Examples of Bus Standards. PCI & AGP. Overview. PCI ( Peripheral Component Interconnect) Technical description Protocol Data transfers Arbitration schemes AGP (Accelerated Graphic Port) Is AGP an attempt to replace PCI? . PCI – technical description. Pin Description
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PCI & AGP
Read and Write operations in the PCI bus
Aside from using the synchronous bus protocol, it follows the out of order bus protocol. AGP is a pipelined bus with the additional feature that the order of returning the data can be different than the order in which the addresses were received.
AGP provides two modes for the graphics controller to directly access texture maps in system memory:
Pipelining –AGP overlaps the memoryor bus access times for a request (“n”) with the issuing of following requests
AGP neither replaces nor diminishes the necessity of PCI in the system. It is physically, logically, and electrically independent of the PCI bus and forms an additional connection point in the system. It is intended for the exclusive use of graphic controllers; all other I/O devices will continue to reside on the PCI bus.