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Operand Width Aware Hardware Reuse: A low cost fault-tolerant approach to ALU design in embedded processors
, Article Microelectronics Reliability ; Volume 51, Issue 12 , December , 2011 , Pages 2374-2387 ; 00262714 (ISSN) ; Namazi, A ; Miremadi, S. G ; Haghdoost, A ; Sharif University of Technology
2011
Abstract
This paper presents a low cost fault-tolerant technique so called OWHR (Operand Width Aware Hardware Reuse) to ALU design in embedded processors. The OWHR technique is motivated by two facts: (1) Many of the produced and consumed values are narrow-width values in the embedded processors, i.e. they have leading zeros or ones in their most significant bits. This indicates that only a fraction of the circuit is performing useful operations when a particular arithmetic or logic circuit in the ALU is operating on narrow-width values; (2) other circuits of the ALU are not used, when a particular arithmetic or logic circuit is being utilized to perform a specific operation in the ALU in the...