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PCI Bus Interface Signals 4-5
4.1 PCI Bus Interface Signals
The PCI signal definitions are organized into the following functional
groups: Power and Ground Signals, System Signals, Address and Data
Signals, Interface Control Signals, Arbitration Signals, and Error
Reporting Signals.
4.1.1 System Signals
Table 4.2 describes the System Signals group.
Table 4.2 System Signals
Name Pin No. Type Description
CLK 80 I Clock provides timing for all transactions on the PCI bus and is an input to
every PCI device. All other PCI signals are sampled on the rising edge of
CLK, and other timing parameters are defined with respect to this edge.
Clock can optionally serve as the SCSI core clock, but this may effect fast
SCSI transfer rates.
RST/ 79 I Reset forces the PCI sequencer of each device to a known state. All T/S
and S/T/S signals are forced to a high impedance state, and all internal logic
is reset. The RST/ input is synchronized internally to the rising edge of CLK.
The CLK input must be active while RST/ is active to properly reset the
device.