CS 152 Computer Architecture and Engineering Spring ….ppt

CS 152 Computer Architecture and EngineeringLecture 10Multicycle Controller Design (Continued) ;Recap;Overview of Control;Recap: Controller Design;Recap: Microprogram Control Specification;The Big Picture: Where are We Now? ;How Effectively are we utilizing our hardware?;“Princeton” Organization;Alternative datapath (book): Multiple Cycle Datapath;Our Controller FSM Spec;Microprogramming;Sequencer-based control unit;“Macroinstruction” Interpretation;Variations on Microprogramming;Extreme Horizontal;More Vertical Format;Hybrid Control;Vax Microinstructions;Horizontal vs. Vertical Microprogramming;Administration;Designing a Microinstruction Set;12) Start with list of control signals, grouped into fields;Start with list of control signals, cont’d;3) Microinstruction Format: unencoded vs. encoded fields;4) Legend of Fields and Symbolic Names;Microprogram it yourself!;Alternative datapath (book): Multiple Cycle Datapath;Microprogram it yourself!;Legacy Software and Microprogramming;Microprogramming Pros and Cons;An Alternative MultiCycle DataPath;What about a 2-Bus Microarchitecture (datapath)?;Load;Exceptions;What happens to Instruction with Exception?;Two Types of Exceptions;MIPS convention:;Addressing the Exception Handler;Saving State;Additions to MIPS ISA to support Exceptions?;Recap: Details of Status register;Big Picture: user / system modes;Recap: Details of Cause register;Precise Interrupts;How Control Detects Exceptions in our FSD;Modification to the Control Specification;Summary;Summary: Microprogramming one inspiration for RISC