Synthesis of compositional microprogram control units with object transformation

The chapter is devoted to optimization methods based on the transformation of codes. This method can be applied, when the FSM performing microinstruction addressing generates functions, which are subsequently loaded into two different mitory blocks (the register and the counter). Some of these functions are treated as primary objects and the others as secondary objects. The FSM combinational part generates codes of primary objects and some additional variables only. This information is used to generate codes of secondary objects and permits to reduce the number of inputs in the block generating codes of secondary objects, in comparison with the initial combinational part of FSM and to reduce the hardware amount of resulting CMCU logic.