Integrated circuits

专利名称：Integrated circuits

发明人：Richard D. Simpson,Iain C. Robertson申请号：US07/373123申请日：19890628公开号：US04992727A公开日：19910212

摘要：A digital data storage circuit for a digital signal processor which is capable ofreceiving asynchronous inputs and is such as to be testable by selectively configuring thestorage circuits as a shift register enabling the entry and extraction of test data in theprocessor. The storage circuit includes two latch elements each formed by two

complementary transistor inverter circuits connected in a positive feedback arrangementand in which the output current capability of the second inverter circuit is restricted toenable the latch element to change state in response to input signals applied to it.Asynchronous inputs are applied to a first latch element through switch means

comprising a complementary transistor inverter responsive to a SET input in series with atransistor responsive to a CLEAR input. The complementary inverter is connected to theinput of the first latch element through a series connected transistor. During testing theseries connected transistor is blocked and the first latch element is connected in a twoelements per bit shift register configuration with the second latch element by seriesconnected transistors controlled by antiphase square waves.

申请人：TEXAS INSTRUMENTS INCORPORATED

代理人：William E. Hiller,N. Rhys Merrett,Melvin Sharp

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