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Photosensors for testing an integrated circuit

  • US 6,448,802 B1
  • Filed: 12/21/1998
  • Issued: 09/10/2002
  • Est. Priority Date: 12/21/1998
  • Status: Expired due to Fees
First Claim
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1. A method of testing test circuitry on an integrated circuit, the method comprising:

  • providing a first spectral input to the integrated circuit, the first spectral input being converted by a photosensor on the integrated circuit to generate a data signal input used by the test circuitry to generate a result output;

    checking the result output to determine whether the test circuitry is functioning properly;

    providing a second spectral input to the integrated circuit, the second spectral input used to generate a gating signal input to the test circuitry, the result output being based on the data signal input gated by the gating signal input; and

    shifting one or more bits responsive to the gating signal input wherein the shifting of the one or more bits corresponds to boundary scan testing.

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