CS61584A datasheet(36/54 Pages) CIRRUS

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CS61584A

DS261PP5

10.16 Exit1-IR State

This is a temporary state. While in this state, if J-

TMS is held high, a rising edge applied to J-TCK

causes the controller to enter the Update-IR state,

which terminates the scanning process. If J-TMS is

held low and a rising edge is applied to J-TCK, the

controller enters the Pause-IR state. The test data

its previous value and the instruction does not

change during this state.

10.17 Pause-IR State

The pause state allows the test controller to tempo-

rarily halt the shifting of data through the instruc-

tion register. The test data register selected by the

current instruction retains its previous value and

the instruction does not change during this state.

The controller remains in this state as long as J-

TMS is low. When J-TMS goes high and a rising

edge is applied to J-TCK, the controller moves to

the Exit2-IR state.

10.18 Exit2-IR State

This is a temporary state. While in this state, if J-

TMS is held high, a rising edge applied to J-TCK

causes the controller to enter the Update-IR state,

which terminates the scanning process. If J-TMS is

held low and a rising edge is applied to J-TCK, the

controller enters the Shift-IR state.

The test data register selected by the current in-

struction retains its previous value and the instruc-

tion does not change during this state.

10.19 Update-IR State

The instruction shifted into the instruction register

is latched into the parallel output from the shift-reg-

ister path on the falling edge of J-TCK. When the

new instruction has been latched, it becomes the

current instruction. The test data registers selected

by the current instruction retain their previous val-

ue.

10.20 JTAG Application Examples

Figures 25 and 26 illustrate examples of updating

the instruction and data registers during JTAG op-

eration.

CS61584A

DS261F1

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