add int_tready_reg to axis_interpolator

cores/axis_interpolator_v1_0/axis_interpolator.v

@@ -27,19 +27,22 @@ module axis_interpolator #
   reg [AXIS_TDATA_WIDTH-1:0] int_tdata_reg, int_tdata_next;
   reg [CNTR_WIDTH-1:0] int_cntr_reg, int_cntr_next;
   reg int_tvalid_reg, int_tvalid_next;
+  reg int_tready_reg, int_tready_next;
 
   always @(posedge aclk)
   begin
     if(~aresetn)
     begin
       int_tdata_reg <= {(AXIS_TDATA_WIDTH){1'b0}};
       int_tvalid_reg <= 1'b0;
+      int_tready_reg <= 1'b0;
       int_cntr_reg <= {(CNTR_WIDTH){1'b0}};
     end
     else
     begin
       int_tdata_reg <= int_tdata_next;
       int_tvalid_reg <= int_tvalid_next;
+      int_tready_reg <= int_tready_next;
       int_cntr_reg <= int_cntr_next;
     end
   end
@@ -48,12 +51,14 @@ module axis_interpolator #
   begin
     int_tdata_next = int_tdata_reg;
     int_tvalid_next = int_tvalid_reg;
+    int_tready_next = int_tready_reg;
     int_cntr_next = int_cntr_reg;
 
     if(s_axis_tvalid & ~int_tvalid_reg)
     begin
       int_tdata_next = s_axis_tdata;
       int_tvalid_next = 1'b1;
+      int_tready_next = 1'b1;
     end
 
     if(m_axis_tready & int_tvalid_reg)
@@ -64,13 +69,20 @@ module axis_interpolator #
       end
       else
       begin
-        int_tvalid_next = 1'b0;
         int_cntr_next = {(CNTR_WIDTH){1'b0}};
+        int_tdata_next = s_axis_tdata;
+        int_tvalid_next = s_axis_tvalid;
+        int_tready_next = s_axis_tvalid;
       end
     end
+
+    if(s_axis_tvalid & int_tready_reg)
+    begin
+      int_tready_next = 1'b0;
+    end
   end
 
-  assign s_axis_tready = ~int_tvalid_reg;
+  assign s_axis_tready = int_tready_reg;
   assign m_axis_tdata = int_tdata_reg;
   assign m_axis_tvalid = int_tvalid_reg;