Owner's manual

DS3131
156 of 174
12.2 TAP Controller State Machine Description
This section details the operation of the TAP controller state machine. See Figure 12-2 for details about
each of the states described below. The TAP controller is a finite state machine, which responds to the
logic level at JTMS on the rising edge of JTCLK.
Figure 12-2. TAP Controller State Machine
Test-Logic-Rese
t
Run-Test/Idle
Selec
t
DR-Scan
1
0
Capture-DR
1
0
Shift-D
R
0
1
Exit1-DR
1
0
Pause-D
R
1
Exit2-DR
1
Update-DR
0
0
1
Selec
t
IR-Scan
1
0
Capture-IR
0
Shift-I
R
0
1
Exit1-I
R
1
0
Pause-I
R
0
Exit2-I
R
1
Update-IR
0
0
1
00
1
0
1
0
1