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System and method for providing scan chain for digital electronic device having multiple clock domains

  • US 5,909,451 A
  • Filed: 11/21/1996
  • Issued: 06/01/1999
  • Est. Priority Date: 11/21/1996
  • Status: Expired due to Term
First Claim
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1. A digital circuit device comprising:

  • A. a plurality of circuit elements defining a plurality of clock domains, the ones of the circuit elements in each clock domain being adapted to perform operations under control of a respective one of a plurality of domain clock signals, at least one of said domain clock signals having a timing characteristic which differs from that of another of said domain clock signals;

    B. a scan chain establishment element adapted to interconnect said circuit elements in an input scan chain to facilitate loading of a scan vector into said plurality of circuit elements; and

    C. a unitary clock domain establishment element adapted to establish a unitary clock domain for said circuit elements when said scan chain establishment element is interconnecting said circuit elements in said input scan chain.

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