IDT82V2048 Integrated Device Technology, Inc., IDT82V2048 Datasheet - Page 44

• Manufacturer Part Number: IDT82V2048
• Manufacturer: Integrated Device Technology, Inc.

IDT82V2048 OCTAL T1/E1 SHORT HAUL LINE INTERFACE UNIT
TABLE - 21. TAP CONTROLLER STATE DESCRIPTION (CONTINUED)
Update-IR
Pause-IR
Exit1-IR
Exit2-IR
STATE
enter the Update-IR state, which terminates the scanning process. If TMS is held low and a rising edge is applied to TCK, the
controller enters the Pause-IR state. The test data register selected by the current instruction retains its previous value and
the instruction does not change during this state.
data register selected by the current instruction retains its previous value and the instruction does not change during this
state. The controller remains in this state as long as TMS is low. When TMS goes high and a rising edge is applied to TCK,
the controller moves to the Exit2-IR state.
enter the Update-IR state, which terminates the scanning process. If TMS is held low and a rising edge is applied to TCK, the
controller enters the Shift-IR state. The test data register selected by the current instruction retains its previous value and the
instruction does not change during this state.
The instruction shifted into the instruction register is latched into the parallel output from the shift-register path on the falling
edge of TCK. When the new instruction has been latched, it becomes the current instruction. The test data registers selected
by the current instruction retain their previous value.
The pause state allows the test controller to temporarily halt the shifting of data through the instruction register. The test
This is a temporary state. While in this state, if TMS is held high, a rising edge applied to TCK causes the controller to
This is a temporary state. While in this state, if TMS is held high, a rising edge applied to TCK causes the controller to
1
0
Test-logic Reset
Run Test/Idle
0
1
Figure - 22. JTAG State Diagram
1
0
Capture-DR
Update-DR
Select-DR
Pause-DR
Exit1-DR
Exit2-DR
Shift-DR
1
44
1
0
1
DESCRIPTION
0
0
1
0
1
1
0
0
0
1
Capture-IR
Update-IR
Pause-IR
Select-IR
Exit1-IR
Exit2-IR
Shift-IR
1
INDUSTRIAL TEMPERATURE RANGES
1
0
1
1
0
0
0
1
0
1
0