pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 255

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

Revision 1.07
Embedded Controller Modules
For a detailed description of the controller states, see the IEEE 1149.1b-1994 specifications.
All state transitions of the TAP controller occur based on the value of TMS on the rising edge of TCK. TAP actions (described
in Sections 2.1.3 to 2.1.7) occur either on the rising or falling edge of TCK in each controller state, as shown in Figure 83.
1
0
Controller State
Tap-Reset
TCK
Run-Test
Idle
Note: The value for each state transition represents the signal on TMS
0
State Entered
for a rising edge at TCK.
Figure 83. Timing of Actions in a Controller State
1
Figure 82. TAP Controller State Diagram
1
0
Actions Occurring on the
(Continued)
Falling Edge of TCK
1
Capture-DR
Update-DR
Pause-DR
DR-Scan
Exit1-DR
Exit2-DR
Shift-DR
Select-
0
0
1
0
1
1
255
0
1
1
0
0
Actions Occurring on
Rising Edge of TCK
1
0
1
Capture-IR
Update-IR
Pause-IR
IR-Scan
Exit1-IR
Exit2-IR
Shift-IR
Select-
0
0
1
0
1
1
0
1
0
0
1
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