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DCS (Differential Current Switch) logic is comprised of the primitive function SELECT from which the simpler functions, XOR, AND and OR, are derived.
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Load Sharing Among SELECT Signals
DCS (Differential Current Switch) logic is comprised of the primitive function
SELECT from which the simpler functions, XOR, AND and OR, are derived.
A large SELECT function is implemented in 2 or more stages of smaller
SELECT functions that are available as single gates. For example, Let F be a
one-of-16 SELECT function as follows:
where A, B, C, and D comprise a 4-bit select code and DO through D15
comprise the 16 data signals of which one is selected.
The first stage, for example, uses signals C and D to select one of 4 data
signals from each of 4 groups of data signals. The second stage then uses
signals A and B to select one of the 4 groups. In equation form
Note that signals C and D are in the critical path of the implied logic and each of
their decoded values (C.D, C.D, C.D, and C.D) sees 4 loads.
To reduce the load on C and D, the equation for F is changed so as to allow
all four select signals, A through D, to participate in the first stage logic, as
The advantages of load sharing become more obvious when implementing a
still larger SELECT function. For example, a 64-way SELECT function using a 6-
bit code (A, B, C, D, E and F) may use 4 of the 6 code bits (say C, D, E and F) to
select data signal from each of 4 sets of 16 data signals in the first two stages if
4-wat SELECT gates. An equation similar to the example above is used. The
remaining 2 code bits, A and B...