getting stuck, commiting for the night

Nexys4Game/src/hdl/CL_block.v

@@ -12,6 +12,7 @@ module CL_block(
     output SD_SCK,
     output SD_CMD,
     output [37*16-1:0] metadata_link,
+    output [36:0] metadata_available,
     output reset, //status signal for reset
     output pause, //status signal for game-pause
     output song_time //current song_time
@@ -153,9 +154,12 @@ module CL_block(
         .clk25(clk25),
         .write_en(write_data),
         .write_word(data_word),
+        .metadata_request(metadata_request),
 
         //TODO
 
+        .metadata_available(),
+        .metadata_link(metadata_link),
         .loaded(data_loaded)
     );
 

Nexys4Game/src/hdl/CL_metadata_controller.v

@@ -3,7 +3,10 @@ module CL_metadata_controller(
     input clk25, //25mhz clk
     input write_en, //signals a new word to be written
     input [31:0] write_word, //word to be written    
+    input [36:0] metadata_request,
 
+    output reg [36:0] metadata_available,
+    output reg [37*16-1:0] metadata_link,
     output reg loaded
 
     );
@@ -12,6 +15,7 @@ module CL_metadata_controller(
     reg [11:0] new_pointer = 0; //1 clk delay on updating pointer
 
     initial loaded = 0;
+    initial metadata_link = 0;
 
     reg we;
     reg [31:0] din;
@@ -35,6 +39,10 @@ module CL_metadata_controller(
             we <= 0;
         end
         pointer <= new_pointer;
+
+        if(metadata_request != 0) begin
+        end
+
     end
 
 

Nexys4Game/src/hdl/SC_block.v

@@ -4,6 +4,7 @@ module SC_block(
     input [15:0] song_time, //current song time
     input [36:0] NDATA, //deserialized note data
     input [37*16-1:0] metadata_link, //input from the metadata table
+    input [36:0] metadata_available,
 
     output [36:0] metadata_request, //request line to metadata table
     output [31:0] score, //score output to the AV block ARBITRARY WIDTH
@@ -25,6 +26,7 @@ module SC_block(
         .NDATA(NDATA),
         .metadata_link(metadata_link),
         .metadata_request(metadata_request),
+        .metadata_available(metadata_available),
         .match_trigger(match_trigger),
         .match_time(match_time)
     );

Nexys4Game/src/hdl/SC_note_matching_sub.v

@@ -3,6 +3,7 @@ module SC_note_matching_sub(
     input [15:0] song_time, //current song time
     input note_edge, //if note has become active (must be a single-cycle pulse)
     input [15:0] note_time, //time of next note, or all 1's if no note in buffer
+    input note_available, //high when note requested is available
     output reg note_request, //a pulse if a new note is needed to be shifted in    
     output reg match_enable, //a pulse signaling a new note-match
     output reg [15:0] match_time //time which the note has been matched to.
@@ -20,15 +21,16 @@ module SC_note_matching_sub(
 
         if(future_note < song_time && ~note_request) begin //if future note not in the future
             past_note <= future_note; //shift in the new past_note
+            future_note <= 0; //invalid, will fail to match with extremely high probability due to overflow
             note_request <= 1; //request new note
         end
-        else note_request <= 0;
 
-        if(note_request) begin
+        if(note_request && note_available) begin
+            note_request <= 0; //stop requesting
             future_note <= note_time; //shift in new future note
         end
 
-        if(song_time - past_note > NOTE_TIMEOUT) begin //if nearest note is timed-out MAY CONTAIN SIGN PROBLEMS
+        if(song_time > NOTE_TIMEOUT + past_note) begin //if nearest note is timed-out
             past_note <= 0; //write invalid
         end
 

Nexys4Game/src/hdl/SC_note_matching_super.v

@@ -3,6 +3,7 @@ module SC_note_matching_super(
     input [15:0] song_time,
     input [36:0] NDATA,
     input [37*16-1:0] metadata_link,
+    input [36:0] metadata_available,
 
     output [36:0] metadata_request,
     output [36:0] match_trigger,
@@ -14,7 +15,7 @@ module SC_note_matching_super(
 
     //create 37 note_matcher_submodules
     SC_note_matching_sub note_matcher [36:0] (.clk(clk), .song_time(song_time),
-                                                    .note_edge(note_edge), .note_time(metadata_link),
+                                                    .note_edge(note_edge), .note_time(metadata_link), .note_available(metadata_available),
                                                     .note_request(metadata_request), .match_enable(match_trigger),
                                                     .match_time(match_time));
 

Nexys4Game/src/hdl/nexys4_game.v

@@ -70,14 +70,15 @@ module nexys4_game(
     wire pause, reset;
 
     wire [37*16-1:0] metadata_link;
-    wire [36:0] metadata_request;
+    wire [36:0] metadata_request, metadata_available;
 
     SC_block SC(
         .clk(CLK100MHZ),
         .pause(pause),
         .song_time(song_time),
         .NDATA(),
         .metadata_link(metadata_link),
+        .metadata_available(metadata_available),
 
         .metadata_request(metadata_request),
         .score(),
@@ -100,6 +101,7 @@ module nexys4_game(
         .SD_SCK(),
         .SD_CMD(),
         .metadata_link(metadata_link),
+        .metadata_available(metadata_available),
         .reset(reset),
         .pause(pause),
         .song_time(song_time)