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| 型號(hào)： | FW82815 |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項(xiàng)-數(shù)據(jù)表參考 |
| 文件頁(yè)數(shù)： | 25/172頁(yè) |
| 文件大?。?/td> | 795K |
| 代理商： | FW82815 |
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82815 GMCH
R
Datasheet
25
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
GMCH is not allowed to initiate the return low priority read data. That is, the GMCH
can finish returning the data for the request currently being serviced, however it can
not 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 AGP FRAME#
operation.
WBF#
I
AGP
Write-Buffer Full.
During PIPE# and SBA Operation.
Write bufffer full indicates if the master is ready
to accept Fast Write data from the GMCH. When WBF# is asserted the GMCH is
not allowed to drive Fast Write data to the AGP master. WBF# is only sampled at
the beginning of a cycle.
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 AGP FRAME#
operation.
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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