82815EM
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 28/163頁
文件大小： 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
28
Datasheet
2.3.6.
AGP C3 support Signals
The following pin is associated with ACPI C3 support.
Signal Name
Type
Description
AGPBUSY#
OD
CMOS
AGP Bus Busy:
This signal is generated either by the AGP Graphics Chip in AGP mode or by the
GMCH2-M in graphics mode, but not by both. This is an input to the ICH2-M.
In AGP mode,
Asserted (active low): When asserted, AGPBUSY# indicates that the AGP
device is currently busy and requests that the system not transition to the
C3 state. However, assertion of AGPBUSY# does not guarantee that the
system will not enter the C3 state or perform an Intel
SpeedStep
technology transition. If system is in C3 state, then the assertion of
AGPBUSY# is used to request that the system exit from the C3 state.
The AGP GC must assert AGPBUSY# whenever the AGP GC has a
pending request to use the AGP interface. The AGP GC must assert
AGPBUSY# regardless of which protocol it intends to use on the AGP
interface: SBA, PIPE#, or PCI.
AGPBUSY# may only be asserted by the AGP GC when AGPBUSY# is in
the D0 state and should not be asserted in the D1, D2, or D3 states.
Deasserted (high): When deasserted, AGPBUSY# indicates that the AGP
device is not busy and has no need to use the AGP interface.
In Graphics mode,
Asserted (active low): When asserted, AGPBUSY# indicates the internal
graphics unit is requesting snoop or having interrupt request to be serviced.
Therefore, it requests that the system not transition to the C3 state.
However, assertion of AGPBUSY# does not guarantee that the system will
not enter the C3 state or perform an Intel
SpeedStep technology
transition. If system is in C3 state, then the assertion of AGPBUSY# is
used to request that the system exit from the C3 state.
Deasserted (high): When deasserted, AGPBUSY# indicates the internal graphics
unit has no pending snoop request nor graphics interrupt request.
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