Conventional Hardware Specifications
These specifications represent the most common version of PCI used in normal PCs.
- 33.33 MHz clock with synchronous transfers
- Peak transfer rate of 133 MB/s (133 megabytes per second) for 32-bit bus width (33.33 MHz × 32 bits ÷ 8 bits/byte = 133 MB/s)
- 32-bit bus width
- 32- or 64-bit memory address space (4 gigabytes or 16 exabytes)
- 32-bit I/O port space
- 256-byte (per device) configuration space
- 5-volt signaling
- Reflected-wave switching
The PCI specification also provides options for 3.3 V signaling, 64-bit bus width, and 66 MHz clocking, but these are not commonly encountered outside of PCI-X support on server motherboards.
The PCI bus arbiter performs bus arbitration among multiple masters on the PCI bus. Any number of bus masters can reside on the PCI bus, as well as requests for the bus. One pair of request and grant signals is dedicated to each bus master.
Read more about this topic: Conventional PCI
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