CS61583 datasheet(20/44 Pages) CIRRUS

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The test data register selected by the current in-

struction retains its previous value during this

state.

The instruction does not change in this

state.

When the controller is in this state and a rising

edge is applied to J-TCK, the controller enters

the Exit1-IR state if J-TMS is held high, or re-

mains in the Shift-IR state if J-TMS is held low.

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 register selected by the current in-

struction retains its previous value during this state.

The instruction does not change in this state.

Pause-IR State

The pause state allows the test controller to tem-

porarily halt the shifting of data through the

instruction register.

The test data register selected by the current in-

struction retains its previous value during this

state. The instruction does not change in 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.

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 during this

state.

The instruction does not change in this

state.

Update-IR State

The instruction shifted into the instruction regis-

ter is latched into the parallel output from the

shift-register path on the falling edge of J-TCK.

When the new instruction has been latched, it

becomes the current instruction.

Test data registers selected by the current in-

struction retain their previous value.

JTAG Application Examples

Figures 13 and 14 illustrate examples of updat-

ing the instruction and data registers during

JTAG operation.

CS61583

DS172PP5

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