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| so-offish | Ok everybody: I built an 8:1 mux out of 4 TRELLIS_COMB elements. To do this, I used PFUMX and L6MUX21 components within the TRELLIS_COMB, and wired them up. It works in simulation - but BREAKS THE PLACER (unable to find legal placement for 'COMB3'). Can someone tell me which TRELLIS_COMB cells can use the IS_Z1=1'b1? I think that's the issue with that block - which TRELLIS_COMB has the L6MUX21? | 19:42 |
|---|---|---|
| so-offish | Actually I'm not even sure that's the issue, but that's the only block where I used IS_Z1=1'b1 so I think that's it | 19:46 |
| so-offish | I just need the tightest mux I can with the ability to move it around programmatically with placement constraints. The PFUMX and the L6MUX21 look like components which are generated by Yosys, but then the packer finds a place for them within a TRELLIS_COMB. I guess I should look at the code for the packer to figure out what I did wrong... | 19:49 |
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