diff --git a/examples/cordic/cordic_impl.py b/examples/cordic/cordic_impl.py
new file mode 100644
index 000000000..d7ac084fa
--- /dev/null
+++ b/examples/cordic/cordic_impl.py
@@ -0,0 +1,61 @@
+import copy
+import json
+
+from migen.fhdl.std import *
+from migen.genlib.cordic import Cordic
+from mibuild.generic_platform import *
+from mibuild.xilinx_ise import XilinxISEPlatform, CRG_SE
+
+
+class CordicImpl(Module):
+	def __init__(self, name, **kwargs):
+		self.name = name
+		json.dump(kwargs, open("build/{}.json".format(name), "w"))
+		self.platform = platform = Platform()
+		self.submodules.cordic = Cordic(**kwargs)
+		width = flen(self.cordic.xi)
+		self.comb += self.cordic.xi.eq(
+				int((1<<width - 1)/self.cordic.gain*.98))
+		self.comb += self.cordic.yi.eq(0)
+		zi = self.cordic.zi
+		self.sync += zi.eq(zi + 1)
+		do = platform.request("do")
+		self.sync += do.eq(Cat(self.cordic.xo, self.cordic.yo))
+
+	def build(self):
+		self.platform.build(self, build_name=self.name)
+
+class Platform(XilinxISEPlatform):
+	_io = [
+		("clk", 0, Pins("AB13")),
+		("rst", 0, Pins("V5")),
+		("do", 0,
+			Pins("Y2 W3 W1 P8 P7 P6 P5 T4 T3",
+				"U4 V3 N6 N7 M7 M8 R4 P4 M6 L6 P3 N4",
+				"M5 V2 V1 U3 U1 T2 T1 R3 R1 P2 P1"),
+		),
+	]
+	def __init__(self):
+		XilinxISEPlatform.__init__(self, "xc6slx45-fgg484-2", self._io,
+			lambda p: CRG_SE(p, "clk", "rst", 10.))
+
+if __name__ == "__main__":
+	default = dict(width=16, guard=0, eval_mode="pipelined",
+			func_mode="circular", cordic_mode="rotate")
+	variations = dict(
+			eval_mode=["combinatorial", "pipelined", "iterative"],
+			width=[4, 8, 12, 14, 16, 20, 24, 32],
+			stages=[10, 12, 14, 16, 20, 24, 32],
+			guard=[0, 1, 2, 3, 4],
+			)
+	CordicImpl("cordic_test", eval_mode="combinatorial").build()
+
+	name = "cordic_baseline"
+	CordicImpl(name, **default).build()
+
+	for k, v in sorted(variations.items()):
+		for vi in v:
+			name = "cordic_{}_{}".format(k, vi)
+			kw = copy.copy(default)
+			kw[k] = vi
+			CordicImpl(name, **kw).build()
diff --git a/examples/cordic/cordic_impl_eval.py b/examples/cordic/cordic_impl_eval.py
new file mode 100644
index 000000000..eeefffb81
--- /dev/null
+++ b/examples/cordic/cordic_impl_eval.py
@@ -0,0 +1,71 @@
+import glob, os, re, json
+
+import numpy as np
+import matplotlib.pyplot as plt
+import pandas
+
+
+def extract(b, n, r, c=int):
+	r = re.compile(r)
+	try:
+		f = open(b + n)
+	except:
+		return
+	for l in f:
+		m = r.search(l)
+		if m:
+			v = m.groups()[0]
+			v = v.replace(",", "")
+			return c(v)
+
+def load(prefix, base):
+	kw = json.load(open(base))
+	b = os.path.splitext(base)[0]
+	_, n = os.path.split(b)[1].split("_", 1)
+	try:
+		n, _ = n.rsplit("_", 1)
+		kw["vary"] = n
+	except:
+		pass
+	kw["slack"] = extract(b, ".par",
+			"GRPclk.*SETUP +\\| +([\d,]+\\.\d+)", float)
+	kw["freq"] = extract(b, ".srp",
+			"Maximum Frequency: +([\d,]+\\.\d+) *MHz", float)
+	kw["reg"] = extract(b, "_map.mrp",
+			"Number of Slice Registers: +([\d,]+) ")
+	kw["lut"] = extract(b, "_map.mrp",
+			"Number of Slice LUTs: +([\d,]+) ")
+	kw["slice"] = extract(b, "_map.mrp",
+			"Number of occupied Slices: +([\d,]+) ")
+	return kw
+
+def run(prefix):
+	dat = {}
+	for base in glob.glob("build/{}_*.json".format(prefix)):
+		kw = load(prefix, base)
+		if "vary" in kw:
+			dat[base] = kw
+	df = pandas.DataFrame.from_dict(dat, orient="index")
+	comp = "freq slice slack".split()
+	dfg = df.groupby("vary")
+	fig, ax = plt.subplots(len(dfg), len(comp))
+	for axj, (v, dfi) in zip(ax, dfg):
+		print(v, dfi)
+		if v not in dfi:
+			continue
+		dfi = dfi.sort(v)
+		for axi, n in zip(axj, comp):
+			x = dfi[v]
+			if type(x[0]) is type(""):
+				xi = range(len(x))
+				axi.set_xticks(xi)
+				axi.set_xticklabels(x)
+				x = xi
+			axi.plot(x, dfi[n])
+			axi.set_xlabel(v)
+			axi.set_ylabel(n)
+	fig.savefig("cordic_impl.pdf")
+	plt.show()
+
+if __name__ == "__main__":
+	run("cordic")