| 摘要 |
A controller for controlling access to a plurality of records that can be accessed and changed by several independent processors comprises: a plurality of flip-flops corresponding in number to the plurality of records with each flip-flop representing a particular record; a circuit for receiving a programmable control word from any of the processors which identifies multiple records of which access is sought; a circuit for selecting in parallel and logically ANDing output signals from all of those flip-flops which correspond to the identified records; a circuit for sending a signal, if the ANDing operation yields a logical ONE, to the processor which sent the control word signaling that it may access and change the identified records; a circuit for setting in parallel via a single pulse all of those flip-flops which correspond to the identified records if the ANDing operation yields a logical ONE; and a circuit for storing the control word if the ANDing operation yields a logical ZERO.
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