Xilinx MicroBlaze Reference Manual page 128

The redundant MicroBlaze processors are functionally identical, except for debug logic and
associated signals.The outputs from the master MicroBlaze core drive the peripherals in the
system. The slave MicroBlaze core only has inputs connected; all outputs are left open.
The system contains the basic building block for designing a complete fault tolerant
application, where one or more additional blocks must be added to provide redundancy.
This use case is illustrated in the following figure.
X-Ref Target - Figure 2-42
DLMB
Bram Controller
BRAM
ILMB
Bram Controller
MicroBlaze
Debug Module
Inputs
MicroBlaze Processor Reference Guide
UG984 (v2018.2) June 21, 2018
C_LOCKSTEP_SLAVE=0
MicroBlaze
Master
Lockstep_Out
Debug
Debug
Lockstep_Out
MicroBlaze
Slave
C_LOCKSTEP_SLAVE=1
Figure 2-42: Lockstep Error Detection Application
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Chapter 2: MicroBlaze Architecture
Error Reset
Outputs
Inputs
Comparator
Inputs
Send Feedback
I/O Interfaces
External
Memory
Interfaces
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