COMMAND PROTOCOL OPERATIONS INITIALIZING ALU For RISC By: Ricardo Maurosa Wilfredo Soto Félix Rivera Electrical/Computer Engineering December 15th, 2004

COMMAND PROTOCOL OPERATIONS INITIALIZING Outline Description – What is an ALU? – Operations ALU for RISC – Design – Functionality & Timing Diagrams Conclusions References

COMMAND PROTOCOL OPERATIONS INITIALIZING Description What is an ALU? ALU – Arithmetic Logic Unit – Devices connected in series – AND, OR, NAND, NOT

COMMAND PROTOCOL OPERATIONS INITIALIZING Description Operations – Arithmetic – ADD, ADC, SUB, NEG, INC3 – Logic – AND, OR, NOT, SHR, SHRA, SHL, SHC – Others – C = B

COMMAND PROTOCOL OPERATIONS INITIALIZING ALU For RISC Design

COMMAND PROTOCOL OPERATIONS INITIALIZING Inside the ALU

COMMAND PROTOCOL OPERATIONS INITIALIZING Ripple Full Adder

COMMAND PROTOCOL OPERATIONS INITIALIZING Arithmetic Functions

COMMAND PROTOCOL OPERATIONS INITIALIZING Logic Functions

COMMAND PROTOCOL OPERATIONS INITIALIZING

COMMAND PROTOCOL OPERATIONS INITIALIZING

COMMAND PROTOCOL OPERATIONS INITIALIZING

COMMAND PROTOCOL OPERATIONS INITIALIZING

COMMAND PROTOCOL OPERATIONS INITIALIZING ABC

COMMAND PROTOCOL OPERATIONS INITIALIZING B C

COMMAND PROTOCOL OPERATIONS INITIALIZING A BC

COMMAND PROTOCOL OPERATIONS INITIALIZING Conclusion – Understanding the behavior and functionality of the ALU – Components inside the ALU – Different dataflow for operations – 1, 2 or 3 Buses differences

COMMAND PROTOCOL OPERATIONS INITIALIZING References V.P. Heuring and H.F. Jordan, “ Computer Systems Design and Architecture”, Second Edition, USA, Prentice-Hall; “Wikipedia: The Free Enciclopedia”, URL “Logic Gates”, URL