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26.4
Operation
26.4.1
TAP Controller State Transitions
Figure 26.2 shows the internal states of the TAP controller. State transitions basically conform to
the IEEE1149.1 standard.
1
Test-logic-reset
0
Run-test/idle
0
1
Select-DR-scan
1
Capture-DR
0
Update-DR
Figure 26.2 TAP Controller State Transitions
1
0
0
0
Shift-DR
1
1
Exit1-DR
0
0
Pause-DR
1
Exit2-DR
1
1
0
Rev. 1.00 Mar. 12, 2008 Page 1043 of 1178
Section 26 Boundary Scan (JTAG)
1
Select-IR-scan
0
1
Capture-IR
0
0
Shift-IR
1
1
Exit1-IR
0
0
Pause-IR
1
0
Exit2-IR
1
Update-IR
1
0
REJ09B0403-0100
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