CS61583 datasheet(18/44 Pages) CIRRUS

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instruction register and all test data registers re-

tain their previous state. When J-TMS is high

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

troller moves to the Select-DR state.

Select-DR-Scan State

This is a temporary controller state.

The test

data register selected by the current instruction

retains its previous state. If J-TMS is held low

and a rising edge is applied to J-TCK when in

this state, the controller moves into the Capture-

DR state and a scan sequence for the selected

test data register is initiated. If J-TMS is held

high and a rising edge applied to J-TCK, the

controller moves to the Select-IR-Scan state.

The instruction does not change in this state.

Capture-DR State

In this state, the Boundary Scan Register cap-

tures input pin data if the current instruction is

EXTEST or SAMPLE/PRELOAD.

The other

test data registers, which do not have parallel in-

put, are not changed.

The instruction does not change in this state.

When the TAP controller is in this state and a

rising edge is applied to J-TCK, the controller

enters the Exit1-DR state if J-TMS is high or the

Shift-DR state if J-TMS is low.

Shift-DR State

In this controller state, the test data register con-

nected between J-TDI and J-TDO as a result of

the current instruction shifts data on stage to-

ward its serial output on each rising edge of

J-TCK.

The instruction does not change in this state.

When the TAP controller is in this state and a

rising edge is applied to J-TCK, the controller

enters the Exit1-DR state if J-TMS is high or re-

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

Exit1-DR State

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

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

T C K c au s es t h e c o n t rol ler to enter the

Update-DR 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-DR state.

Test-Logic-Reset

Run-Test/Idle

Select-DR-Scan

Capture-DR

Shift-DR

Exit1-DR

Pause-DR

Exit2-DR

Update-DR

Select-IR-Scan

Capture-IR

Shift-IR

Exit1-IR

Pause-IR

Exit2-IR

Update-IR

Figure 12. TAP Controller State Diagram

CS61583

DS172PP5

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