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| mithro | daveshah: Do you have an idea about the "ideal" way a counter should be packed on the ice40 architecture? | 16:18 |
|---|---|---|
| daveshah | mithro: not really, although iirc arachne-pnr's solution looked as good as any | 16:23 |
| mithro | daveshah: I'm trying to wrap my head around how a smart human would pack a counter into the tile | 16:23 |
| mithro | Welp, looks like I broke something | 16:26 |
| mithro | Total path delay: 1000004.78 ns (0.00 MHz) | 16:26 |
| mithro | :-P | 16:26 |
| daveshah | That means there's a logic loop | 16:27 |
| daveshah | Definitely shouldn't have one in a counter | 16:27 |
| mithro | daveshah: Yeah - I'm sure that I've broken the enable_ff somewhere | 16:27 |
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| mithro | daveshah: How does one enable the mux on lutff_i/in_3 to be driven by the carry output? | 17:34 |
| daveshah | mithro: It's a buffer bit in the icebox db | 17:35 |
| mithro | Ahh, it's considered part of the "routing" rather than the internal tile config stuff | 18:05 |
| daveshah | Yeah, same as the LUT cascade | 18:21 |
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