参数资料
型号: DS26900LN+
厂商: Maxim Integrated Products
文件页数: 15/49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
__________________________________________________________________________________________DS26900
22
4.1.3 Deselect Mode and Redundancy
Deselect Mode allows multiple devices to be connected in parallel with the use of external logic controlling the
M[1:0] and PREN pins. Deselect Mode is enabled when the mode pins (M[1:0]) are both set high. This internally
forces the
TMREQ1, TMREQ2, and EREQ signals to go high, causing the DS26900 to act as though no active
master is present. When both mode pins are set low via the external select logic, the device is selected and
operated in Single-Package Mode.
Applications requiring device redundancy can be achieved by asserting
PTRST low and HIZ low. This causes
outputs to become high impedance and disables the pullups and pulldowns. During normal operation,
PTRST is
asserted low and
HIZ is asserted high.
A device that is deselected (M[1:0] = 11) internally acts as if an arbitrated master is not present. The Switch TAP
Controller goes into Test-Logic-Reset (and the instruction register is cleared). The other programmable registers
are left unchanged.
Figure 4-4. Three Cascaded Devices Using External Select Logic
DS26900
ETM
TM1
TM2
SECONDARY 1
SECONDARY 18
PREN
M[1:0] = 00/11
VDD
EXTERNAL
TEST MASTER
TEST MASTER 1
TEST MASTER 2
6
ETM
TM1
TM2
PREN
SECONDARY 1
SECONDARY 18
DS26900
5
INSTRUCTION CODE = "0xxxx"
ETM
TM1
TM2
PREN
SECONDARY 1
SECONDARY 18
DS26900
5
INSTRUCTION CODE = "0xxxx"
M[1:0] = 00/11
MODE
SELECT
LOGIC
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