LSI 53C810A User Manual
4-8
Signal Descriptions
4.1.4 Arbitration Signals
describes the Arbitration Signals group.
4.1.5 Error Reporting Signals
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.
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.
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.
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.
errors.