Chapter 2. CPU Features & Specifications
90
PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual
GFK-2222AD
Error Checking and Correction, IC698CRE030 and IC698CRE040
Redundancy CPUs are shipped with error checking and correction (ECC) enabled. Enabling ECC results in
slightly slower system performance, primarily during power-up, because it uses an extra eight bits that
must be initialized. If you upgrade the firmware on a non-redundancy CPU model to support redundancy,
you must set the ECC jumper to the enabled state as described in the installation instructions provided
with the upgrade kit.
For details on ECC, refer to the
PACSystems Hot Standby CPU Redundancy User Manual
, GFK-2308.
Note:
Multiple Recoverable Memory Error faults may be generated when a single-bit ECC error is
detected. When a single-bit ECC error is detected, the value presented to the
microprocessor is corrected. However, the value stored in RAM is not corrected until the next
time the microprocessor writes to that RAM location.
