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| author | Sylvain Munaut <tnt@246tNt.com> | 2018-11-19 01:57:47 +0100 |
|---|---|---|
| committer | Sylvain Munaut <tnt@246tNt.com> | 2018-11-19 18:20:20 +0100 |
| commit | bc9f2da470b96c4e2f65324a0da1ffe099b5e586 (patch) | |
| tree | 7c05b3544a4ace9d69af28922751a5cd63d0d387 /ice40/arch_place.cc | |
| parent | 325d46e284fd7944b99929c1482e641a1db53931 (diff) | |
| download | nextpnr-bc9f2da470b96c4e2f65324a0da1ffe099b5e586.tar.gz nextpnr-bc9f2da470b96c4e2f65324a0da1ffe099b5e586.tar.bz2 nextpnr-bc9f2da470b96c4e2f65324a0da1ffe099b5e586.zip | |
ice40: Introduce the concept of forPadIn SB_GB
Those are cells that are created mainly to handle the various sources a
global network can be driven from other than a user net.
When the flag is set, this means the global network usually driven by
this BEL is in fact driven by something else and so that SB_GB BEL and
matching global network can't be used.
This is also what gets used to set the extra bits during bitstream
generation.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Diffstat (limited to 'ice40/arch_place.cc')
| -rw-r--r-- | ice40/arch_place.cc | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/ice40/arch_place.cc b/ice40/arch_place.cc index a09a5092..41f9b640 100644 --- a/ice40/arch_place.cc +++ b/ice40/arch_place.cc @@ -161,6 +161,8 @@ bool Arch::isValidBelForCell(CellInfo *cell, BelId bel) const return getBelPackagePin(bel) != ""; } else if (cell->type == id_SB_GB) { + if (cell->gbInfo.forPadIn) + return true; NPNR_ASSERT(cell->ports.at(id_GLOBAL_BUFFER_OUTPUT).net != nullptr); const NetInfo *net = cell->ports.at(id_GLOBAL_BUFFER_OUTPUT).net; IdString glb_net = getWireName(getBelPinWire(bel, id_GLOBAL_BUFFER_OUTPUT)); |