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Chapter 5 RAS Function
Computer module C2PU37 User’s Manual
36
5.1 RAS Function Overview
The RAS hardware and software provide the following functions.
5.1.1 RAS Hardware
Internal diagnosis Circuit that detects internal abnormal conditions.
• WDT monitoring
• DRAM ECC error detection
• CPU temperature/CPU peripheral temperature rise detection
• Power voltage drop detection
• C2 built-in Battery failure detection
Power ON/OFF function OFF detection of an input power supply, and control of a power
supply.
Reset function The function reset at the time of abnormalities
• Compulsive initialization switch (INZ switch)
• Compulsive hardware reset switch (RST switch)
Interrupt output function Non-maskable interrupts (NMI) and maskable interrupts (MI) are
available.
NMI: Power off, WDT, initialize switch control
MI: CPU peripheral temperature rise, interval timer
(MI can be enabled/disabled by software)
RAS memory function Equipped with battery backed RAS memory (64K bytes) to save
information while running.
• Saving of error information
• Saving of user information
5.1.2 RAS Support Software
This section provides a general description of the RAS support software. Refer to the
"Computer module C2/C3 Windows User’s Manual (6F8C0894)" for more information
concerning RAS function software processing.
The Windows version C2 is shipped with the RAS support software installed.
The RAS support software consists of RAS hardware drivers and RAS software libraries and
there are two ways to use it.
From the RAS windows It can be used simply by registering the RAS window parameter
during installation.
From the user program Used by creating a user application program using RAS
commands in VC (Visual C++) or VB (Visual Basic) for the
specific purpose.
Sufficient knowledge of the hardware functions is necessary to
create the program.