476 Appendix B
Status Reporting System
General Status Register Model
Transition filter and condition register
The transition filter allows you to select which transitions of the condition of the 4294A
will set a bit in the event register.
When the status register has a transition filter, there is a lower register called a condition
register under the event register. The transition filter is between the event register and the
condition register. The transition filter enables you to select a positive and/or negative
transition of the condition register bit to set a bit in the corresponding event register. For
example, if you set the negative transition filter, a “1” is set in the event register by
changing from “1” to “0” in the condition register.
Figure B-2 Transition Filter and Condition Register
For the 4294A, only the “Program Running” and “Printing” bits of the operation status
register has a transition filter (See
Figure B-3). By using the transition filter, you can
generate an SRQ at the start and/or the end of the program execution.
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