scan register

(circuit design) A digital logic circuit which can acteither as a flip-flop or as a serial shift register andwhich is used to form a scan path.

The most common design is a multiplexed flip-flop:

___ ____normal in --| \\ | || |------|D Q|---- normal/scan outputscan in ----|___/ mux | || | |test mode ----+ +----|> | flip-flop| |____|clk ---------------+

The addition of a multiplexor (mux) to each flip-flop'sinput allows operation in either normal or test mode. Theoutput of each flip-flop goes to the normal functional logicas well as to the scan input of the next multiplexor in thescan path.

The other common design is level-sensitive scan design(LSSD).

单词	scan register
释义	scan register scan register (circuit design) A digital logic circuit which can acteither as a flip-flop or as a serial shift register andwhich is used to form a scan path. The most common design is a multiplexed flip-flop: ___ ____normal in --\| \\ \| \|\| \|------\|D Q\|---- normal/scan outputscan in ----\|___/ mux \| \|\| \| \|test mode ----+ +----\|> \| flip-flop\| \|____\|clk ---------------+ The addition of a multiplexor (mux) to each flip-flop'sinput allows operation in either normal or test mode. Theoutput of each flip-flop goes to the normal functional logicas well as to the scan input of the next multiplexor in thescan path. The other common design is level-sensitive scan design(LSSD).
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