TL32 ETC, TL32 Datasheet - Page 13

• Manufacturer Part Number: TL32
• Description: Real Time System Testing MIT 16.070 Lecture 32
• Manufacturer: ETC

How can a processor check its own status?
• Built-In-Test (BIT)
• CPU testing (done in the background)
• Memory testing
• Watchdog Timers
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– Ongoing diagnostics of the hardware that runs the software
– Interface checks
– Checking for memory corruption due to vibration, power surges,
– Use error detection & recovery schemes (CRC, Hamming Code)
– Counting registers used to ensure that devices are still on line
– CPU resets the timer at regular intervals. Timer overflow indicates
electrostatic discharge, single event upsets, etc.
a problem with the CPU
Fault Tolerance - Checking Hardware Resources