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diff --git a/docs/pinmux.mdwn b/docs/pinmux.mdwn
index 2c6f9782c4b777f1d8fc50cfcc2cf8f1dc00143f..7977fe088bfae3dd25302e8953087f4e0d89562b 100644 (file)
--- a/docs/pinmux.mdwn
+++ b/docs/pinmux.mdwn
@@ -3,6 +3,7 @@
 Links:
 
 * <http://www2.eng.cam.ac.uk/~dmh/4b7/resource/section14.htm>
+* <https://www10.edacafe.com/book/ASIC/CH02/CH02.7.php>
 * <https://ftp.libre-soc.org/Pin_Control_Subsystem_Overview.pdf>
 * <https://bugs.libre-soc.org/show_bug.cgi?id=50>
 * <https://git.libre-soc.org/?p=c4m-jtag.git;a=tree;hb=HEAD>