ABSTRACT
Micro-instructions are fewer instructions than declarations. That is to say, they describe the composition of a circuit, rather than describing a procedure used in a calculation. In hardwired control, the micro-instructions executed are implemented in circuitry. The sequence field specifies how the sequencer can calculate the location of the next instruction to execute. For a conditional branch, the address of the next micro-instruction is calculated by two components: the micro-control-Read Only Memory, which contains the jump table, and the mapper. The mapper is a circuit that is used to form an address out of the control word. The horizontal control design, in general, results in a shorter micro-instruction format than the direct control design. In vertical control design, graduate students typically first divide the micro-operations into groups. These groups are often associated with processor devices. To compare hardwire control with micro-programmed control, one can think of at least three criteria that might be used.
