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)： 24/163頁
文件大?。?/td> 1049K
代理商： 82815EM
Intel
82815EM GMCH
R
24
Datasheet
2.3.2.
AGP Flow Control Signals
Signal Name
Type
Description
RBF#
I
AGP
Read Buffer Full
During PIPE# and SBA Operation
: Read buffer full indicates if the master is ready
to accept previously requested low priority read data. When RBF# is asserted the
GMCH2-M is not allowed to initiate the return low priority read data. That is, the
GMCH2-M can finish returning the data for the request currently being serviced,
however it cannot begin returning data for the next request. RBF# is only sampled
at the beginning of a cycle.
If the AGP master is always ready to accept return read data then it is not required
to implement this signal.
During FRAME# Operation:
This signal is not used during FRAME# operation.
WBF#
GMCK
I
AGP
I/OD
CMOS
Write-Buffer Full
During PIPE# and SBA Operation
: Write buffer full indicates if the master is ready
to accept Fast Write data from the GMCH2-M.
Intel
815EM chipset does not
support the use of AGP Fast Writes.
If the AGP master is always ready to accept fast write data then it is not required to
implement this signal.
During FRAME# Operation:
This signal is not used during FRAME# operation.
GMBus
: When configured by register GMBUS[2:0], GMCK becomes a bidirectional
clock signal between master GMCH2-M and slave VCH.
2.3.3.
AGP Status Signals
Signal Name
Type
Description
ST[2:0]
O
AGP
Status Bus
During PIPE# and SBA Operation:
Provides information from the arbiter to a AGP
Master on what it may do. ST[2:0] only have meaning to the master when its GNT#
is asserted. When GNT# is deasserted these signals have no meaning and must be
ignored. Refer to the AGP Interface Specificaiton revision 2.0 for further explanation
of the ST[2:0] values and their meanings.
During FRAME# Operation:
These signals are not used during FRAME# based
operation; except that a ‘111’ indicates that the master may begin a FRAME#
transaction.
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