Analog Devices HPPCI, Руководство пользователя

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HPUSB, USB, and HPPCI Emulators User’s Guide 1-13

Getting Started
Legacy Mode (Factory Default Setting)
Legacy mode is used for older targets that do not support voltages less
than 3.3V and do not provide an IOVDD input for automatic voltage
detection by the pod. Consequently, the emulator in legacy mode is used
for all previously designed 3.3V and 5V target boards. The HPPCI-ICE is
3.3V compliant and 5.0V tolerant in this mode and accepts both 3.3V
and 5.0V signals but only drives 3.3V CMOS level signals. In legacy
mode, the LED labeled
3.3/5V is lit.
The emulator is set to Legacy mode before leaving the factory. The switch
must be set in the manner shown in
Figure 1-8 to verify that the emulator
is in legacy mode, or to change the emulator to legacy mode.
Figure 1-7. Default Switch Setting for HPPCI-ICE Pod