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| 型号： | DS21Q44T+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 78/105页 |
| 文件大小： | 0K |
| 描述： | IC FRAMER ENHANCED E1 4X 128TQFP |
| 标准包装： | 72 |
| 控制器类型： | E1 调帧器 |
| 接口： | 并行/串行 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 75mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 128-LQFP |
| 供应商设备封装： | 128-LQFP（14x20） |
| 包装： | 管件 |
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DS21Q44
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17.2 TAP Controller State Machine
This section covers the details on the operation of the Test Access Port (TAP) Controller State Machine.
Please see Figure 17.2 for details on each of the states described below.
TAP Controller
The TAP controller is a finite state machine that responds to the logic level at JTMS on the rising edge of
JTCLK.
Test-Logic-Reset
Upon power-up of the DS21Q44, the TAP Controller will be in the Test-Logic-Reset state. The
Instruction register will contain the IDCODE instruction. All system logic of the DS21Q44 will operate
normally.
Run-Test-Idle
The Run-Test-Idle is used between scan operations or during specific tests. The Instruction register and
Test registers will 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 will initiate a scan sequence. JTMS HIGH during a rising edge
on JTCLK moves the controller to the Select-IR
Capture-DR
Data may be parallel-loaded into the Test Data registers selected by the current instruction. If the
instruction does not call for a parallel load or the selected register does not allow parallel loads, the Test
register will remain at its current value. On the rising edge of JTCLK, the controller will go to the Shift-
DR state if JTMS is low or it will go to the Exit1-DR state if JTMS is high.
Shift-DR
The Test Data register selected by the current instruction will be connected between JTDI and JTDO and
will shift data one stage towards its serial output on each rising edge of JTCLK. If a Test Register
selected by the current instruction is not placed in the serial path, it will maintain its previous state.
Exit1-DR
While in this state, a rising edge on JTCLK with JTMS high will put the controller in the Update-DR
state, and terminate the scanning process. A rising edge on JTCLK with JTMS low will put the controller
in the Pause-DR state.
Pause-DR
Shifting of the test registers is halted while in this state. All Test registers selected by the current
instruction will retain their previous state. The controller will remain in this state while JTMS is low. A
rising edge on JTCLK with JTMS high will put the controller in the Exit2-DR state.
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| DS21Q48A3N | 功能描述:网络控制器与处理器 IC 5V Quad E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q48B | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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