LSI 53C875A technical manual Arbitration Signals, Error Reporting Signals

3.3.4	Arbitration Signals
				Table 3.5 describes Arbitration signals.
Table 3.5		Arbitration Signals
Name	PQFP		BGA		Type	Strength	Description
REQ/	148		E6		O	8 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/	147		D6		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.

3.3.5 Error Reporting Signals

Table 3.6 describes the Error Reporting signals.

Table 3.6		Error Reporting Signals
Name	PQFP		BGA	Type	Strength	Description
PERR/	24		H2	S/T/	8 mA PCI	Parity Error may be pulsed active by an agent that
				S		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/	143		E7	O	8 mA PCI	System Error is an open drain output used to report
						address parity errors as well as critical errors other than
						parity.

PCI Bus Interface Signals 3-7