DS2155LC1 Maxim Integrated, DS2155LC1 Datasheet - Page 202
DS2155LC1
Manufacturer Part Number
DS2155LC1
Description
Network Controller & Processor ICs
Manufacturer
Maxim Integrated
Datasheet
1.DS2155GNB.pdf
(238 pages)
- Current page: 202 of 238
- Download datasheet (2Mb)
Figure 34-2. TAP Controller State Diagram
34.2 Instruction Register
The instruction register contains a shift register as well as a latched parallel output and is 3 bits in length.
When the TAP controller enters the Shift-IR state, the instruction shift register is connected between JTDI
and JTDO. While in the Shift-IR state, a rising edge on JTCLK with JTMS LOW shifts the data one stage
toward the serial output at JTDO. A rising edge on JTCLK in the Exit1-IR state or the Exit2-IR state with
JTMS HIGH moves the controller to the Update-IR state. The falling edge of that same JTCLK latches
the data in the instruction shift register to the instruction parallel output. Instructions supported by the
DS2155 and its respective operational binary codes are shown in
1
0
Test Logic
Reset
Run Test/
Idle
0
1
0
1
Capture DR
Update DR
Pause DR
1
Select
DR-Scan
Exit2 DR
Shift DR
Exit DR
202 of 238
0
1
0
0
1
0
1
1
0
0
1
0
1
Capture IR
Update IR
1
Table
Pause IR
Select
IR-Scan
Shift IR
Exit2 IR
Exit IR
0
1
1
1
0
0
0
17-A.
1
1
0
0
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