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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SCANPSC110FDMQB датащи(PDF) 9 Page - National Semiconductor (TI) |
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SCANPSC110FDMQB датащи(HTML) 9 Page - National Semiconductor (TI) |
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9 / 29 page  Hierarchical Test Support Multiple SCANPSC110F Bridges can be used to assemble a hierarchical boundary-scan tree. In such a configuration, the system tester can configure the local ports of a set of ’PSC110Fs so as to connect a specific set of local scan-chains to the active scan chain. Using this capability, the tester can selectively communicate with specific portions of a target system. The tester’s scan port is connected to the backplane scan port of a “root” layer of ’PSC110Fs, each of which can be se- lected using multi-drop addressing. A second tier of ’PSC110Fs can be connected to this root layer, by connect- ing a local port (LSP) of a root-layer ’PSC110F to the back- plane port of a second-tier ’PSC110F. This process can be continued to construct a multi-level scan hierarchy. ’PSC110F local ports which are not cascaded into higher-level ’PSC110Fs can be thought of as the terminal “leaves” of a scan “tree”. The test master can select one or more target leaves by selecting and configuring the local ports of an appropriate set of ’PSC110Fs in the test tree. Level 1 Protocol ADDRESSING MODES The SCANPSC110F Bridge supports “single” and “multiple” modes of addressing a ’PSC110F. The “single” mode will se- lect one ’PSC110F and is called Direct Addressing. More than one ’PSC110F device can be selected via the Broad- cast and Multi-Cast Addressing modes. www.national.com 9 |
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