diff --git a/spiOverJtag/Makefile b/spiOverJtag/Makefile
index f4201ca..7f86a61 100644
--- a/spiOverJtag/Makefile
+++ b/spiOverJtag/Makefile
@@ -5,7 +5,8 @@ XILINX_PARTS := xc3s500evq100 xc6slx16ftg256 xc6slx16csg324 xc6slx45csg324 xc6sl
 	xc7a100tcsg324 xc7a100tfgg484 xc7a100tfgg676\
 	xc7a200tsbg484 \
 	xc7s25csga324 xc7s50csga324 \
-	xc7k325tffg676 xc7k325tffg900
+	xc7k325tffg676 xc7k325tffg900 \
+	xc7k420tffg901
 XILINX_BIT_FILES := $(addsuffix .bit.gz,$(addprefix spiOverJtag_, $(XILINX_PARTS)))
 
 ALTERA_PARTS := 10cl025256 ep4ce2217 ep4ce1523 5ce223 5ce423 5ce523 5ce927
diff --git a/spiOverJtag/build.py b/spiOverJtag/build.py
index 86b495a..770229e 100755
--- a/spiOverJtag/build.py
+++ b/spiOverJtag/build.py
@@ -36,8 +36,14 @@ elif subpart == "xc7a":
     family = "Artix"
     tool = "vivado"
 elif subpart == "xc7k":
-    family = "Kintex 7"
-    tool = "vivado"
+    device_size = int(part.split('k')[1].split('t')[0])
+    if device_size <= 160:
+        family = "Kintex 7"
+        tool = "vivado"
+    else:
+        family = "Kintex7"
+        tool = "ise"
+    speed = -2
 elif subpart == "xc7s":
     family = "Spartan 7"
     tool = "vivado"
@@ -73,6 +79,7 @@ if tool in ["ise", "vivado"]:
         "xc7a200tfbg484"   : "xc7a_fbg484",
         "xc7k325tffg676"   : "xc7k_ffg676",
         "xc7k325tffg900"   : "xc7k_ffg900",
+        "xc7k420tffg901"   : "xc7k_ffg901",
         "xc7s25csga324"    : "xc7s_csga324",
         "xc7s50csga324"    : "xc7s_csga324"
         }[part]
@@ -80,19 +87,27 @@ if tool in ["ise", "vivado"]:
         cst_type = "UCF"
         tool_options = {'family': family,
                         'device': {
-                            "xc3s500evq100": "xc3s500e",
-                            "xc6slx16ftg256": "xc6slx16",
-                            "xc6slx16csg324": "xc6slx16",
-                            "xc6slx45csg324": "xc6slx45",
-                            "xc6slx100fgg484": "xc6slx100",
-                            "xc6slx150tfgg484": "xc6slx150t"}[part],
+                            "xc3s500evq100":    "xc3s500e",
+                            "xc6slx16ftg256":   "xc6slx16",
+                            "xc6slx16csg324":   "xc6slx16",
+                            "xc6slx45csg324":   "xc6slx45",
+                            "xc6slx100fgg484":  "xc6slx100",
+                            "xc6slx150tfgg484": "xc6slx150t",
+                            "xc7k325tffg676":   "xc7k325t",
+                            "xc7k325tffg900":   "xc7k325t",
+                            "xc7k420tffg901":   "xc7k420t",
+                            }[part],
                         'package': {
-                            "xc3s500evq100": "vq100",
-                            "xc6slx16ftg256": "ftg256",
-                            "xc6slx16csg324": "csg324",
-                            "xc6slx45csg324": "csg324",
-                            "xc6slx100fgg484": "fgg384",
-                            "xc6slx150tfgg484": "fgg484"}[part],
+                            "xc3s500evq100":    "vq100",
+                            "xc6slx16ftg256":   "ftg256",
+                            "xc6slx16csg324":   "csg324",
+                            "xc6slx45csg324":   "csg324",
+                            "xc6slx100fgg484":  "fgg384",
+                            "xc6slx150tfgg484": "fgg484",
+                            "xc7k325tffg676":   "ffg676",
+                            "xc7k325tffg900":   "ffg900",
+                            "xc7k420tffg901":   "ffg901",
+                            }[part],
                         'speed' : speed
                 }
     else:
diff --git a/spiOverJtag/constr_xc7k_ffg676.ucf b/spiOverJtag/constr_xc7k_ffg676.ucf
new file mode 100644
index 0000000..09592cc
--- /dev/null
+++ b/spiOverJtag/constr_xc7k_ffg676.ucf
@@ -0,0 +1,6 @@
+NET "csn"       LOC = C23 | IOSTANDARD = LVCMOS33;
+NET "sdi_dq0"   LOC = B24 | IOSTANDARD = LVCMOS33;
+NET "sdo_dq1"   LOC = A25 | IOSTANDARD = LVCMOS33;
+NET "wpn_dq2"   LOC = B22 | IOSTANDARD = LVCMOS33;
+NET "hldn_dq3"  LOC = A22 | IOSTANDARD = LVCMOS33;
+
diff --git a/spiOverJtag/constr_xc7k_ffg900.ucf b/spiOverJtag/constr_xc7k_ffg900.ucf
new file mode 100644
index 0000000..a89e557
--- /dev/null
+++ b/spiOverJtag/constr_xc7k_ffg900.ucf
@@ -0,0 +1,6 @@
+NET "csn"       LOC = U19 | IOSTANDARD = LVCMOS33;
+NET "sdi_dq0"   LOC = P24 | IOSTANDARD = LVCMOS33;
+NET "sdo_dq1"   LOC = R25 | IOSTANDARD = LVCMOS33;
+NET "wpn_dq2"   LOC = R20 | IOSTANDARD = LVCMOS33;
+NET "hldn_dq3"  LOC = R21 | IOSTANDARD = LVCMOS33;
+
diff --git a/spiOverJtag/constr_xc7k_ffg901.ucf b/spiOverJtag/constr_xc7k_ffg901.ucf
new file mode 100644
index 0000000..de2dfbe
--- /dev/null
+++ b/spiOverJtag/constr_xc7k_ffg901.ucf
@@ -0,0 +1,6 @@
+NET "csn"       LOC = V26 | IOSTANDARD = LVCMOS33;
+NET "sdi_dq0"   LOC = R30 | IOSTANDARD = LVCMOS33;
+NET "sdo_dq1"   LOC = T30 | IOSTANDARD = LVCMOS33;
+NET "wpn_dq2"   LOC = R28 | IOSTANDARD = LVCMOS33;
+NET "hldn_dq3"  LOC = T28 | IOSTANDARD = LVCMOS33;
+
diff --git a/spiOverJtag/spiOverJtag_xc7k420tffg901.bit.gz b/spiOverJtag/spiOverJtag_xc7k420tffg901.bit.gz
new file mode 100644
index 0000000..f8833b0
Binary files /dev/null and b/spiOverJtag/spiOverJtag_xc7k420tffg901.bit.gz differ