HD6417618 datasheet(540/646 Pages) RENESAS

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Section 19 User Debugging Interface (H-UDI)

Rev. 6.00 Jun. 12, 2007 Page 508 of 610

REJ09B0131-0600

Data loaded into the output pin boundary scan register in the Capture-DR state is not used for

external circuit testing (it is replaced by a shift operation).

The upper four bits of the instruction code are 0000.

IDCODE: A command can be set in SDIR by the H-UDI pins to place the H-UDI pins in the

IDCODE mode stipulated by JTAG. When the H-UDI is initialized (

TRST is asserted or TAP is in

the Test-Logic-Reset state), the IDCODE mode is entered.

CLAMP, HIGHZ: A command can be set in SDIR by the H-UDI pins to place the H-UDI pins in

the CLAMP or HIGHZ mode stipulated by JTAG.

19.5.2

Points for Attention

• Boundary scan mode does not cover clock-related signals (EXTAL, XTAL, CKIO, and

CK_PHY).

• Boundary scan mode does not cover system- and E10A-related signals (RES and ASEMD).

• Boundary scan mode does not cover H-UDI-related signals (TCK, TDI, TDO, TMS, and

TRST).

• When the EXTEST, CLAMP, and HIGHZ commands are set, fix the RES pin low.

• When a boundary scan test for other than BYPASS and IDCODE is carried out, fix the

ASEMD pin high.

19.6

Usage Notes

• An H-UDI command, once set, will not be modified as long as another command is not re-

issued from the H-UDI. If the same command is given continuously, the command must be set

after a command (BYPASS, etc.) that does not affect LSI operations is once set.

• Because LSI operations are suspended in standby mode, H-UDI commands are not accepted.

To hold the state of the TAP before and after standby mode, the TCK signal must be high

during standby mode transition.

• The H-UDI is used for emulator connection. Therefore, H-UDI functions cannot be used when

using an emulator.

HD6417618 Datasheet(PDF) 540 Page - Renesas Technology Corp