any ideas why hand placing a tristate buffer isn't working for me? It only ever gives me x output. sky130_fd_sc_hd__ebufn_4 tri_buf ( .A( tri_in ), .Z(tri_out), .TE_B(!enable) ) https://github.com/mattvenn/tristate-test

@Matt Venn not sure, but perhaps power it?

there's a powered and unpowered version

but you have https://github.com/mattvenn/tristate-test/blob/690151d93dcacc8f8628eadf84b8cbb82f1ca9d3/test.v#L6

ahhh

I'm really just guessing here so I might be wrong

See 

sky130A/libs.ref/sky130_fd_sc_hd/verilog/sky130_fd_sc_hd.v

 line 93518. It's a bug in the PDK apparently? Try making it 

bufif0

instead.

same result

My bad; I misread it... It's perfectly fine.

maybe it's the power issue

Could you trying using that line instead of your

assign

statement?

?

Oh, I haven't seen that you have

USE_POWER_PINS

defined. It's probably that then. Sorry about the diversion...

yeah I get loads of errors without it