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4-8 Signal Descriptions
4.1.4 Arbitration Signals
Table 4.5 describes the Arbitration Signals group.
4.1.5 Error Reporting Signals
Table 4.6 describes the Error Reporting Signals group.
Table 4.5 Arbitration Signals
Name Pin No. Type Strength Description
REQ/ 200, A4 O 16 mA PCI Request indicates to the system arbiter that this agent
desires use of the PCI bus. This is a point-to-point signal.
Every master has its own REQ/ signal.
GNT/ 199, B5 I N/A Grant indicates to the agent that access to the PCI bus has
been granted. This is a point-to-point signal. Every master
has its own GNT/ signal.
Table 4.6 Error Reporting Signals
Name Pin No. Type Description
PERR/ 19 S/T/S Parity Error may be pulsed active by an agent that detects a data
parity error. PERR/ can be used by any agent to signal data corruption.
However, on detection of a PERR/ pulse, the central resource may
generate a nonmaskable interrupt to the host CPU, which often implies
the system is unable to continue operation once error processing is
complete.
SERR/ 78 O System Error is an open drain output used to report address parity
errors.