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The parallel output of the instruction register will change on the falling edge of TCK, as is the case in the Update-IR controller state. In contrast, when a logic 0 is applied to TRST*, Reset* consequently is asserted (low) (see Figure 6-5) and the change at the parallel output occurs immediately, irrespective of the state of TMS or TCK. 1 e). Copyright © 2001 IEEE. All rights reserved. 1-2001 d) IEEE STANDARD TEST ACCESS PORT AND Application of a 0 at TRST* causes the parallel output to be asynchronously set low.

Nontest) operation of the component. , a logic 0 is loaded into every instruction register cell). While use of this binary code is no longer mandated, nor is it prohibited, it should be noted that such use may be detrimental to the implementation of high-reliability systems, as an apparent stuck-at-zero fault condition at a component’s TDI pin could result in unexpected selection of EXTEST and consequent removal of the component from normal service. Permissions f) g) 36 The mode of operation of a test data register may be defined by a combination of the current instruction and further control information contained in test data registers.

1-2001 BOUNDARY-SCAN ARCHITECTURE Table 6-2—Test logic operation in each controller state Controller state Register selected to drive TDO TDO driver Test-Logic-Reset Undefined Inactive Run-Test/Idle Undefined Inactive Select-DR-Scan Undefined Inactive Select-IR-Scan Undefined Inactive Capture-IR Undefined Inactive Shift-IR Instruction Active Exit1-IR Undefined Inactive Pause-IR Undefined Inactive Exit2-IR Undefined Inactive Update-IR Undefined Inactive Capture-DR Undefined Inactive Shift-DR Test data Active Exit1-DR Undefined Inactive Pause-DR Undefined Inactive Exit2-DR Undefined Inactive Update-DR Undefined Inactive NOTE—Some components designed before publication of this standard may conform in every respect except that they have TDO active in the Capture-IR, Pause-IR, Exit1-IR, Exit2-IR, Capture-DR, Pause-DR, Exit1-DR, and Exit2-DR controller states, in addition to the Shift-IR and Shift-DR controller states.

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