G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.86
G06F 1/04 (2006.01) G06F 9/00 (2006.01) G06F 13/00 (2006.01) G06F 13/26 (2006.01) G06F 15/00 (2006.01)
Patent
CA 1099820
ABSTRACT OF THE DISCLOSURE An input/output system includes a plurality of modules and a system interface unit having a plurality of ports, each of which connects to a different one of the modules. The plurality of modules includes at least one processor and one memory module. The system interface unit includes a timer unit and a priority network for processing processor interrupt requests on a priority basis. The priority net- work connects to a register for storing coded priority level signals to be assigned to the different types of interrupt requests. The register is conditioned to store a low priority level for timer interrupts. The timer unit includes a preset register, an interval counter and a rollover counter. At the completion of each time interval, the interval counter is loaded automatically from the preset register and counting is continued. Simultaneously, the interval counter conditions the rollover counter to store a count registering the total number of completed intervals counted. The processor re- sponds to a timer interrupt request by a special command which can only selectively clear the rollover counter to ZEROS when the interval counter is not in the process of completing another interval. -1-
288391
Calle Jaime
Griswold Victor M.
Twibell Jerome J.
Honeywell Information Systems Inc.
Smart & Biggar
LandOfFree
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