Figure 4-19.—Example of a demultiplexer circuit.
l Demultiplexer —A data demultiplexer routes
data from one input to any one of several outputs. Refer
to figure 4-19.
. Selectors —Some registers have no input
selection capability and require the selection of source
information to be made before actual input gating.
They expand the number of input data paths to a register.
Refer to figure 4-20.
Figure 4-20.—Example of a selector circuit.
. Translators —This type of circuitry in a
computer can be used to translate bits of data into a code
to be used in different parts of the computer. An
example is a function code translator used to translate
machine octal codes into function codes so the
computer can execute instructions. Different parts of a
translator provide partial translation to initiate certain
preliminary operations connected with instruction
execution.
Other parts of a translator provide the
Figure 4-21.—Example of preliminary translator circuitry.
4-14
