MAXIM復(fù)用開(kāi)關(guān)的解決方案
來(lái)源：互聯(lián)網(wǎng) | 作者:中華IC網(wǎng)整理 | 發(fā)表于：2013-08-23
DS26900是一款JTAG信號(hào)復(fù)用器，能夠?qū)?路主機(jī)端口之一連接到18路(36路級(jí)聯(lián)配置)次級(jí)端口。該器件可以通過(guò)三個(gè)主機(jī)端口中的任意一路進(jìn)行配置。DS26900可自動(dòng)檢測(cè)次級(jí)端口JTAG器件的連接狀態(tài)。
基本特征：
DS26900是一款JTAG信號(hào)復(fù)用器，能夠?qū)?路主機(jī)端口之一連接到18路(36路級(jí)聯(lián)配置)次級(jí)端口。該器件可以通過(guò)三個(gè)主機(jī)端口中的任意一路進(jìn)行配置。DS26900可自動(dòng)檢測(cè)次級(jí)端口JTAG器件的連接狀態(tài)。
方案特點(diǎn)：
Ribbon Cable Connectors for Master and
Secondary JTAG Port Connections
Jumpers for Device Configuration
LEDs for Device State Outputs
Simple Power Connections
The simplest configuration to test for communication with the DS26900 demo kit is to connect a JTAG source to master port 1, connect power, and, using JTAG sequences, manipulate some of the device state output LEDs on the board. The SSPIx LEDs can be used to verify that the desired secondary port is being selected. The GPIOx LEDs can be observed to verify that the GPIO pins are being correctly selected.
Some signals available at these
connectors can be controlled dynamically from the connector or from jumpers.
When driving a signal from the master port connectors the jumper can be removed or
placed in a pullup or pulldown position determined by the method of driving the signal.
參考原理圖：
圖1
圖2
圖3
