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PC87591L Datasheet(PDF) 255 Page - National Semiconductor (TI) |
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PC87591L Datasheet(HTML) 255 Page - National Semiconductor (TI) |
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255 / 437 page  Embedded Controller Modules (Continued) Revision 1.07 255 www.national.com Figure 82. TAP Controller State Diagram For a detailed description of the controller states, see the IEEE 1149.1b-1994 specifications. All state transitions of the TAP controller occur based on the value of TMS on the rising edge of TCK. TAP actions (described in Sections 2.1.3 to 2.1.7) occur either on the rising or falling edge of TCK in each controller state, as shown in Figure 83. Figure 83. Timing of Actions in a Controller State Tap-Reset Run-Test Idle Select- DR-Scan Capture-DR Shift-DR Exit1-DR Pause-DR Exit2-DR Update-DR 0 0 1 0 1 1 1 0 1 0 0 1 0 0 1 Select- IR-Scan Capture-IR Shift-IR Exit1-IR Pause-IR Exit2-IR Update-IR 0 0 1 0 1 1 1 0 1 0 0 1 0 1 0 1 Note: The value for each state transition represents the signal on TMS 1 for a rising edge at TCK. State Entered Controller State TCK Actions Occurring on the Falling Edge of TCK Actions Occurring on Rising Edge of TCK |
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