M66290AFP datasheet(53/54 Pages) RENESAS

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USB DEVICE CONTROLLER

M66290AGP/FP

MITSUBISHI <DIGITAL ASSP>

Pause-IR

Update-IR

A/B

Shift-DR/IR

Clock-DR/IR

Update-DR/IR

Exit2-IR

Exit1-IR

Shift-IR

Capture-IR

Select-IR-Scan

Exit2-IR

Select-DR-Scan

Capture-DR

Shift-DR

Exit1-DR

Pause-DR

Exit2-DR

Update-DR

Test-Logic-Reset

Run-Test-/Idle

Data input

From previous

cell

Input select

Test reset

Parallel output

stage

Data output

To next cell

Shift register

stage

note: 0,1 shows the status of TMS input signal

Figure. Status shif t of TAP controller

Abstract of JTAG operations

There are f our basic access to command register

and to data register. And the access is executed

based on the status shif t of TAP controller.

TAP controller is shif ted of its status by the TMS

input and make a control signal which is needed to

each state.

Capture operation

Result of the boundary scan test or the f ixed

data which is def ined to each register, is sampled.

For operation, load the input data into shif t register

stage.

Shif t operation

Through the boundary scan path, access f rom external

is done. M66290A set the data f rom external and at the

same time, output the data which is sampled by capture

operation.

For register operation, right shif t is executed among

shif t register stage of each bit.

Figure. Basic construction of JTAG related register

IR path sequence

Update operation

In shif t operation, driv e the data which is set by external.

For register operation, transf er the v alue which is set to

shif t register stage, to parallel output stage.

JTAG interf ace shif ts the internal state according to TMS

input, and do two kinds of operations as f ollows. Both are

basically

executed in turn of "Capture -> Shif t -> Update".

Set the command code into command register and when

path sequence comes, select the data register which is

the object of the operation.

DR path sequence

To selected data register, ref er or set the data.

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