Arm
®
CoreLink™ GIC-600AE Generic Interrupt Controller
Technical Reference Manual
Document ID: 101206_0003_04_en
Issue: 04
Functional Safety
Figure 6-16: Transient fault on the qreqn signal
63 62 61 63
Error
Count
QREQn_chk
QREQn
clk
60 59
QREQn_int
The following figure shows how a transient fault on the qreqn_chk signal is filtered.
Figure 6-17: Transient fault on qreqn_chk signal
63 62 63
Error
Count
QREQn_chk
QREQn
clk
QREQn_int
The output of the filtering logic, the qreqn_int signal, does not assert. The figures depict a version
of the qreqn and qreqn_chk signals after they pass synchronizer cells. The counter depicts the
operation of the SAF detector. In this example, the SAF detector is set to a value of 63 whenever
the qreqn and qreqn_chk signals are the same polarity. If it detects a polarity difference between
the qreqn and qreqn_chk signals, it starts counting down. If the counter reaches zero, it flags an
error.
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