diff --git a/LICENSE b/LICENSE
index 261eeb9..a45ecfb 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,201 +1,20 @@
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+Copyright (c) 2022 Tamas Hubai
 
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diff --git a/README.md b/README.md
index 34b9a05..99b4f61 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,32 @@
-# Caravel User Project
+# Universal gates, self-documenting version
 
-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![UPRJ_CI](https://github.com/efabless/caravel_project_example/actions/workflows/user_project_ci.yml/badge.svg)](https://github.com/efabless/caravel_project_example/actions/workflows/user_project_ci.yml) [![Caravel Build](https://github.com/efabless/caravel_project_example/actions/workflows/caravel_build.yml/badge.svg)](https://github.com/efabless/caravel_project_example/actions/workflows/caravel_build.yml)
+This project is an enhanced version of [unigate-gf](https://github.com/htfab/unigate-gf).
 
-| :exclamation: Important Note            |
-|-----------------------------------------|
+In <i>normal</i> mode, it contains four independent universal logic gates:
 
-## Please fill in your project documentation in this README.md file 
+- <i>U</i><sub>21</sub> on input pins 5-8 and output pin 32
+- <i>U</i><sub>31</sub> on input pins 9-14 and output pin 33
+- <i>U</i><sub>41</sub> on input pins 15-24 and output pin 34
+- <i>U</i><sub>22</sub> on input pins 25-30 and output pins 35-36
 
-Refer to [README](docs/source/index.rst#section-quickstart) for a quickstart of how to use caravel_user_project
+where <i>U<sub>ij</sub></i> can be suitably wired to power, ground and inputs such that
+it implements any particular Boolean function on <i>i</i> inputs and <i>j</i> outputs.
 
-Refer to [README](docs/source/index.rst) for this sample project documentation. 
+There is an additional mux that selects one of the outputs of the above <i>U</i><sub>22</sub>
+based on input pin 31 and outputs it on pin 37. This allows us to transform <i>U</i><sub>22</sub>
+into another instance of <i>U</i><sub>31</sub>.
+
+In <i>reference</i> mode, it uses a lookup table to tell us how to wire the universal gates to
+achieve a specific Boolean function.
+
+- setting input pins 5-6 and 31 and clearing input pins 7-8 activates reference mode
+  (this particular combination is never needed in normal mode)
+- use input pins 9-10 to select one of <i>U</i><sub>21</sub>,
+  <i>U</i><sub>31</sub>, <i>U</i><sub>41</sub>, <i>U</i><sub>22</sub>
+- use input pins 11-26 to specify the truth table of the Boolean function
+- use input pins 27-30 to specify the input pin number to be wired
+- signal on output pin 32 means the selected pin should be wired to ground
+- signal on output pin 33 means the selected pin should be wired to power
+- signal on output pins 34-37 mean the selected pin should be wired to
+  the inputs 1-4 of the Boolean function respectively
+
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+++ b/docs/nand-s.jpg
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new file mode 100644
index 0000000..94ed09b
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diff --git a/verilog/rtl/mux.v b/verilog/rtl/mux.v
index 8dcd3a3..af2b50e 100644
--- a/verilog/rtl/mux.v
+++ b/verilog/rtl/mux.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module mux1 (
     input [1:0] in,
     input sel,
diff --git a/verilog/rtl/u21.v b/verilog/rtl/u21.v
index 42b25f3..2bd2d62 100644
--- a/verilog/rtl/u21.v
+++ b/verilog/rtl/u21.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u21 (
     input [3:0] in,
     output out
diff --git a/verilog/rtl/u21_ref.v b/verilog/rtl/u21_ref.v
index 6dbf0a4..0b07f5d 100644
--- a/verilog/rtl/u21_ref.v
+++ b/verilog/rtl/u21_ref.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u21_ref (
     input [3:0] func,
     input [1:0] pin,
diff --git a/verilog/rtl/u21_ref_tb.v b/verilog/rtl/u21_ref_tb.v
index ab958a3..57380cd 100644
--- a/verilog/rtl/u21_ref_tb.v
+++ b/verilog/rtl/u21_ref_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u21_ref_tb ();
 
 integer i;
diff --git a/verilog/rtl/u21_tb.v b/verilog/rtl/u21_tb.v
index 70b8542..4809dba 100644
--- a/verilog/rtl/u21_tb.v
+++ b/verilog/rtl/u21_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u21_tb ();
 
 integer i;
diff --git a/verilog/rtl/u22.v b/verilog/rtl/u22.v
index 6c0dfa8..86fcacf 100644
--- a/verilog/rtl/u22.v
+++ b/verilog/rtl/u22.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u22 (
     input [5:0] in,
     output [1:0] out
diff --git a/verilog/rtl/u22_ref.v b/verilog/rtl/u22_ref.v
index ffba66e..43d1bf1 100644
--- a/verilog/rtl/u22_ref.v
+++ b/verilog/rtl/u22_ref.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u22_ref (
     input [3:0] func1,
     input [3:0] func2,
diff --git a/verilog/rtl/u22_ref_tb.v b/verilog/rtl/u22_ref_tb.v
index cd164b8..0899d12 100644
--- a/verilog/rtl/u22_ref_tb.v
+++ b/verilog/rtl/u22_ref_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u22_ref_tb ();
 
 integer i;
diff --git a/verilog/rtl/u22_tb.v b/verilog/rtl/u22_tb.v
index 94d39e8..c452d61 100644
--- a/verilog/rtl/u22_tb.v
+++ b/verilog/rtl/u22_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u22_tb ();
 
 integer i;
diff --git a/verilog/rtl/u31.v b/verilog/rtl/u31.v
index 50ba800..532a192 100644
--- a/verilog/rtl/u31.v
+++ b/verilog/rtl/u31.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u31 (
     input [5:0] in,
     output out
diff --git a/verilog/rtl/u31_ref.v b/verilog/rtl/u31_ref.v
index f55a469..bc9590b 100644
--- a/verilog/rtl/u31_ref.v
+++ b/verilog/rtl/u31_ref.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u31_ref (
     input [7:0] func,
     input [2:0] pin,
diff --git a/verilog/rtl/u31_ref_tb.v b/verilog/rtl/u31_ref_tb.v
index 4586d7c..67f3149 100644
--- a/verilog/rtl/u31_ref_tb.v
+++ b/verilog/rtl/u31_ref_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u31_ref_tb ();
 
 integer i;
diff --git a/verilog/rtl/u31_tb.v b/verilog/rtl/u31_tb.v
index 89fbaaa..6d73e78 100644
--- a/verilog/rtl/u31_tb.v
+++ b/verilog/rtl/u31_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u31_tb ();
 
 integer i;
diff --git a/verilog/rtl/u41.v b/verilog/rtl/u41.v
index 1959ba0..1b45163 100644
--- a/verilog/rtl/u41.v
+++ b/verilog/rtl/u41.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41 (
     input [9:0] in,
     output out
diff --git a/verilog/rtl/u41_fullref.v b/verilog/rtl/u41_fullref.v
index 0623749..53cc183 100644
--- a/verilog/rtl/u41_fullref.v
+++ b/verilog/rtl/u41_fullref.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41_fullref (
     input [15:0] func,
     input [3:0] pin,
diff --git a/verilog/rtl/u41_fullref_tb.v b/verilog/rtl/u41_fullref_tb.v
index 60eeb4d..4968fd6 100644
--- a/verilog/rtl/u41_fullref_tb.v
+++ b/verilog/rtl/u41_fullref_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41_fullref_tb ();
 
 integer i;
diff --git a/verilog/rtl/u41_norm.v b/verilog/rtl/u41_norm.v
index 48d3394..4e505b1 100644
--- a/verilog/rtl/u41_norm.v
+++ b/verilog/rtl/u41_norm.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41_norm (
     input [15:0] func,
     output [15:0] norm,
diff --git a/verilog/rtl/u41_ref.v b/verilog/rtl/u41_ref.v
index 31ab5b3..a71363e 100644
--- a/verilog/rtl/u41_ref.v
+++ b/verilog/rtl/u41_ref.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41_ref (
     input [15:0] func,
     input [3:0] pin,
diff --git a/verilog/rtl/u41_ref_tb.v b/verilog/rtl/u41_ref_tb.v
index d6c38d3..37d4af7 100644
--- a/verilog/rtl/u41_ref_tb.v
+++ b/verilog/rtl/u41_ref_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41_ref_tb ();
 
 integer i;
diff --git a/verilog/rtl/u41_rest.v b/verilog/rtl/u41_rest.v
index a5fc6d4..f9404cb 100644
--- a/verilog/rtl/u41_rest.v
+++ b/verilog/rtl/u41_rest.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41_rest (
     input [7:0] perm,
     input [2:0] coord,
diff --git a/verilog/rtl/u41_tb.v b/verilog/rtl/u41_tb.v
index 654bba0..b261ce1 100644
--- a/verilog/rtl/u41_tb.v
+++ b/verilog/rtl/u41_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module u41_tb ();
 
 integer i;
diff --git a/verilog/rtl/ucomb.v b/verilog/rtl/ucomb.v
index fc92eba..e937f7d 100644
--- a/verilog/rtl/ucomb.v
+++ b/verilog/rtl/ucomb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module ucomb (
     input [3:0] u21_in,
     input [5:0] u31_in,
diff --git a/verilog/rtl/ucomb_full.v b/verilog/rtl/ucomb_full.v
index 778706b..0178fc3 100644
--- a/verilog/rtl/ucomb_full.v
+++ b/verilog/rtl/ucomb_full.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module ucomb_full (
     input [26:0] in,
     output [5:0] out
diff --git a/verilog/rtl/ucomb_full_tb.v b/verilog/rtl/ucomb_full_tb.v
index 7c26c58..5e2d997 100644
--- a/verilog/rtl/ucomb_full_tb.v
+++ b/verilog/rtl/ucomb_full_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module ucomb_full_tb ();
 
 integer i;
diff --git a/verilog/rtl/ucomb_ref.v b/verilog/rtl/ucomb_ref.v
index 00740b8..c4a51b0 100644
--- a/verilog/rtl/ucomb_ref.v
+++ b/verilog/rtl/ucomb_ref.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module ucomb_ref (
     input [1:0] sel,
     input [15:0] func,
diff --git a/verilog/rtl/unigate_tb.v b/verilog/rtl/unigate_tb.v
index 4e442ac..aecf7f7 100644
--- a/verilog/rtl/unigate_tb.v
+++ b/verilog/rtl/unigate_tb.v
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 Tamas Hubai
+
+`default_nettype none
+
 module unigate_tb ();
 
 reg clk;