1 files changed, 61 insertions, 0 deletions
diff --git a/fpga_interchange/lookahead.capnp b/fpga_interchange/lookahead.capnp
new file mode 100644
index 00000000..e69c165d
--- /dev/null
+++ b/fpga_interchange/lookahead.capnp
@@ -0,0 +1,61 @@
+@0x97c69817483d9dea;
+
+using Cxx = import "/capnp/c++.capnp";
+$Cxx.namespace("lookahead_storage");
+
+using DelayType = Int32;
+
+struct TypeWireId {
+    type  @0: Int32;
+    index @1: Int32;
+}
+
+struct TypeWirePair {
+    src @0 : TypeWireId;
+    dst @1 : TypeWireId;
+}
+
+struct InputSiteWireCost {
+    routeTo @0 : TypeWireId;
+    cost    @1 : DelayType;
+}
+
+struct InputSiteWireCostMap {
+    key   @0 : TypeWireId;
+    value @1 : List(InputSiteWireCost);
+}
+
+struct OutputSiteWireCostMap {
+    key               @0 : TypeWireId;
+    cheapestRouteFrom @1 : TypeWireId;
+    cost              @2 : DelayType;
+}
+
+struct SiteToSiteCostMap {
+    key  @0 : TypeWirePair;
+    cost @1 : DelayType;
+}
+
+struct CostMapEntry {
+    key     @0 : TypeWirePair;
+    data    @1 : List(DelayType);
+    xDim    @2 : UInt32;
+    yDim    @3 : UInt32;
+    xOffset @4 : UInt32;
+    yOffset @5 : UInt32;
+    penalty @6 : DelayType;
+}
+
+struct CostMap {
+    costMap @0 : List(CostMapEntry);
+}
+
+struct Lookahead {
+
+    chipdbHash      @0 : Text;
+    inputSiteWires  @1 : List(InputSiteWireCostMap);
+    outputSiteWires @2 : List(OutputSiteWireCostMap);
+    siteToSiteCost  @3 : List(SiteToSiteCostMap);
+    costMap         @4 : CostMap;
+}
+