參數(shù)資料
型號: 82845MZ
廠商: INTEL CORP
元件分類: 外設(shè)及接口
英文描述: Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
中文描述: MULTIFUNCTION PERIPHERAL, PBGA593
封裝: 37.50 X 37.50 MM, FCBGA-593
文件頁數(shù): 25/157頁
文件大?。?/td> 1407K
代理商: 82845MZ
Intel
82845MP/82845MZ Chipset-Mobile (MCH-M)
250687-002
Datasheet
25
R
2.4.2.
AGP Flow Control Signals
Table 8. AGP Flow Control Signal Descriptions
Signal Name
Type
Description
RBF#
I
AGP
Read Buffer Full:
Indicates if the master is ready to accept previously requested
low priority read data. When
RBF#
is asserted, the MCH-M is not allowed to initiate
the return of low priority read data. That is, the MCH-M can only finish returning the
data for the request currently being serviced.
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:
indicates if the master is ready to accept Fast Write data from
the MCH-M. When
WBF#
is asserted the MCH-M 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.
2.4.3.
AGP Status Signals
Table 9. AGP Status Signal Descriptions
Signal Name
Type
Description
ST[2:0]
O
AGP
Status:
Provides information from the arbiter to an 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 Specification 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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