Arbitration Signals; Error Reporting Signals - LSI LSI53C875A Technical Manual

3.3.4 Arbitration Signals

Table 3.5

Arbitration Signals

Name PQFP BGA Type Strength Description
REQ/ 148 E6
GNT/ 147 D6

3.3.5 Error Reporting Signals

Table 3.6

Error Reporting Signals

Name PQFP BGA Type
PERR/ 24 H2
SERR/ 143 E7
Table 3.5 describes Arbitration signals.
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.
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 3.6 describes the Error Reporting signals.
Strength Description
S/T/ 8 mA PCI Parity Error may be pulsed active by an agent that
S
O 8 mA PCI System Error is an open drain output used to report
PCI Bus Interface Signals
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.
address parity errors as well as critical errors other than
parity.
3-7