LSI 53C810A technical manual Arbitration Signals, Error Reporting Signals

4.1.4	Arbitration Signals
			Table 4.5 describes the Arbitration 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.

4.1.5 Error Reporting Signals

Table 4.6 describes the Error Reporting Signals group.

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.

4-8 Signal Descriptions