MAX16067 datasheet(38/47 Pages) MAXIM

Part #	MAX16067

Description	6-Channel, Flash-Configurable System Manager with Nonvolatile Fault Registers

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Manufacturer	MAXIM [Maxim Integrated Products]

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38 _____________________________________________________________________________________

6-Channel, Flash-Configurable System Manager

with Nonvolatile Fault Registers

Figure 14. Tap Controller State Diagram

Test Access Port (TAP)

Controller State Machine

The TAP controller is a finite state machine that responds

to the logic level at TMS on the rising edge of TCK. See

Figure 14 for a diagram of the finite state machine. The

possible states are described as follows:

Test-Logic-Reset: At power-up, the TAP controller

is in the test-logic-reset state. The instruction register

contains the IDCODE instruction. All system logic of the

device operates normally. This state can be reached

from any state by driving TMS high for five clock cycles.

Run-Test/Idle: The run-test/idle state is used between

scan operations or during specific tests. The instruction

register and test data registers remain idle.

Select-DR-Scan: All test data registers retain their previ-

ous state. With TMS low, a rising edge of TCK moves the

controller into the capture-DR state and initiates a scan

sequence. TMS high during a rising edge on TCK moves

the controller to the select-IR-scan state.

Capture-DR: Data can be parallel-loaded into the test

data registers selected by the current instruction. If the

instruction does not call for a parallel load or the selected

test data register does not allow parallel loads, the test

data register remains at its current value. On the rising

edge of TCK, the controller goes to the shift-DR state if

TMS is low or it goes to the exit1-DR state if TMS is high.

Shift-DR: The test data register selected by the current

instruction connects between TDI and TDO and shifts

data one stage toward its serial output on each rising

edge of TCK while TMS is low. On the rising edge of TCK,

the controller goes to the exit1-DR state if TMS is high.

Exit1-DR: While in this state, a rising edge on TCK puts the

controller in the update-DR state. A rising edge on TCK with

TMS low puts the controller in the pause-DR state.

Pause-DR: Shifting of the test data registers halts while

in this state. All test data registers retain their previous

state. The controller remains in this state while TMS is

low. A rising edge on TCK with TMS high puts the con-

troller in the exit2-DR state.

Exit2-DR: A rising edge on TCK with TMS high while in

this state puts the controller in the update-DR state. A ris-

ing edge on TCK with TMS low enters the shift-DR state.

TEST-LOGIC-RESET

1

0

RUN-TEST/IDLE

0

1

0

1

0

1

0

1

0

1

SELECT-DR-SCAN

SELECT-IR-SCAN

CAPTURE-DR

CAPTURE-IR

SHIFT-DR

SHIFT-IR

EXIT1-DR

EXIT1-IR

PAUSE-DR

PAUSE-IR

EXIT2-DR

EXIT2-IR

UPDATE-DR

UPDATE-IR

0

1

0

1

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