Troubleshooting; Leds Do Not Flash; Usb Cable Not Detected; Accessing The Troubleshooting The Usb Driver Installation Guide - Lattice Semiconductor MachXO2 User Manual

MachXO2 and MachXO3 Starter Kit Evaluation Board User Guide
Evaluation Board User Guide

8. Troubleshooting

Use the tips in this section to diagnose problems with the Starter Kit.

LEDs Do Not Flash

If power is applied but the board does not flash according to the preprogrammed counter demonstration, then it is
likely the board has been reprogrammed with a new design. Follow the directions in the
to restore the factory default.

USB Cable Not Detected

If Lattice Diamond Programmer or ispVM System does not recognize the USB cable after installing the Lattice USB port
drivers and rebooting, the incorrect USB driver may have been installed. This usually occurs if you attach the board to
your PC prior to installing the Lattice-supplied USB driver.

Accessing the Troubleshooting the USB Driver Installation Guide

To access the installation guide for Diamond software and standalone Diamond Programmer:
1. Start Diamond or Diamond Programmer and choose Help.
7. Search for USB driver or Troubleshooting, then select the Troubleshooting the USB Driver topic.
8. Follow the directions to install the Lattice USB driver.
To access the installation guide for ispVM:
1. Start ispVM System and choose Options > Cable and I/O Port Setup. The Cable and I/O Port Setup Dialog appears.
9. Click the Troubleshooting the USB Driver Installation Guide link. The Troubleshooting the USB Driver
Installation Guide document appears in your system's PDF file reader.
10. Follow the directions to install the Lattice USB driver.
An alternate failure mode can occur when the user design assigns an output signal to the FPGA package pin C8 which
is connected the oscillator (X1) output signal 12 MHz. This can occur unintentionally when the Placer randomly assigns
unconstrained outputs. In this case, the contention squelches the FTDI device (U1) clock input, rendering it unable to
communicate. To eliminate the contention, remove the resistor R23. This restores the FTDI device operation and allow
the erasure of the offending FPGA image. Resistor R23 should be reinstalled if an external clock source is desired.

Restoring Original Demo Design

If the Starter Kit has been reprogrammed, the original demo design can be restored. To restore the board to the factory
default, see the Download Demo Designs
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section for details on downloading and reprogramming the device.
Demonstration Design section
FPGA-EB-02036-1.4