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The logic shown provides the ability to stop on a particular sequence of microinstructions and to re-initialize the stop mechanism on a particular microinstruction or event.
English (United States)
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Control Storage Sequence Trap
The logic shown provides the ability to stop on a particular sequence of
microinstructions and to re-initialize the stop mechanism on a particular
microinstruction or event.
A service aid on most computers is the ability to stop on a particular
microinstruction. The usefulness of this ability can be very limited if the target
microinstruction is either executed in several different paths or executed many
times before the desired execution. The desired execution of the target
microinstruction can usually be associated with other microinstructions having
been executed previously in a particular sequence. Also, a particular
microinstruction or hardware event can usually be identified that marks the
beginning of the desired sequence.
To stop on a particular sequence of microinstructions, several
microinstruction address compare registers can be used. Each compare register
is compared to the address of the microinstruction currently being executed. A
compare equal between the 1st compare register and the current
microinstruction address sets the "1st Latch". If a compare equal occurs
between the 2nd compare register and the current microinstruction address, and
the "1st Latch" is on, the "2nd Latch" is set. This continues until a compare equal
occurs between the "n/th/" compare register and the current microinstruction
address, and the "(n-1)/th/" latch is on. At this time the computer is stopped.