5.3 Safety and IEC 60730 Features

Table 5-1. Safety and IEC 60730 Features
Peripheral	Component	Fault/Error/Feature	Requirements for Class B IEC 60730⁽¹⁾	General Safety
PMC	Clock	MCK frequency monitor - MCK out-of-range operation	–	X
		32.768 kHz crystal oscillator frequency monitor - Abnormal frequency deviation	X	X
		Main crystal oscillator failure detector - Crystal failure detection	X	X
System Controller	All	Safety critical peripherals and/or counters are fed by the always-on slow RC oscillator - WDT, RSTC, start-up counters, timeout counters, etc.	–	X
PIOC	I/O lines	Digital I/O - Plausibility check	X	–
ADCC	I/O lines	Analog I/O and ADC converter - Plausibility check	X	–
NAND Flash Controller ECC	Memory	Non-volatile memory - Multiple error detection (2 to 24)	–	X
WDT, RSTC	Watchdog	Watchdog is driven by an internal always on clock - Program counter stuck at faults	X	X
		Watchdog configuration can be locked until the next reset - Errant writes (programming errors, errors introduced by system or hardware failures)	–	X
		Watchdog overflow generates a system reset	X	X
Arm926EJ-S MMU	Memory Management Unit	Arm926EJ-S Memory Management Unit	–	X
MATRIX, AIC, RTC, RTT, RSTC, SHDWC, SDRAM, PMC, PIOC, MPDDRC, SMC, CLASSD, SSC, FLEXCOM, QSPI, TC, I2SMCC, ADC	Peripherals	Configuration, Interrupt Enable/Disable, Control registers can be independently write-protected - Errant writes (programming errors, errors introduced by system or hardware failures)	–	X
AES, TDES, SHA, PIT64B, TC, MPDDRC	Peripherals	Embedded integrity checker with reports in status registers	–	X

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