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| author | gatecat <gatecat@ds0.me> | 2022-06-23 18:48:31 +0100 |
|---|---|---|
| committer | gatecat <gatecat@ds0.me> | 2022-07-08 14:30:57 +0200 |
| commit | 09e388f453d9cf998391495349c88e5478b62e34 (patch) | |
| tree | 004f2b14ed5a3b0584c4998d9f0a5598cc52ab28 /generic | |
| parent | 86396c41d64d2583ec1dffca4298e83d927f0762 (diff) | |
| download | nextpnr-09e388f453d9cf998391495349c88e5478b62e34.tar.gz nextpnr-09e388f453d9cf998391495349c88e5478b62e34.tar.bz2 nextpnr-09e388f453d9cf998391495349c88e5478b62e34.zip | |
netlist: Add PseudoCell API
When implementing concepts such as partition pins or deliberately split
nets, there's a need for something that looks like a cell (starts/ends
routing with pins on nets, has timing data) but isn't mapped to a fixed
bel in the architecture, but instead can have pin mappings defined at
runtime.
The PseudoCell allows this by providing an alternate, virtual-function
based API for such cells. When a cell has `pseudo_cell` used, instead of
calling functions such as getBelPinWire, getBelLocation or getCellDelay
in the Arch API; such data is provided by the cell itself, fully
flexible at runtime regardless of arch, via methods on the PseudoCell
implementation.
Diffstat (limited to 'generic')
| -rw-r--r-- | generic/arch.cc | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/arch.cc b/generic/arch.cc index 11b5868b..3df58c9b 100644 --- a/generic/arch.cc +++ b/generic/arch.cc @@ -605,7 +605,7 @@ bool Arch::place() bool have_iobuf_or_constr = false; for (auto &cell : cells) { CellInfo *ci = cell.second.get(); - if (ci->type == id("GENERIC_IOB") || ci->bel != BelId() || ci->attrs.count(id("BEL"))) { + if (ci->isPseudo() || ci->type == id("GENERIC_IOB") || ci->bel != BelId() || ci->attrs.count(id("BEL"))) { have_iobuf_or_constr = true; break; } |