add i2s files

i2s_transceiver.v

@@ -0,0 +1,27 @@
+// This I2S Playback design uses the common 44.1 kHz 
+// sampling frequency.  
+// From Figure 2 in Section 4.1.1 of the CS5343 
+// Datasheet, it is appropriate to use an SCLK/LRCK 
+// ratio of 64 and a MCLK/LRCK ratio of 256.  
+// Therefore, the I2S Transceiver’s generic 
+// parameter sclk_ws_ratio is set to 64.  
+// (LRCK, e.g. left-right clock, and ws, 
+// e.g. word select, are synonymous.)  
+// The generic parameter mclk_sclk_ratio is set to 4, 
+// since MCLK/SCLK = (MCLK/LRCK) / (SCLK/LRCK) = 256/64 = 4.
+
+
+
+module i2c_transceiver #( parameter
+    sclk_ws_ratio = 64,
+    mclk_sclk_ratio = 4
+)(
+    output          sclk,
+    input           mclk,
+    output          ws,
+    input           sd_rx,
+    output          sd_tx    );
+
+
+
+endmodule