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diff --git a/src/edu/berkeley/slipway/util/ExperimentUtils.java b/src/edu/berkeley/slipway/util/ExperimentUtils.java
new file mode 100644
index 0000000..15a86f5
--- /dev/null
+++ b/src/edu/berkeley/slipway/util/ExperimentUtils.java
@@ -0,0 +1,83 @@
+package edu.berkeley.slipway.util;
+
+import java.io.*;
+import java.util.*;
+import java.awt.*;
+import com.atmel.fpslic.*;
+import edu.berkeley.slipway.*;
+import edu.berkeley.slipway.gui.*;
+import static com.atmel.fpslic.FpslicConstants.*;
+
+/** useful test structures */
+public class ExperimentUtils {
+
+    /** 
+     *  Creates a 2x2 cell frequency divider with top left corner at
+     *  c, taking input from c.north() and providing output on the
+     *  orthogonal axis at c.south().  Returns c.south().south() for
+     *  easy daisy-chaining.
+     */
+    public static FpslicDevice.Cell divider(FpslicDevice.Cell c) {
+        FpslicDevice.Cell detect1 = c;
+        FpslicDevice.Cell detect2 = c.east();
+
+        detect1.yi(NORTH);
+        detect1.ylut(LUT_SELF);
+        detect1.xlut(LUT_OTHER & (~LUT_Z));
+        detect1.c(YLUT);
+        detect1.t(TMUX_FB);
+        detect1.f(false);
+        detect1.b(false);
+
+        detect2.xi(NW);
+        detect2.ylut(LUT_OTHER);
+        detect2.xlut((~LUT_SELF) & LUT_Z);
+        detect2.c(YLUT);
+        detect2.t(TMUX_FB);
+        detect2.f(false);
+        detect2.b(false);
+
+        detect1.south().yi(EAST);
+        detect1.south().xi(NE);
+        detect1.south().c(YLUT);
+        detect1.south().t(TMUX_FB);
+        detect1.south().f(false);
+        detect1.south().b(false);
+        detect1.south().ylut( (LUT_OTHER    & (~LUT_SELF)) |
+                              ((~LUT_OTHER) &   LUT_Z)
+                              );
+        detect1.south().xlut( (LUT_SELF    & (~LUT_OTHER)) |
+                              ((~LUT_SELF) &   LUT_Z)
+                              );
+
+        detect2.south().yi(WEST);
+        detect2.south().xi(NW);
+        detect2.south().c(YLUT);
+        detect2.south().t(TMUX_FB);
+        detect2.south().f(false);
+        detect2.south().b(false);
+        detect2.south().ylut( (LUT_OTHER    & (LUT_SELF)) |
+                              ((~LUT_OTHER) &   LUT_Z)
+                              );
+        detect2.south().xlut( (LUT_SELF    & (~LUT_OTHER)) |
+                              ((~LUT_SELF) &   LUT_Z)
+                              );
+
+        if (c.south().south()==null) return null;
+        if (c.south().south().south()==null) return null;
+        return c.south().south();
+    }
+
+    /** set up the scan cell */
+    public static void setupScanCell(FpslicDevice fpslic) {
+        fpslic.cell(23,15).h(3, true);
+        fpslic.cell(23,15).yi(L3);
+        fpslic.cell(23,15).ylut(0xAA);
+        fpslic.iob_right(15, true).enableOutput(WEST);
+
+        fpslic.cell(23,0).ylut(0x00);
+        fpslic.iob_right(0, true).enableOutput(WEST);
+        fpslic.flush();
+    }
+
+}
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