RTEMS Intel i960 Applications Supplement
The maximum period with interrupts disabled within RTEMS is less than 2.5 microseconds including the instructions which disable and re-enable interrupts. The time required for the i960CA to generate an interrupt using the sysctl instruction, vectoring to an interrupt handler, and for the RTEMS entry overhead before invoking the user's interrupt handler are a total of 37 microseconds. These combine to yield a worst case interrupt latency of less than 2.5 + 37 microseconds. [NOTE: The maximum period with interrupts disabled within RTEMS was last calculated for Release 3.2.1.]
It should be noted again that the maximum period with interrupts disabled within RTEMS is hand-timed. The interrupt vector and entry overhead time was generated on the Cyclone CVME961 benchmark platform using the sysctl instruction as the interrupt source.
RTEMS Intel i960 Applications Supplement
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