Friday, 2019-04-19

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elmsdaveshah: Do you know the source of the ice40 timing models used by nextpnr? May be I'm missing the link between icestorm's timing data.20:54
daveshahelms: see https://github.com/YosysHQ/nextpnr/blob/master/ice40/chipdb.py#L41020:55
tpbTitle: nextpnr/chipdb.py at master · YosysHQ/nextpnr · GitHub (at github.com)20:55
daveshahand https://github.com/YosysHQ/nextpnr/blob/master/ice40/chipdb.py#L22920:55
tpbTitle: nextpnr/chipdb.py at master · YosysHQ/nextpnr · GitHub (at github.com)20:55
elmsdaveshah: thanks20:57
elmsdaveshah: what about the models in delay.cc https://github.com/YosysHQ/nextpnr/blob/master/ice40/delay.cc#L126 ?20:58
tpbTitle: nextpnr/delay.cc at master · YosysHQ/nextpnr · GitHub (at github.com)20:58
daveshahThey are delay estimates used during placement20:59
daveshahI think clifford used https://github.com/YosysHQ/nextpnr/blob/master/ice40/tmfuzz.py to create it20:59
tpbTitle: nextpnr/tmfuzz.py at master · YosysHQ/nextpnr · GitHub (at github.com)20:59
elmsdaveshah: that looks like it may be. Thanks21:01
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