Clipping effect now working

clipping.v

@@ -1,15 +1,97 @@
-module eclipping_effect #( parameter
+module clipping_effect #( parameter
     data_width = 16          // data width 
 )(
     input                                   clk,
     input                                   reset,
     input   signed      [data_width-1: 0]   i_data,
     output  signed      [data_width-1: 0]   o_data,
-    input               [data_width-1: 0]   i_treshhold
+    input   signed      [data_width-1: 0]   i_treshhold,
+    input                                   i_read_done,
+    output                                  o_read_enable,
+    output                                  o_data_valid,
+    input                                   i_data_ready
 );
 
+//-------------Internal Constants---------------------------
+localparam [3:0]        IDLE         = 'd0,
+                        CLIP         = 'd1,
+                        OUTPUT       = 'd2;
+
+reg [3:0] r_state=IDLE, r_next=IDLE;
+
+reg   signed      [data_width-1: 0]     r_data = 'b0;
+reg   signed      [data_width-1: 0]     r_treshhold_p = 'b0;
+reg   signed      [data_width-1: 0]     r_treshhold_n = 'b0;
+reg                                     r_read_enable = 0;
+reg                                     r_data_valid = 0;
+
+assign  o_read_enable   = r_read_enable;
+assign  o_data_valid    = r_data_valid;
+assign  o_data          = r_data;
 
 
+//---------state register sequential always block-----------
+always @(posedge clk ) begin
+    if (reset == 1) begin
+        // clear state
+        r_state <= IDLE;
+        r_next <= IDLE;
+    end
+    else begin
+        r_state <= r_next;
+    end 
+end
+
+//----next state & outputs, combinational always block------
+
+always @(posedge clk ) begin
+    
+    case(r_state)
+        IDLE    :   begin
+                        if (i_data_ready == 1) begin
+                            r_next <= CLIP;
+                            r_data <= i_data;
+                            r_treshhold_p <= i_treshhold;
+                            r_treshhold_n <= 0 - i_treshhold;
+                            r_read_enable <= 0;
+                            r_data_valid <= 0;
+                        end
+                        else begin
+                            r_next <= IDLE;
+                            r_read_enable <= 1;     // redy to read data
+                            r_data_valid <= 0;
+                        end                     
+                    end
+        CLIP    :   begin
+                        case (r_data < 0 ) 
+                            0   :   begin           // positive number
+                                        if (r_data > r_treshhold_p)
+                                            r_data <= r_treshhold_p;
+                                    end
+                            1   :   begin           // negative number               
+                                        if (r_data < r_treshhold_n)
+                                            r_data <= r_treshhold_n;
+                                    end                  
+                        endcase
+                        r_next <= OUTPUT;
+                        r_data_valid <= 0;
+                        r_read_enable <= 0;     // read disable
+                    end
+        OUTPUT  :   begin
+                        if (i_read_done == 1) begin
+                            r_next <= IDLE;
+                            r_data_valid <= 0;
+                            r_read_enable <= 1;
+                        end
+                        else begin
+                            r_next <= OUTPUT;
+                            r_data_valid <= 1;
+                            r_read_enable <= 0;     // read disable
+                        end
+                    end
+        default: r_next <= IDLE;          // on error
+    endcase 
+end