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Confusion is avoided and reliability is improved by simultaneously updating a plurality of status registers under program control.
English (United States)
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Status Register Maintenance
Confusion is avoided and reliability is improved by simultaneously updating a
plurality of status registers under program control.
In order to frequently present an unambiguous image of a machine's status to
a system interface upon request at any given moment, the status registers must
present a consistent indication of machine status. Also provided for are the
automatic setting and resetting of pointer indicators in one status register when
details of machine conditions are presented in, and erased from, other status
registers. A key in providing the above is that sensors and logic for detecting
changes in the state of the machine are not allowed to directly set and reset
indicators in the status registers. Instead, machine state changes are queued in
separate processor status change request registers.
An update routine, which is called upon frequently, quickly revises all status
registers according to the contents of the status change request registers.
During this operation, if the details of a new machine condition are placed in
status register n, an indicator bit is turned on in status register 0 to call attention
to the fact that status register n needs to be read. Following reading, status
register n and the corresponding indicator bit in register 0 are cleared. As such,
machine state changes that call for simultaneous changes in two or more status
registers are presented unambiguously to the system interface.