REVISION B 04/01/15
15
EVK-UFT285-6-7 EVALUATION BOARD USER GUIDE
EEPROM Boot
The evaluation board ships with an IDT8T49N286-997device, which will attempt to boot from the EEPROM at power-up. By
default, the EEPROM boot is not enabled on the board. If use of the EEPROM boot is required, there are three options to enable
this mode.
1)
No Rework Option.
This option will enable the EEPROM boot and does not require any soldering. This sequence must
be performed each time the EEPROM needs to be reloaded into the device.
a. Hold down the reset button.
b. Unplug and then plug in the USB cable.
c. Release the reset button.
2)
Rework Option.
This option will enable the EEPROM boot but requires soldering. It does not require continually
unplugging/plugging-in the USB cable for reloading of the EEPROM into the device.
a. Remove LD10 or replace R156 with a 1Kohm resistor. (See
Figure 6
).
b. Power up the board with USB cable connected.
c. Press and release the reset button.
3)
Stand-Alone Use.
Sometimes it's necessary to evaluate the device inside a temperature chamber, a system rack, or a
Faraday cage where a USB connection to the device is impractical. For such cases contact IDT for further support.
For details on how to program the EEPROM, please refer to document
How to Program the 8T49N28x EEPROM
.
DC Controls
The Dip Switch has three settings: 0V, Float, and VCC. This board ships with all switches in the Float (middle) position. Refer to
Figure 1
, label "A" for the location of the Dip Switch.
Содержание EVK-UFT285-6-7
Страница 6: ...REVISION B 04 01 15 6 EVK UFT285 6 7 EVALUATION BOARDUSERGUIDE Figure 4 Output Termination Schematic...
Страница 7: ...REVISION B 04 01 15 7 EVK UFT285 6 7 EVALUATION BOARDUSERGUIDE Figure 5 Crystal Interface Schematic...
Страница 9: ...REVISION B 04 01 15 9 EVK UFT285 6 7 EVALUATION BOARDUSERGUIDE Figure 8 VCCO Power Filtering...
