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diff --git a/3d_gpu/tutorial.mdwn b/3d_gpu/tutorial.mdwn
index 5a263de34d44364f5a3dd289bfc6770e1aa61125..7e28146746494e957ee78d8a94ab0e6f74d2a0be 100644 (file)
--- a/3d_gpu/tutorial.mdwn
+++ b/3d_gpu/tutorial.mdwn
@@ -71,6 +71,13 @@ Occasionally, then, the licensee of those Cells will allow you to use
 The official Industry term for these is "phantom views".  See
 <http://bugs.libre-riscv.org/show_bug.cgi?id=178#c106> for discussion.
 
+Then there are also "abstract" views: these are also under NDA.
+So, we will be doing the layout in generic "lambda" design,
+and a conversion pass (under NDA) is carried out which maps to
+TSMC. See
+<http://lists.libre-riscv.org/pipermail/libre-riscv-dev/2020-March/004804.html>
+
+
 # nmigen
 
 Once you understand gates and python, nmigen starts to make sense.