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Emulation Design Considerations
Figure 15–12. EMU0/1 Configuration Without Global Stop
To Emulator
Note:
The open-collector driver and pullup resistor on EMU1 must be able to provide rising/falling edges of less than 25 ns.
Rising edges slower than 25 ns can cause the emulator to detect false edges during the RUNB command or when the
external counter selected from the debugger analysis menu is used. If this condition cannot be met, then the EMU0/1
signals from the individual boards should be ANDed together (as shown in Figure 15–10 ) to produce an EMU0/1 signal
for the emulator.
15-22
If having devices on one target board stopped by devices on another target
board via the EMU0/1 signals is not important, then the circuit in Figure 15–12
can be used. In this configuration, the global-stop capability is lost. It is impor-
tant not to overload EMU0/1 with more than 16 devices.
Pullup Resistor
EMU0/1
Pullup Resistor
. . .
EMU0/1
Device
Device
. . .
1
n
Target Board 1
Target Board m
Pullup Resistor
. . .
EMU0/1
Device
Device
. . .
1
n
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