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US 7,398,441 B1Granted
System and method for providing secure boundary scan interface access
AssigneeRockwell Collins, Inc.
InventorJohn K. Gee
Life of this patent
Estimating the term…
Abstract
The present invention is a method including: receiving an input key string; comparing the input key string with a stored key string; and granting access to a boundary scan chain when the input key string matches the stored key string, the boundary scan chain being at least one of: a Boundary Data Register of at least one Joint Test Action Group (JTAG)-compliant device; or, a plurality of communicatively coupled JTAG-compliant devices.
Claims5
An apparatus, comprising:
- a shift register including a plurality of flip-flops for receiving an input key string;
- a plurality of XNOR gates communicatively coupled with the shift register for comparing the input key string with a stored key string;
- and
- a multi-input AND gate communicatively coupled with the plurality of XNOR gates for receiving input signals from the plurality of XNOR gates,
- wherein the input signals received from the plurality of XNOR gates drive the AND gate high when the input key string matches the stored key string, thereby granting a user access to a boundary scan chain, the boundary scan chain being at least one of:
- a Boundary Data Register of at least one Joint Test Action Group (JTAG)-compliant device;
- or, a plurality of communicatively coupled JTAG-compliant devices.
4 more elements
Dependencies are inferred from the claim text.