Datasheet

Signal Description
R
34 Datasheet
2.3.2 AGP Flow Control Signals
Table 6. AGP Flow Control Signals
Signal Name Type Description
GRBF# I
AGP
Read Buffer Full: Read buffer full indicates if the master is ready to
accept previously requested low priority read data. When RBF# is
asserted the GMCH/MCH is not allowed to initiate the return low priority
read data. That is, the GMCH/MCH can 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.
GWBF# I
AGP
Write-Buffer Full: indicates if the master is ready to accept Fast Write
data from the GMCH/MCH. When WBF# is asserted the GMCH/MCH 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.