ARM CoreLink GIC-600AE

Arm
®
CoreLink™ GIC-600AE Generic Interrupt Controller
Technical Reference Manual
Document ID: 101206_0003_04_en
Issue: 04
Functional Safety
6.11.3 PPI and SPI stuck-at faults
The following figure shows the case where an spi signal is stuck for 16 cycles, prompting the FMU
to flag a fault.
Figure 6-28: Stuck-at-one fault on spi signal
15
Error
Count
spi_chk
spi
clk
spi_int
14 13 12 11 2 1 0
The spi_int signal has inverse polarity.
6.11.4 PPI and SPI configuration parameters
The following parameters apply to PPI and SPI interrupt interface protection.
•
fusa_spi_prot
•
fusa_ppi_prot
For more information about these parameters, see Configuration options in the Arm
®
CoreLink
™
GIC-600AE Generic Interrupt Controller Configuration and Integration Manual.
6.12 Systematic fault watchdog protection
The GIC-600AE contains a watchdog-based PING/ACK mechanism that guards against systematic
errors on the interconnect.
The Distributor pings each GIC block in a round-robin sequence and waits for a response. If a
response is not received within a programmable timeout window, a fault is reported. This PING/
ACK mechanism can guard against:
•
Lockup on the interconnect that connects the GIC blocks.
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