Added a few more demos and one last attempt

at audio fixup. It did nothing of course lol

Reverted back to 16-bit pcm because it sounds marginally better than
8-bit

design/nexys_a7_top.sv

@@ -130,6 +130,7 @@ playback_controller playbackController (clk_10hz,reset,BTNC, BTNR, speed);
         clk_100khz,
         clk_25mhz,
         CLK100MHZ,
+        clk_1mhz,
         reset,
         SD_DAT,
         SD_CMD,
@@ -138,7 +139,7 @@ playback_controller playbackController (clk_10hz,reset,BTNC, BTNR, speed);
         audio_interface.driver
     );
 
-    audio_buffer #(.SIZE(8)) audioBuffer(
+    audio_buffer #(.SIZE(16)) audioBuffer(
         clk_48khz, 
         reset, 
         sd_ready, 
@@ -148,7 +149,7 @@ playback_controller playbackController (clk_10hz,reset,BTNC, BTNR, speed);
         audio_sample, 
         audio_interface.receiver
     );
-    pwm #(8) audioOutput(CLK100MHZ, reset, clk_48khz, audio_sample, AUD_PWM);
+    pwm #(11) audioOutput(CLK100MHZ, reset, clk_48khz, audio_sample, AUD_PWM);
 
 `endif
 

design/sd/read_data.sv

@@ -9,6 +9,7 @@
  ***/
 module read_data(
     input clk,
+    input mem_clk,
     input reset,
     input [3:0] sd_data,
     audio_buffer_interface.driver buffer

design/sd/sd_controller.sv

@@ -12,6 +12,7 @@ module sd_controller(
 (* MARK_DEBUG = "TRUE" *)
     input logic fast_clk,
     input logic crc_clk,
+    input logic mem_clk,
     input logic reset,
 (* MARK_DEBUG = "TRUE" *)
     input logic [3:0] sd_data,
@@ -104,6 +105,7 @@ read_command slowReader(
 // The data line is only ever used at fast_clk speeds
 read_data dataHandler(
     fast_clk,
+    mem_clk,
     reset,
     sd_data,
     buffer