add link

diff --git a/3d_gpu.mdwn b/3d_gpu.mdwn
index 7b5c458e472e6b9a0c0312ccfd6612e639434123..e7fece07e3654a1d0e6a8a4c7a2131d769e44278 100644 (file)
--- a/3d_gpu.mdwn
+++ b/3d_gpu.mdwn
@@ -51,3 +51,4 @@ Progress:
 * <https://jeffrey.co.in/blog/2014/01/d-flip-flop-using-migen/>
 * <http://lists.libre-riscv.org/pipermail/libre-riscv-dev/2019-March/000705.html>
 * <https://chisel.eecs.berkeley.edu/api/latest/chisel3/util/DecoupledIO.html>
+* <http://www.clifford.at/papers/2016/yosys-synth-formal/slides.pdf>