Its working! Demo commit

We have something at least, audio is working and sounding dang good

design/sd/rom_sd.sv

@@ -21,7 +21,7 @@ typedef enum logic [3:0]{
 state_t current, next;
 // First we write 2048B into the memory buffer, then signal to play it and
 // wait for half signal to avoid overwriting memory
-logic [16:0] rom_addr;
+logic [18:0] rom_addr;
 logic [7:0] rom_data;
 logic rom_enable;
 logic buffer_half;
@@ -33,7 +33,7 @@ logic buffer_half;
 // The ROM has 17 address bits and 8 data bits to store 128KiB, more than
 // enough for one second of 48khz audio
 xpm_memory_sprom #(
-  .ADDR_WIDTH_A(17),               // DECIMAL
+  .ADDR_WIDTH_A(19),               // DECIMAL
   .AUTO_SLEEP_TIME(0),             // DECIMAL
   .CASCADE_HEIGHT(0),              // DECIMAL
   .ECC_BIT_RANGE("7:0"),           // String
@@ -44,7 +44,7 @@ xpm_memory_sprom #(
   .MEMORY_INIT_PARAM(""),         // String
   .MEMORY_OPTIMIZATION("true"),    // String
   .MEMORY_PRIMITIVE("auto"),       // String
-  .MEMORY_SIZE(131072*8),          // DECIMAL
+  .MEMORY_SIZE((1<<19)*8),          // DECIMAL
   .MESSAGE_CONTROL(0),             // DECIMAL
   .RAM_DECOMP("auto"),             // String
   .READ_DATA_WIDTH_A(8),           // DECIMAL