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diff --git a/shakti/m_class/ULPI.mdwn b/shakti/m_class/ULPI.mdwn
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--- a/shakti/m_class/ULPI.mdwn
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@@ -8,6 +8,18 @@
 ## LICENSE
 BSD I guess...(fix me)
 
+## Useful resources
+
+![UTMI_interface](https://www.crifan.com/files/pic/serial_story/other_site/p_blog_bb.JPG)
+
+![UTMI+levels](https://www.crifan.com/files/pic/serial_story/other_site/p_blog_aa.JPG)
+
+![UTMI+level3_interface](https://www.crifan.com/files/pic/serial_story/other_site/p_blog_cc.JPG)
+
+![LPI_signals](https://www.crifan.com/files/pic/serial_story/other_site/p_blog_dd.JPG)
+
+![LPI_signals_table](https://www.crifan.com/files/pic/serial_story/other_site/p_blog_dd.JPG)
+
 ## reference
 * <https://opencores.org/project,ulpi_wrapper> (GPL'd)
 * <https://github.com/mossmann/daisho/blob/master/sw/fpga/common/usb3/usb2_ulpi.v> (BSD)