32186 datasheet(902/1032 Pages) RENESAS

902 / 1032 page

JTAG

21-8

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

JTCK

Don't Care

Instruction code (6 bits)

LSB value

MSB value

JTMS

TAP

states

JTDI

JTDO

High impedance

Shift output from the instruction

Finished storing instruction code in the

instruction register's shift register stage.

Instruction code is set in the parallel output

stage at fall of JTCK in the Update-IR state.

JTDI input is sampled at rise of

JTCK in the Shift-IR state.

JTDO is output at fall of

JTCK in the Shift-IR state.

Figure 21.4.3 IR Path Sequence

21.4 Basic Operation of JTAG

21.4.2 IR Path Sequence

Instruction code is set in the Instruction Register (JTAGIR) to select the data register to be accessed in the

subsequent DR path sequence. The IR path sequence is performed following the procedure described below.

(1) From the Run-Test/Idle state, apply JTMS = "H" for a period of 2 JTCK cycles to enter the Select-IR-

Scan state.

(2) Apply JTMS = "L" to enter the Capture-IR state. At this time, b’110001 (fixed value) is set in the

Instruction Register’s shift register stage.

(3) Proceed and apply JTMS = "L" to enter the Shift-IR state. In the Shift-IR state, the value of the shift

(2) is serially output from the JTDO pin. At the same time, instruction code is set in the shift register

stage bit by bit as it is serially fed from the JTDI pin. Because the instruction code is set in the

Instruction Register that consists of 6 bits, the Shift-IR state must be continued for a period of 6

JTCK cycles. To stop the shift operation in the middle of the execution, enter the Pause-IR state via

the Exit1-IR state (by setting JTMS input from "H" to "L"). To return from the Pause-IR state, enter

the Shift-IR state via the Exit2-IR state (by setting JTMS input from "H" to "L").

(4) Apply JTMS = "H" to move from the Shift-IR state to the Exit1-IR state. This completes the shift operation.

(5) Proceed and apply JTMS = "H" to enter the Update-IR state. In the Update-IR state, the instruction

code that was set in the Instruction Register’s shift register stage is transferred to the Instruction

(6) Proceed and apply JTMS = "H" to enter the Select-DR-Scan state or JTMS = "L" to enter the Run-

Test/Idle state.

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