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The shift register depicted in the drawing allows the shifting and holding of two bits of information with three latches.
English (United States)
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Multi-Purpose Three Latch/Stage Shift Register
The shift register depicted in the drawing allows the shifting and holding of
two bits of information with three latches.
Conventional shift registers have two latch/stages. One latch is used to hold
the data as it is being transferred to the succeeding latch. There are two shift
clocks, one associated with each latch in a stage. This implementation allows
one bit of information/stage to be shifted through the shift register. For the two
latch/stage shift register, the number of bits/latch that can be serially shifted is
By increasing the number of shift clocks (with a corresponding increase in the
number of latch/stages), the number of bits/latch which can be serially shifted is
increased. For the shift register shown in the drawing, the number of bits/latch
that can bs serially shifted is 2/3. Generally, for an N latch/stage shift register
the number of bits/latch that can be serially shifted is N-1/N. This requires N
shift clock, with each shift clock dedicated to each latch in a stage. For proper
operation, the registers are clocked in descending order or backward while the
data is transferred or is rippled forward. In the drawing, if the latches are
identified A, B, C, then the order of clocking is C,B, A, while data is transferred
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