參數(shù)資料
型號： DS26900LN+
廠商： Maxim Integrated Products
文件頁數(shù)： 19/49頁
文件大?。?/td> 0K
描述： IC JTAG MUX/SWITCH 144-LQFP
標準包裝： 90
系列： *
功能： *
電壓電源： 單電源
電壓 - 電源，單路/雙路(±)： 3.14 V ~ 3.47 V
電流 - 電源： *
工作溫度： *
安裝類型： 表面貼裝
封裝/外殼： 144-LQFP
供應商設備封裝： 144-LQFP（20x20）
包裝： 托盤
__________________________________________________________________________________________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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相關代理商/技術參數(shù)
參數(shù)描述
DS26900LN+ 功能描述:多路器開關 IC JTAG MUX RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16
DS26900N+ 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:JTAG Multiplexer/Switch
DS26C31 制造商:NSC 制造商全稱: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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