rtl: add gen_buf.v

Signed-off-by: liangkangnan <liangkangnan@163.com>

rtl/utils/gen_buf.v

@@ -0,0 +1,46 @@
+ /*                                                                      
+ Copyright 2020 Blue Liang, liangkangnan@163.com
+                                                                         
+ Licensed under the Apache License, Version 2.0 (the "License");         
+ you may not use this file except in compliance with the License.        
+ You may obtain a copy of the License at                                 
+                                                                         
+     http://www.apache.org/licenses/LICENSE-2.0                          
+                                                                         
+ Unless required by applicable law or agreed to in writing, software    
+ distributed under the License is distributed on an "AS IS" BASIS,       
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and     
+ limitations under the License.                                          
+ */
+
+// 将输入打DP拍后输出
+module gen_ticks_sync #(
+    parameter DP = 2,
+    parameter DW = 32)(
+
+    input wire rst,
+    input wire clk,
+
+    input wire[DW-1:0] din,
+    output wire[DW-1:0] dout
+
+    );
+
+    wire[DW-1:0] sync_dat[DP-1:0];
+
+    genvar i;
+
+    generate 
+        for (i = 0; i < DP; i = i + 1) begin
+            if (i == 0) begin
+                gen_rst_0_dff #(DW) rst_0_dff(clk, rst, din, sync_dat[0]);
+            end else begin
+                gen_rst_0_dff #(DW) rst_0_dff(clk, rst, sync_dat[i-1], sync_dat[i]);
+            end
+        end
+    endgenerate
+
+    assign dout = sync_dat[DP-1];
+  
+endmodule