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| awygle | i can't trick nmigen/nextpnr into letting me route the ecp5 memory phy. if i connect the DSI input of DQSBUFM, the Q output of TSHX2DQSA, and the Q output of ODDRX2DQSB to the pin directly, i get a multiple driver error, but if i try to put a BB bidirectional buffer in the obvious place, i get "DQSI must be connected to a top-level input" | 06:17 |
|---|---|---|
| awygle | what am i doing wrong here? | 06:17 |
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| awygle | oh my god i needed to switch the I and the O of the BB | 06:50 |
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| mangelis | i wonder why yosys sometimes synthesizes $_SDFF_PP1_ cells? according to https://github.com/YosysHQ/yosys/blob/5aa35b8992fab8b55c1c1fae793b4ad845fd4c4c/techlibs/common/simcells.v#L2076 they could be just represented with a lut followed by a flipflop | 07:39 |
| mangelis | i mean, what's the benefit of having such primitive? | 08:03 |
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| nick_ | Hi, I just got a simple project running on an ICE40-HX8K breakout board | 11:58 |
| nick_ | How can I tell the utilisation of the FPGA? | 11:58 |
| tnt | read the nextpnr report ? | 12:25 |
| tnt | somewhat early, before placing, it will print the packing results with resource usage. | 12:26 |
| * nick_ found icebox_stat which I assume is half of what I was looking for | 12:38 | |
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| Lofty | nick_: really, nextpnr tells you the utilisation information | 15:32 |
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