Bus Protocols
The essence of any bus is the set of rules by which data moves between devices.
This set of rules is called a “protocol.
- PCI (Peripheral Component Interconnect)
- SCSI (Small computer System Interconnect)
PCI:
-PCI bus is often referred as “local” bus which is designed to interface with different
microprocessor families, main memory, and a very wide range of I/O devices.
It can support either 32- bit or 64- bit data transfer with maximum clock rate of 66
MHZ and allows a data transfer rate up to 524 MB/s.
Basic transfer mode is burst transfer and it uses multiplexed address and data lines.
PCI bus architecture is a processor independent.
PCI bus is basically intended for attaching IO devices to a computer, but it has many
of the characteristics of a high performance system bus.
- PCI bus controller communicates independently with IO devices via PCI bus and
communicates with memory through system bus.
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