4 arbitration signals, Table 3.5 arbitration signals, 5 error reporting signals – Avago Technologies LSI53C825AE User Manual
Page 79: Table 3.6 error reporting signals, Arbitration signals, Error reporting signals, Error, Reporting signals
PCI Bus Interface Signals
3-9
3.1.4 Arbitration Signals
describes the signals for the Arbitration Signals group:
3.1.5 Error Reporting Signals
describes the signals for the Error Reporting Signals group:
Table 3.5
Arbitration Signals
Name
Pin No. Type Description
REQ/
148
O
Request indicates to the arbiter that this agent desires use of the PCI bus.
This is a point-to-point signal. Every master has its own REQ/.
GNT/
147
I
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/.
Table 3.6
Error Reporting Signals
Name
Pin No.
Type
Description
PERR/
24
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 corruptions.
SERR/
143
O
System Error is an open drain output pin used to report address parity
errors. 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.