Test-default-Strobe

Use a strobe before the clock protocol. This protocol is automatically inferred by TC when the test default.strobe is set before the active clock edge. In this protocol file the parallel measure and the parallel capture cycles are combined into one. 

Analyze the testability of the design prior to scan insertion using the check.test command. A default test protocol is inferred and simulated on executing the check test command. The default test protocol consists of the following initialization vectors, scan-in/scan-out, parallel measure, capture and scan out strobe. 

The default test protocol inferred by TC has four phases Scan Shift, Parallel Measure, Parallel Capture, and Scan-Out Strobe. Each test pattern has all these phases. The length of the scan shift phase is equal to the length of the longest scan chain in the design. The remaining three phases are of one cycle with the test clock being pulsed in only during scan shift and the parallel capture cycle. Shown below are the values of the bi-directionals in the different phases ... 

Eveiy test pattern consists of the following phases scan-shift, parallel measure, parallel capture, and scan-out strobe. You can add initialization vectors at the start of the test program using the read init protocol command. Shown below is the default protocol inferred by TC for a design after scan-insertion. 

In the default test protocol inferred by TC, the last scan cell in the scan chain is strobed in the scan-out strobe cycle after the parallel capture cycle. If this is not the case, the next scan-shift cycle will overwrite the captured response in the last scan cell before it is strobed. Hence in the last cycle of the scan shift there is no expected response, that is an X. 

In the default test protocol inferred by TC there is a separate scan-out strobe cycle after the parallel-capture cycle. Why is this cycle not merged with the parallel-capture cycle ... 

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