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| daveshah | Am I right in saying that based on https://github.com/SymbiFlow/prjxray/blob/master/fuzzers/074-dump_all/artix7_ignored_wires.txt ; the IOI2GCLK wires are currently broken in the xray database? | 19:10 |
|---|---|---|
| tpb | Title: prjxray/artix7_ignored_wires.txt at master · SymbiFlow/prjxray · GitHub (at github.com) | 19:10 |
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| litghost | daveshah: One minute. I believe what you are seeing there is the tiles that are not above/below the middle of the CMT, and therefore no IOI2GCLK connection exists | 22:21 |
| daveshah | Thanks! I was seeing some odd behaviour and what looked at a glance like a mismatch between how nextpnr was routing things and Vivado and didn't want too spend too much time on it if there was an xray issue | 22:27 |
| daveshah | I can look into it some more tomorrow though | 22:28 |
| litghost | daveshah: So I took a look, and I think it kind of works out | 22:28 |
| litghost | daveshah: At a minimum the CCIO pins that are directly above and below the CMT middle are okay | 22:29 |
| litghost | daveshah: It is possible that the CCIO pins that 2 above and below the CMT are missing their connections | 22:29 |
| litghost | daveshah: I'll look into the connection database for the a7 and see | 22:29 |
| litghost | daveshah: In particular the line "LIOI3_TBYTESRC_X0Y19/LIOI_I2GCLK_TOP1" may mean that the node "LIOI3_X0Y21/LIOI_I2GCLK_TOP0" is not probably preserved | 22:30 |
| daveshah | The problematic pin was RIOI3_X43Y67 (clock input for Arty A35T) | 22:31 |
| litghost | daveshah: That tile is not a CCIO pin, so it lacks a IOI2GCLK wire | 22:31 |
| daveshah | oh, sorry, typo | 22:32 |
| litghost | daveshah: Only the first two IOB33M pins above and below the CMT are CCIO pins | 22:32 |
| litghost | daveshah: Am I missing something? | 22:32 |
| daveshah | I copied the reset pin instead. I meant X43Y75 | 22:32 |
| daveshah | That's not in the list, so it should work fine | 22:33 |
| daveshah | I'll have more of a look tomorrow | 22:33 |
| daveshah | thanks for your help! | 22:33 |
| litghost | daveshah: So that is the first IOB33M above the CMT, so I expect it should be okay? | 22:33 |
| litghost | daveshah: I'll check my database and see | 22:33 |
| daveshah | https://usercontent.irccloud-cdn.com/file/uqnuFRMX/Screenshot%20from%202020-01-16%2022-32-34.png | 22:34 |
| daveshah | this is the route that Vivado uses, fwiw | 22:34 |
| daveshah | It's not a blocking issue as using general routing seems to work fin | 22:34 |
| litghost | I'm checking my database to see | 22:35 |
| litghost | https://gist.github.com/litghost/78c03fccab50e16bb82a9ba31cc2ce6e | 22:38 |
| tpb | Title: gist:78c03fccab50e16bb82a9ba31cc2ce6e · GitHub (at gist.github.com) | 22:38 |
| litghost | So from symbiflow-arch-defs interpretation of the prjxray-db, that node is correct | 22:38 |
| daveshah | Ack, I suspect it is something odd with how I'm importing the database. I'll check when I'm back at my desk tomorrow | 22:39 |
| litghost | daveshah: I checked LIOI3_X0Y21/LIOI_I2GCLK_TOP0, and it looks good too: https://gist.github.com/litghost/9c65c6a726ecda42cd3ea191307dc059 | 22:45 |
| tpb | Title: gist:9c65c6a726ecda42cd3ea191307dc059 · GitHub (at gist.github.com) | 22:45 |
| litghost | daveshah: So I believe the CCIO nodes should be okay. If you have another node you suspect is a problem, do let me know | 22:45 |
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