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diff --git a/shakti/m_class/I2S.mdwn b/shakti/m_class/I2S.mdwn
index 36a68f3e6657126534a016adf6353cf56e8ec2c3..3702458f8ef7673b2c85c158217893b77b34c4e6 100644 (file)
--- a/shakti/m_class/I2S.mdwn
+++ b/shakti/m_class/I2S.mdwn
@@ -3,3 +3,10 @@
 * <http://bugs.libre-riscv.org/show_bug.cgi?id=3>
 * <https://github.com/skristiansson/i2s>
 
+Question: how does I2S do 4-wire output?
+
+# AC97
+
+* <https://opencores.org/project,ac97>
+
+Question: how does AC97 fit in with I2S?