Informatie over | Engels woord MICROINSTRUCTIONS

Since CPUs implement an instruction set, it's very useful to be able to decode the instruction's bits directly into the sequencer, to select a set of microinstructions to perform a CPU's instructions.
There were 19 different microinstruction opcodes, however certain microinstructions could carry out different operations depending on which bits were set in the rest of the microinstruction, meaning that there were about 70 distinct operations available in total.
As this happens on the μop-level, sub-operations of different machine (macro) instructions may often intermix in a particular μop-sequence, forming partially reordered machine instructions as a direct consequence of the out-of-order dispatching of microinstructions from several macro instructions.
P-code instructions that took multiple multiple microinstructions to execute could not start with a branch, (as this field is already used to jump to the rest of the microprogram for the instruction).
The MIB (microinstruction bus) carried microinstructions control signals and addresses from the control store to the I/E and F chips.
9-bit microinstructions which are mapped through a mask-programmable PLA to a 20-bit internal control word, which is stored in the 20-bit operations register in order to allow microinstruction pipelining.

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