5AX
1-7
1.7. What is AGP
The Accelerated Graphics Port (AGP) is a new port on the Host-To-PCI bridge
device that supports an AGP port. The main purpose of the AGP port is to provide
fast access to system memory.
The AGP port can be used either as fast PCI port (32-bits at 66MHz vs. 32-bits at
33MHz) or as an AGP port which supports 2x data -rate, a read queue, and side
band addressing. When the 2x-data rate is used the port can transmit data at
533Mb/sec (66.6*2*4). The read-queue can be used to pipeline reads – removing
the effects of the reads-latency. Side band addressing can be used to transmit the
data address on a separate line in order to further speed the transaction.
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