參數(shù)資料
型號: DS3160
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 87/107頁
文件大小: 592K
代理商: DS3160
DS3160
87 of 107
9.2 TAP Controller State Machine Description
This section covers the details about the operation of the test-access-port (TAP) controller state machine. The
TAP controller is a finite state machine that responds to the logic level at JTMS on the rising edge of JTCLK.
Figure 9.2A. TAP CONTROLLER STATE MACHINE
Test-Logic-Reset
Upon power-up of the DS3160, the TAP controller is in the Test-Logic-Reset state. The instruction register
contains the IDCODE instruction. All system logic on the DS3160 operates normally.
Run-Test-Idle
Run-Test-Idle is used between scan operations or during specific tests. The instruction register and test register
remain idle.
Select-DR-Scan
All test registers retain their previous state. With JTMS low, a rising edge of JTCLK moves the controller into the
Capture-DR state and initiates a scan sequence. JTMS high moves the controller to the Select-IR-SCAN state.
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
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