Operation; Tap Controller; Figure 15.2 Tap Controller State Transitions - Renesas HD6417641 Hardware Manual

Section 15 User Debugging Interface (H-UDI)
15.4

Operation

15.4.1

TAP Controller

Figure 15.2 shows the internal states of the TAP controller. State transitions basically conform
with the JTAG standard.
1
Test-logic-reset
0
Run-test/idle
Note: The transition condition is the TMS value at the rising edge of TCK. The TDI value is
sampled at the rising edge of TCK; shifting occurs at the falling edge of TCK. For details
on change timing of the TDO value, see section 15.4.3, TDO Output Timing. The TDO is
at high impedance, except with shift-DR and shift-IR states. During the change to TRST =
0, there is a transition to test-logic-reset asynchronously with TCK.
Rev. 4.00 Sep. 14, 2005 Page 468 of 982
REJ09B0023-0400
0
Select-DR-scan
1
Capture-DR
0

Figure 15.2 TAP Controller State Transitions

1
0
0
Shift-DR
1
Exit1-DR
0
0
Pause-DR
1
Exit2-DR
1
Update-DR
1 0
1
Select-IR-scan
0
1
Capture-IR
0
0
Shift-IR
1
Exit1-IR
0
0
Pause-IR
1
0
Exit2-IR
1
Update-IR
1 0