1. To execute an instruction, the sequencing logic unit issues a READ command
to the control memory.
2. The word whose address is specified in the control address register is read into
the control buffer register.
3. The content of the control buffer register generates control signals and nextaddress
information for the sequencing logic unit.
4. The sequencing logic unit loads a new address into the control address register
based on the next-address information from the control buffer register and the
ALU flags.