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Various logic applications require switching of a number of functions onto a common line or bus. Figs. 1 and 2 illustrate common implementations of such applications.
English (United States)
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Use of Tristate Circuitry to Perform Logical Functions
Various logic applications require switching of a number of functions onto a
common line or bus. Figs. 1 and 2 illustrate common implementations of such
In Fig. 1, the number of inputs which the OR circuit is capable of receiving,
and/or the physical space required by the OR circuitry may become a limiting
factor. In the embodiment of Fig. 2, either the poor rise or fall times of the
circuitry, or a technology dotting limitation may become limiting factors.
The implementation of Fig. 3 solves the above problems by utilizing circuitry
that exhibits a tristate output. However, it requires that multiple functions not be
gated onto the line or bus simultaneously. In the arrangement illustrated, the
gating logic must have the capability of switching to the desired tristate output set
forth in the table associated with the figure. The configuration utilizes driven
rising and falling signal transitions, thereby reducing capacitive effects. It
performs the same logical functions assuming non-overlapping gates. Less
space is required than with configurations utilizing a combining logic block, and
therefore no block delay or inversion is required.
The embodiment does require simultaneous switching and uses a high
impedance state which must be accommodated by subsequent logic.
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