Lock-step Operation

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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When the Cortex-R5F processors are in the lock-step mode (This Figure), there should be code in the reset handler to ensure that the distributor within the GIC dispatches interrupts only to CPU0. During the lock-step operation, the TCMs that are associated with the redundant processor become available to the lock-step processor. The size of ATCM and BTCM become 128 KB each with BTCM supporting interleaved accesses from processor and AXI slave interface.

Figure 4-5:      TCMs in Lock-step Mode

X-Ref Target - Figure 4-5