The POR defaults for LMX1906-SP EVM disables SYSREF, and other features. Only buffer mode & LOGICLK is active by default. Register settings must be updated to observe disabled features.
- Confirm the USB cable is connected to the EVM.
- Confirm the connection mode is SPI and the USB2ANY interface is indicated in green on the bottom bar.
- If multiple USB2ANY boards are connected, then
confirm that the correct USB2ANY is connected from USB Communications →
Interface pop-up by using the identify button.
- Make sure all registers have been loaded
(Ctrl+L), and that the device current has changed proportional to the number
of functional blocks enabled in the device.
- If a communication issue with the device is
suspected, then try toggling the POWERDOWN bit from the User Controls page
and observe the EVM current. Note that the first write to R0 after POR is
ignored. If the EVM current does not drop to about 58 mA after POWERDOWN is
set, then a communication issue can be preventing programming, or the IC can
be damaged.