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| 型号： | DS26900LN+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/49页 |
| 文件大小： | 0K |
| 描述： | IC JTAG MUX/SWITCH 144-LQFP |
| 标准包装： | 90 |
| 系列： | * |
| 功能： | * |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 3.14 V ~ 3.47 V |
| 电流 - 电源： | * |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 144-LQFP |
| 供应商设备封装： | 144-LQFP（20x20） |
| 包装： | 托盘 |
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__________________________________________________________________________________________DS26900
26
It can also be reset by asserting ETMS high for at least six clock cycles. The Switch TAP Controller should be
returned to the Test-Logic-Reset or Run-Test/Idle state before asserting
ECFG high.
To communicate with a particular secondary port, an address from 1 to 18 must be written into the 5-bit Secondary
Port Selection Register (SPSR) during the configuration mode. This address does not change unless it is
overwritten. However, toggling global rest (
RST) sets the Secondary Port Selection Register (SPSR) to 00000b. An
address of 00000b in the Secondary Port Selection Register (SPSR) (or any nonvalid port address) blocks
communications to all slave ports. Only one secondary port can be selected at a time.
4.7
Switch Configuration by Test Master 1 or Test Master 2
The master arbitration circuit determines which test master has priority. Test Master 1 (TM1) or Test Master 2
(TM2) configures the switch by asserting its
TMREQn low and TRSTn low. Access to the switch’s configuration
mode is accomplished by asserting
TRSTn low. While in configuration mode, the secondary slave ports’ JTAG
signals are asserted low (except
STRSTn signals, which are high) and do not toggle.
In configuration mode, the master has access to the configuration registers in the Switch TAP Controller in the
DS26900. When
TREQn is asserted low and a Secondary Port Selection Register (SPSR) address from 1 to 18
(34) is selected, the secondary port JTAG signal group toggles normally and the arbitrated test master acts as the
master.
The Switch TAP Controller operates as a IEEE 1149.1 TAP controller. Instructions can be written and registers
written or read using the 1149.1 state diagram. The Switch TAP Controller uses the inverted
TRSTn signal as reset.
It can also be reset by asserting TMSn high for at least six clock cycles. The Switch TAP Controller should be
returned to the Test-Logic-Reset or Run-Test/Idle state before asserting
TRSTn high.
To communicate with a particular secondary port, an address from 1 to 18 must be written into the 5-bit Secondary
Port Selection Register (SPSR) during the configuration mode. This address does not change unless it is
overwritten. However, toggling global rest (
RST) sets the Secondary Port Selection Register (SPSR) to 00000b. An
address of 00000b in the Secondary Port Selection Register (SPSR) (or any nonvalid port address) blocks
communications to all slave ports. Only one secondary port can be selected at any time.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS26900LN+ | 功能描述:多路器开关 IC JTAG MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| DS26900N+ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:JTAG Multiplexer/Switch |
| DS26C31 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:CMOS QUAD TRI-STATE DIFFERENTIAL LINE DRIVER |
| DS26C31 DIE | 制造商:Texas Instruments 功能描述: |
| DS26C31_BBA3026X WAF | 制造商:Texas Instruments 功能描述: |
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