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Pastimes : Dream Machine ( Build your own PC )
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To: Dirk Hente who wrote (212)4/9/1998 9:02:00 PM
From: Zeuspaul  Read Replies (1) of 14778
 
PCI limitations...number of slots..loads

An excerpt, read the entire article at
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>>The hierarchical bus structure does more than free the faster buses from the waits and limitations of the slow ones, it shortens the physical reach of the faster buses and reduces the number of connected devices. Take a look at a PCI motherboard - it's no accident that the PCI chip set is physically near the processor or that the
memory sockets are near them both. The speed of light is the fastest signals propagate along wires, and is no better than (!!!) one nanosecond per foot. Long wires on the motherboard require longer cycles for round trip signaling. Worse, every device on a wire adds capacitance slowing the rise time of the signals and effectively
slowing the signal propagation rate. These physical problems, in practical terms, are the source of the limits on the number of devices you can hang on a PCI bus - the reason motherboards commonly only support three or four PCI cards.

The inherent PCI wire length and signal loading limits mean that, without special measures, you can't have lots of PCI slots on a motherboard, and can't have multiple PCI devices on an adapter card. That's not a realistic restriction though - a server can easily need lots of PCI slots; a dual channel SCSI host adapter needs to
present multiple devices on the bus for a single card slot.<<

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