16.2 -R4400 Master/Checker Mode

16. Error Checking and Correcting

16.2 R4400 Master/Checker Mode

The R4400 processor supports four Master/Checker mode configurations, which are designated by boot-mode bit settings: Complete Master, Complete Listener, System Interface Master, and Secondary Cache Master. The boot-mode bits, SIMasterMd (mode bit 18) and SCMasterMd (mode bit 42), define Master/Checker configurations. Table 16-5 lists the configurations encoded by these bits.

Table 16-5 Boot-Mode Bit Encodings of Master/Checker Modes

For a non-fault tolerant system, these bits must be set to 002. This is the Complete Master mode.

In a fault tolerant system, there are two possible configurations using the Master-Listener and Cross-Coupled modes described in Table 16-5. These are referred to as lock-step configurations, and are described later in this section.

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