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DEVICE FOR CONVERTING D-TYPE FLIP-FLOP INTO B-TYPE FLIP-FLOP ABLE TO SAMPLE DATA BY BOTH OF FRONT EDGE AND REAR EDGE OF CLOCK SIGNAL
DEVICE FOR CONVERTING D-TYPE FLIP-FLOP INTO B-TYPE FLIP-FLOP ABLE TO SAMPLE DATA BY BOTH OF FRONT EDGE AND REAR EDGE OF CLOCK SIGNAL
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机译:用于将D型翻转器转换成B型翻转器的装置,其能够通过时钟信号的前边缘和后边缘两者来采样数据
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摘要
PURPOSE: To automatically suite a delay element to the timing request of a flip flop by obtaining the first input of an exclusive OR circuit as the clock input of a B-type flip flop, connecting the second input with the D input of a first D-type flip flop, and short-circuiting this D input with the QN output of the same first D-type flip flop. CONSTITUTION: A flip flop 4 operates switching in each clock transfer, this operates as a divider by a divisor 2, the inversion of a clock input 2d of a flip flop 2 is applied, and preliminary arrangement for the next transfer is applied. Propagation delay is normally equal to the minimum pulse width or larger than that, and the minimum clock width of the last one for the both flip flops depends on the propagation time of the flip flop 2 to which the delay time by the exclusive OR circuit 3 should be added. When the delay time of the exclusive OR circuit 3 is ignored, the smaller delay time is made correspond to the propagation time of a flip flop 4.
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