Chapter 16
430 MIPS R4000 Microprocessor User's Manual
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 00
2
. 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.
SCMasterMd
(Bit 42)
SIMasterMd
(Bit 18)
Mode
00
Complete Master
(required for single-chip operation)
11
Complete Listener
(paired with Complete Master)
10
System Interface Master
(SIMaster)
01
Secondary Cache Master
(SCMaster, paired with SIMaster)
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