The LatticeECP3 LVDS input terminations on die include a midpoint connection to the bank VTT pins on the device. This is why it is recommended in the LatticeECP3 data sheet to leave the bank VTT pins floating when using LVDS input terminations and to ...
Unlike LatticeECP3 and LatticeSC families which have programmable termination for LVDS IO, LatticeECP2/M family does not have an on chip termination resistor for FPGA IO in LVDS input mode.
For generic FPGA input reference clock, DC coupling is what needs to be selected. The generic FPGA IO buffer architecture structure does not support AC coupling. Note: Dedicated SERDES reference clocks that have a CML buffer, can be AC or DC coupled. ...
Definition: Yes, Radiant and Diamond Software gives you the ability to generate IBIS model based on the user's design. Simply check "IBIS Model" in the Export options. After Export, the IBIS model can be found in the implementation folder. ...
Yes. When using the LVCMOS output settings with long 50 ohm PCB traces or cables, you will need to use the IO's higher output current settings and add an external 33 ohm series resistor for a good 50 ohm source termination with minimal ringing at the ...