LUT6 instantiation support?

[peepo]

does Trellis/Yosys support LUT6 instantiation for ECP5?

as in: LUT6 #(
.INIT(64’h0000000000000000) // Specify LUT Contents
)
LUT6_inst (
.O(O), // LUT general output
.I0(I0), // LUT input
.I1(I1), // LUT input
.I2(I2), // LUT input
.I3(I3), // LUT input
.I4(I4), // LUT input
.I5(I5) // LUT input
);

or similar?

if not, is there an intention to, in the future?

AFAICT Lattice Diamond does, but am having other issues there...

Apologies as Google has not as yet provided a solution, and as I have not instantiated previously, it might be quite difficult to prove either way??

thanks again

[Ravenslofty]

This repo isn't checked very often; for something like this it would have been better to ask on YosysHQ/yosys.

Anyway, to answer your question: for the ECP5, we consider the maximum LUT size to be a LUT4, so for a LUT6, you would need to construct it out of 4 LUT4s, plus a layer of PFUMX to turn these into LUT5s, then a L6MUX21 to get your final LUT6.