MB2100-01A-E Single Port Embedded Emulator Debugger SPEED-BOX Operation Guide, Doc. # 002-05542 Rev. *A
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Connecting the SPEED-BOX
2.2
Connecting the SPEED-BOX to the user system
The SPEED-BOX connects to the user system using a debug interface cable. Mount a connector on
the user system that matches the cable to be used. Figure 2-2 shows the connection method.
Figure 2-2. Debug interface cable connection
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Hot plugging
This product supports hot plugging. Hot plugging refers to connecting and disconnecting the debug
interface cable while the power supply of one or both of the user system or SPEED-BOX is on.
However, if a procedure is specified for connecting the debugger using the debugging software, fol-
low this procedure.
When the SPEED-BOX power is on and the MDI bus is active, a bias voltage of 2.5V is applied to
the MDI pin ia an in-series resistance of approximately 100
. If the MCU MDI pin on the user system
has a pull-up resistance, then current may flow into the pull-up power source when the user system
power supply is disconnected, causing a voltage of 2.5V or less in the pull-up power source circuit. If
it is possible for this voltage to cause the user system to malfunction, then always activate the MDI
bus by following the debugging software directions. The specifications of the MDI bus are that it is
only active while the debugger is connected.
Note: If there is an electromotive force between the SG and FG on the user system, hot plug
operations are forbidden because of the risk of electrical shock.
User system
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