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Politics : Formerly About Advanced Micro Devices

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To: Marco Polo who wrote (60488)	6/4/1999 1:18:00 AM
From: Elmer	Read Replies (2) of 1571694

Re: "I said "bus" not bus. Point-to-point isn't a standard bus, depending on how you look at it. You can't do point-to-point with your current computer, which is how I know you've never overclocked anything. K7 features memory port, similar to AGP as I understand it." It might be valuable to define the difference between a bus and a port. I'm going to take a stab at it but I can't be certain I'm completely correct. First, a bus allows for multiple entities to access it, so there must be an arbitration protocol directly for the bus, a port has no such requirements because it isn't shared. Second, a bus has a different transmission line signature because of the multiple entities that may or may not be attached. For example the PCI bus may have 1-4 or more devices attached. A port is much easier to impedence match because the loading is fixed and does not change with regards to capacitance or length. The K7 system architecture uses processor ports. A different port is required for each processor in a multiprocessor system. The P6 architecture uses a system bus which is shared between 1-4 different processors. EP

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