Boundary Scanning chain self-testing method
A technology of boundary scan and boundary scan unit, which is applied in the direction of electronic circuit testing and detection of faulty computer hardware, etc. It can solve the problems of incomplete testing and low security, and achieve the effect of complete testing content and guaranteed testing safety
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[0037] The present invention will be further described below in conjunction with the accompanying drawings.
[0038] Fig. 7 is a flowchart of an embodiment of the method of the present invention. According to Figure 7, first determine the boundary scan chain to be tested in step 1, that is, connect the TDO line and TDI line of the boundary scan device to be tested on the circuit board in series, and connect the TMS, TCK and / TRST lines in parallel. At the same time, connect the above connection to the JTAG interface as well. Then proceed to step 2, according to the number of boundary scan devices on the boundary scan chain, and the bit length of each register to be tested in each boundary scan device and the number of boundary scan cells, determine the content that the boundary scan chain needs to test and its Corresponding length digits. The test content described here comprises register test and boundary-scan unit test; For register test, described length digit is the sum ...
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