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Artix 200T missing bits #1750
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The image below is from a dcp obtained with the yosys-vivado toolchain in FPGA-tool-perf. The highlighted nets are the CLKIN and CLKOUTs nets that go to/from the PLL in the X1Y0 cmt. The unknown GTP bits are highlighted in the image below, and we are indeed missing those. Given that the routing step passes correctly in VPR, I think that the RR nodes passing through the GTP tile are correctly connected, but we have some missing bits for those pips. |
MMCM tile |
@mkurc-ant - What do we need to do to enable the |
@mithro I don't know why they are disabled now. A preliminary test I've done shows that the fuzzer solves them successfully. Haven't checked for potential bit conflicts though. |
This should solve the unknown MMCM PIPs: f4pga/prjxray#1498 |
Perfect. The bits to solve now are related to the pips in the Instead, for the 200T, the I am trying to run the fuzzers for the 200T, and see if we can transition to that part in prjxray. This would give us the possibility to write a fuzzer to get the missing bits for those pips (visible in the above screenshot) |
I have a finding. So the I'm not entirely sure how we model bi-directional PIPs in VPR. One solution that comes into my mind is to have two entries per bi-dir PPIP for both directions. |
While adding designs in fpga-tool-perf for the nexys_video board, the following error showed up.
The problem, as far as I understood, might be related to the fact that the bottom and top rows of the 200T have a non-common structure, with the
GTP_COMMON_MID
tile in the middle of the row.Placing the PLL elsewhere, avoiding the top and bottom rows seems to solve the issue.
A similar issue was filed, and I believe we are hitting the same kind of problem here: #1489
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