Table of Contents
xxviii MIPS R4000 Microprocessor User's Manual
16
Error Checking and Correcting
Error Checking in the Processor.............................................................................408
Types of Error Checking..................................................................................... 408
Parity Error Detection..................................................................................... 408
SECDED ECC Code.........................................................................................409
Error Checking Operation .................................................................................. 412
System Interface............................................................................................... 412
Secondary Cache Data Bus.............................................................................412
System Interface and Secondary Cache Data Bus.......................................412
Secondary Cache Tag Bus...............................................................................413
System Interface Command Bus ...................................................................413
SECDED ECC Matrices for Data and Tag Buses............................................. 414
ECC Check Bits.....................................................................................................414
Data ECC Generation..........................................................................................415
Detecting Data Transmission Errors.................................................................418
Single Data Bit ECC Error ..............................................................................420
Single Check Bit ECC Error............................................................................421
Double Data Bit ECC Errors........................................................................... 422
Three Data Bit ECC Errors .............................................................................423
Four Data Bit ECC Errors ............................................................................... 424
Tag ECC Generation............................................................................................425
Summary of ECC Operations.............................................................................426
R4400 Master/Checker Mode.................................................................................430
Connecting a System in Lock Step ....................................................................431
Master-Listener Configuration ..........................................................................432
Cross-Coupled Checking Configuration..........................................................433
Fault Detection .....................................................................................................435
Reset Operation....................................................................................................436
Fault History.........................................................................................................436
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