Rainbow Electronics DS31256 - Manual (Page 164)

DS31256
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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. 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-Reset
Run-Test/Idle
Select
DR-Scan
1
0
Capture-DR
1
0
Shift-DR
0
1
Exit1-DR
1
0
Pause-DR
1
Exit2-DR
1
Update-DR
0
0
1
Select
IR-Scan
1
0
Capture-IR
0
Shift-IR
0
1
Exit1-IR
1
0
Pause-IR
0
Exit2-IR
1
Update-IR
0
0
1
0 0
1
0
1
0
1