Renesas SH7781 - Manual (Page 1535)

30. User Debugging Interface (H-UDI)
Rev.1.00 Jan. 10, 2008 Page 1505 of 1658
REJ09B0261-0100
30.4.2 TAP Control
Figure 30.3 shows the internal states of the TAP controller. The controller supports the state
transitions specified in JTAG with the subset.
• The condition of transition is the TMS value at the rising edge of TCK.
• The TDI value is sampled at the rising edge of TCK and shifted at the falling edge of TCK.
• The TDO value is changed at the falling edge of TCK. The TDO is in the high impedance state
other than in the Shift-DR or Shift-IR state.
• When TRST is changed to 0, the transition to the Test-Logic-Reset state is performed
asynchronously with the TCK signal.
Test -Logic-Reset
Capture-DR
Shift-DR
Exit1-DR
Pause-DR
Exit2-DR
Update-DR
Select-DR-Scan Run-Test/Idle
1
0
0
0
0
1 1 1
1
0
0
0
1
1 1
0
1
1
1 0
Capture-IR
Shift-IR
Exit1-IR
Pause-IR
Exit2-IR
Update-IR
Select-IR-Scan
0
0
1
0
0
0
1
0
1
1
1 0
Figure 30.3 Diagram of Transitions of TAP Controller State