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26.4.5.10
Select-IR-Scan State
Select-IR-Scan is a temporary controller state. In this state, the test data register selected by the
current instruction retains its previous value. If TMS is held low on the rising edge of TCK in this
state, the controller moves into the Capture-IR state, and a scan sequence for the instruction
register is initiated. If TMS is held high on the rising edge of TCK, the controller moves to the
Test-Logic-Reset state.
The current instruction does not change in this state.
26.4.5.11
Capture-IR State
When the controller is in the Capture-IR state, the shift register contained in the instruction register
loads the fixed value 0b000_0001 on the rising edge of TCK. See
associated with this value.
The test data register selected by the current instruction retains its previous value during this state.
The current instruction does not change in this state. In the Capture-IR state, holding TMS high on
the rising edge of TCK causes the controller to enter the Exit1-IR state. If TMS is held low on the
rising edge of TCK, the controller enters the Shift-IR state.
26.4.5.12
Shift-IR State
When the controller is in the Shift-IR state, the shift register contained in the instruction register is
connected between TDI and TDO and shifts data one bit position nearer to its serial output on each
rising edge of TCK. The test data register selected by the current instruction retains its previous
value during this state. The current instruction does not change.
If TMS is held high on the rising edge of TCK, the controller enters the Exit1-IR state. If TMS is
held low on the rising edge of TCK, the controller remains in the Shift-IR state.
26.4.5.13
Exit1-IR State
Exit1-IR is a temporary state. If TMS is held high on the rising edge of TCK, the controller enters
the Update-IR state, which terminates the scanning process. If TMS is held low on the rising edge
of TCK, the controller enters the Pause-IR state. The test data register selected by the current
instruction retains its previous value during this state. The current instruction does not change and
the instruction register retains its state.
26.4.5.14
Pause-IR State
The Pause-IR state allows the test controller to temporarily halt the shifting of data through the
instruction register. The test data register selected by the current instruction retains its previous
value during this state. The current instruction does not change and the instruction register retains
its state.
The controller remains in this state as long as TMS is held low. When TMS goes high on the rising
edges of TCK, the controller moves to the Exit2-IR state.
®
Intel
PXA27x Processor Family Design Guide
JTAG Debug
Table 26-2
for the instruction
II:26-13
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