| vertical encoding An where a field (a bit or group of bits) of the instruction word is decoded (either by or ) to generate signals to control the s, as opposed to 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 at once. An may use a mixture of horizontal and vertical encoding within each instruction. (1995-04-23) |
на заглавную 
к началу страницы