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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TMPR4955AF датащи(PDF) 146 Page - Toshiba Semiconductor |
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TMPR4955AF датащи(HTML) 146 Page - Toshiba Semiconductor |
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146 / 168 page  Chapter 7 JTAG Interface 7-12 7.4.2 The SAMPLE/PRELOAD Instruction This instruction targets the boundary scan register between JTDI and JTDO. As the instruction's name implies, two functions are performed through use of the SAMPLE/ PRELOAD instruction. • SAMPLE allows the input and output pads of an IC to be monitored. While it does so, it does not disconnect the system logic from the IC pins. The SAMPLE function occurs in the Capture-DR controller state. An example application of SAMPLE is to take a snapshot of the activity of the IC's I/O pins so as to verify the interaction between ICs during normal functional operation. The flow of data for the SAMPLE phase of the SAMPLE/PRELOAD instruction is shown in Figure 7.4.2. Figure 7.4.2 Test Data Flow While SAMPLE is Selected • PRELOAD allows the boundary scan register to be initialized before another instruction is selected. For example, prior to selection of the EXTEST instruction, initialization data is shifted into the boundary scan register using PRELOAD as described in the previous subsection. PRELOAD permits shifting of the boundary scan register without interfering with the normal operation of the system logic. The flow of data for the PRELOAD phase of the SAMPLE/PRELOAD instruction is shown in Figure 7.4.3. Figure 7.4.3 Test Data Flow While PRELOAD is Selected Core Logic OUTPUT JTDO INPUT JTDI Boundary Scan Path OUTPUT JTDO INPUT JTDI Boundary Scan Path Core Logic |
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