M66290AFP datasheet(54/54 Pages) RENESAS

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USB DEVICE CONTROLLER

M66290AGP/FP

MITSUBISHI <DIGITAL ASSP>

JTAG registers

Command registers

Command register is constituted by 3 bits register

which keeps command code, and is set in the IR

path sequence. Data register, which is selected in

the f ollowing path sequence, is determined by the

command which is set into the command register.

Initial v alue in test reset is IDCODE command.

Until the command code is set f rom external,

IDCODE register is kept selecting as the data

M66290A supports three commands (EXTEST,

SAMPLE/PRELOAD, and BYPASS) which are

established as essential by IEEE 1149.1 and the

dev ice recognize register access command

(IDCODE).

Below are the commands and the related code.

EXTEST (Command code : b'000)

Executes outside circuit connection test and on

board connection test. Reads the TDI input into the

"Boundary Scan Register" and outputs the contents

of "Boundary Scan Register" f rom TDO.

IDCODE (Command code : b'001)

Selects the "IDCODE Register" and outputs the

dev ice and company discrimination data f rom

TDO.

SAMPLE/PRELOAD (Command code : b'010)

Samples the circuit status in operation and outputs

it f rom TDO, and at the same time, inputs the data

f rom TDI which will be use in the next boundary

scan test and set into the "Boundary Scan Register"

prev iously .

BYPASS (Command code : b'111)

Selects the "BYPASS Register" and executes the

ref er and the set of the data.

Don't set the command code except f or abov e.

Data registers

(1) Boundary scan register (JTAGBSR)

This is f or boundary scan test and is assigned to each

terminal of M66290A which is related to JTAG.

Boundary scan register is connected between TDI and

TDO terminal, and is selected when "EXTEST Command"

is ordered. This register captures the status of input

terminal or the output v alue f rom internal logic circuit in

the state of C apture-DR. In the state of Shif t-DR, input

the data f or boundary scan test parallely outputting the

sampled v alue. And set terminal f unction (IN/OUT of

bidirectional terminal or direction of 3-state output) and

output v alue.

As to the JTAG related terminal and the structure of

boundary scan, ref er to BSDL specially.

(2) BYPASS register (JTAGBPR)

BYPASS register is one bit register to by pass the boundary

scan path when M66290A is not the object in boundary scan

test. BYPASS register is connected between TDI and TDO

terminal, and is selected when "BTPASS command" is

ordered. In the state of C apture-DR, "0" is loaded.

(4) IDCODE register (JTAGIDR)

IDCODE register is a register of 32bits to discriminate the

dev ice and the company , and keeps inf ormation as f ollows.

IDCODE register is connected between TDI and TDO

terminal,

and is selected when "IDCODE Command" is ordered.

IDCODE data is loaded in Capture-DR state and is output

f rom TDO in Shif t-DR state.

1. Version inf ormation (4bits)

2. Part number (16bits)

: b'0000

: b'0001 1000 1001 0010

(Binary code of "6290")

3. Company ID (11bits)

: b'000 0001 1100

(JEDEC code of MITSUBISHI)

4. LSB (1bit)

: b'1

(Fixed)

M66290AFP Datasheet(PDF) 54 Page - Renesas Technology Corp

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