Series equivalent scans across multiple scan topologies
First Claim
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1. A method for performing series equivalent scans in a target system comprising a complex scan topology with a plurality of branches, the method comprising:
- performing shift operations in the complex scan topology while scan path connectivity of only one branch of the complex scan topology is enabled, wherein a first branch and a second branch are different test access port technologies, and wherein a first protocol is used to perform shift operations on the first branch and a different second protocol is used to perform shift operations on the second branch; and
performing capture and update operations in the first branch and the second branch of the complex scan topology in parallel.
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Abstract
Performing series equivalent scans spanning a plurality of scan technologies in a complex scan topology may be performed by performing shift operations in the complex scan topology while only one branch of the complex scan topology connectivity is enabled, and performing capture and update operations in parallel while scan topology connectivity of two or more of the plurality of scan technologies is enabled.
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Citations
21 Claims
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1. A method for performing series equivalent scans in a target system comprising a complex scan topology with a plurality of branches, the method comprising:
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performing shift operations in the complex scan topology while scan path connectivity of only one branch of the complex scan topology is enabled, wherein a first branch and a second branch are different test access port technologies, and wherein a first protocol is used to perform shift operations on the first branch and a different second protocol is used to perform shift operations on the second branch; and performing capture and update operations in the first branch and the second branch of the complex scan topology in parallel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 18, 19, 20)
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12. A digital system, comprising:
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a plurality of components, each having a test access port (TAP) configured to perform diagnostic tests on the associated component in response to commands presented to the TAPs, the TAPs of the plurality of components connected to form a complex scan topology having two or more branches, the complex scan topology configured to couple to the source of commands; wherein a first branch and a second branch have different test access port technologies, and wherein the first branch is configured to respond to a first protocol to perform shift operations while the second branch is in an offline mode, and the second branch is configured to respond to a different second protocol to perform shift operations while the first branch is in an offline mode; and wherein the first branch and the second branch are configured to respond to a common protocol to perform capture and update operations in parallel. - View Dependent Claims (13, 14, 15, 16, 17, 21)
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Specification