Merge pull request #591 from litghost/add_constant_network

Add constant network support to FPGA interchange arch

1 files changed, 45 insertions, 0 deletions

diff --git a/fpga_interchange/site_router.h b/fpga_interchange/site_router.h
new file mode 100644
index 00000000..561dae9d
--- /dev/null
+++ b/fpga_interchange/site_router.h
@@ -0,0 +1,45 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2021  Symbiflow Authors
+ *
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef NEXTPNR_H
+#error Include "site_router.h" via "nextpnr.h" only.
+#endif
+
+NEXTPNR_NAMESPACE_BEGIN
+
+struct Context;
+struct TileStatus;
+
+struct SiteRouter
+{
+    SiteRouter(int16_t site) : site(site), dirty(false), site_ok(true) {}
+
+    std::unordered_set<CellInfo *> cells_in_site;
+    const int16_t site;
+
+    mutable bool dirty;
+    mutable bool site_ok;
+
+    void bindBel(CellInfo *cell);
+    void unbindBel(CellInfo *cell);
+    bool checkSiteRouting(const Context *ctx, const TileStatus &tile_status) const;
+};
+
+NEXTPNR_NAMESPACE_END