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参数资料
| 型号： | DS26900LN+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/49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
24
The master grant signals,
MGNT0, MGNT1, and MGNT2, are generated by the master arbitrator. These signals are
available to the appropriate master to indicate that it has control. The
MCI output is asserted low to indicate this
possible conflict should more than one of the REQ signals be asserted low.
An active signal indicates the active (selected) device by asserting
ACT low. The ACT pin is asserted low under the
conditions listed in Table 4-3.
Table 4-3.
ACT Output States
M1 PIN
M0 PIN
INSTRUCTION REGISTER
VALUE
IS THERE AN
ACTIVE MASTER?
ACT
OUTPUT
0
0XXXX
Yes
0
1XXXX
Yes
1
0
1
0XXXX
Yes
0
1
1XXXX
Yes
1
0
0XXXX
Yes
1
0
1XXXX
Yes
0
1
XXXXX
X
1
X
XXXXX
No
1
X = Don’t care
4.2.1 Missing Test Master or Unused Test Master Port
An unused or missing test master has its
TMREQ signal tied high by the user (DS26900 has a pullup on that input
pin so the user can leave this pin unconnected), which puts that port into slave mode.
4.2.2 Detection of the Presence of Secondary Ports
The presence of secondary ports is detected by sensing the logic level present on the STMSn signal (the STMSn
signal on a port should have a pullup) on each secondary port and test master port. Logic 1 is latched into the
20-bit Port Detection Register (PDR) for each pullup that is sensed. The STMSn and TMSn signals are sensed and
the Port Detection Register (PDR) is updated each time the Switch TAP Controller passes out of the reset state.
(TMSn signals can only be sensed on TM1/TM2 slave-mode ports.)
4.2.3 Selection of the Secondary Port
Selection of the secondary port (“slave”) is accomplished by writing a 5-bit address into the Secondary Port
Selection Register (SPSR). Due to the star configuration, only one port can be selected at a time. Ports that are not
detected as being present by sensing the pullup on the secondary port’s TMS pin can still be selected, and the
signals will be sent to that port.
This 5-bit secondary port selection address is complemented and used to generate the selected slave port indicator
bits (
SSPI[4:0]). These bits can be used as a visual indicator as to which slave port has been selected.
Once communications with a secondary port has been completed, the Secondary Port Selection Register (SPSR)
should be set to all zeros. If not, the selected port address will not respond to the DPDV bit of the Device
Configuration Register (DCR). This is true if an active master is present or not.
4.2.4 Master Port/Secondary Port Path Timing Description
Each of the arbitrated masters passes into a 3 x 1 multiplexer and then a 1 x 20 multiplexer, such that any of the
three possible masters can connect to any of the 20 possible secondary ports (18 secondary ports plus the test
master ports when available). The test clock (TCK), test mode select (TMS), test data in (TDI), and test data out
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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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