| slovo | definícia |
vertical encoding
(foldoc) | vertical encoding
An instruction set where a field (a bit or group
of bits) of the instruction word is decoded (either by
hard-wired logic or microcode) to generate signals to
control the functional units, as opposed to {horizontal
encoding} where the instruction word bits are used as the
control signals directly.
With vertical encoding, which combinations of signals and
operations are possible is dictated by the decoding logic; the
instruction field can only select one of these preprogrammed
combinations. This has the advantage that many control
signals can be generated based on only a few instruction word
bits and only valid combinations of control signals can be
generated, e.g. only one source driving a bus at once. An
instruction set may use a mixture of horizontal and vertical
encoding within each instruction.
(1995-04-23)
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