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Scan and boundary scan disable mechanism on secure device

  • US 7,228,440 B1
  • Filed: 12/20/2002
  • Issued: 06/05/2007
  • Est. Priority Date: 02/13/2002
  • Status: Expired due to Fees
First Claim
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1. A circuit comprising:

  • a plurality of logic modules configured to (i) store a plurality of values and (ii) force said values in storage to a plurality of predetermined values respectively while a scan mode signal is active; and

    a security module configured to (i) disable a scan capability to read said values through a first scan chain while in a non-lowest security mode of at least three security modes and (ii) enable said scan capability to read said values through said first scan chain while in a lowest security mode of said at least three security modes.

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  • 9 Assignments
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