[RouterHelper] invertPossibleGndPinsToVccPins() fallback through IMRs

Signed-off-by: Eddie Hung <[email protected]>
Xilinx · Jan 2, 2025 · 79d2b88 · 79d2b88
1 parent 2a96896
commit 79d2b88
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Showing 2 changed files with 8 additions and 2 deletions.
diff --git a/src/com/xilinx/rapidwright/design/DesignTools.java b/src/com/xilinx/rapidwright/design/DesignTools.java
@@ -2044,7 +2044,7 @@ private static void foreachConnectedBELPin(BELPin pin, SiteInst si, Consumer<BEL
     }
 
     /**
-     * Looks in the site instance for cells connected to this BEL pin and SiteInst.
+     * Looks in the site instance for cells connected (i.e. with a logical pin mapping) to this BEL pin and SiteInst.
      * Will walk through used SitePIPs and routethru cells (e.g. LUTs, IMR registers, etc.)
      * @param pin The BELPin to examine for connected cells.
      * @param si The SiteInst to examine for connected cells.
@@ -2062,7 +2062,7 @@ public static Set<Cell> getConnectedCells(BELPin pin, SiteInst si) {
     }
 
     /**
-     * Looks in the site instance for cells connected to this site pin.
+     * Looks in the site instance for cells connected (i.e. with a logical pin mapping) to this site pin.
      * Will walk through used SitePIPs and routethru cells (e.g. LUTs, IMR registers, etc.)
      * @param pin The SitePinInst to examine for connected cells.
      * @return Set of connected cells to this pin.

diff --git a/src/com/xilinx/rapidwright/rwroute/RouterHelper.java b/src/com/xilinx/rapidwright/rwroute/RouterHelper.java
@@ -367,6 +367,12 @@ public static Set<SitePinInst> invertPossibleGndPinsToVccPins(Design design,
                             continue;
                         }
                         BEL bel = belPin.getBEL();
+                        if (isVersal && bel.isIMR()) {
+                            // Since DesignTools.getConnectedCells() will only return cells
+                            // for which a logical pin mapping exists, for the purpose of
+                            // identifying SRL16s walk through this IMR
+                            bel = si.getBEL(bel.getName().substring(0,1) + "6LUT");
+                        }
                         Cell cell = si.getCell(bel);
                         if (cell == null) {
                             continue;