From ff53d2c37539187a6699fff62b2c1ae42ba07512 Mon Sep 17 00:00:00 2001
From: tangxifan <tangxifan@gmail.com>
Date: Mon, 30 Nov 2020 17:54:10 -0700
Subject: [PATCH] [HDL] Add new Scan-chain DFF cell

---
 .../openfpga_cell_library/verilog/dff.v       | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/openfpga_flow/openfpga_cell_library/verilog/dff.v b/openfpga_flow/openfpga_cell_library/verilog/dff.v
index 99bb50c85..e54950827 100644
--- a/openfpga_flow/openfpga_cell_library/verilog/dff.v
+++ b/openfpga_flow/openfpga_cell_library/verilog/dff.v
@@ -332,6 +332,37 @@ end
 
 endmodule //End Of Module
 
+//-----------------------------------------------------
+// Function    : D-type flip-flop with 
+//               - asynchronous active high reset
+//               - scan-chain input
+//               - a scan-chain enable 
+//-----------------------------------------------------
+module SDFFRQ (
+  input RST, // Reset input
+  input CK, // Clock Input
+  input SE, // Scan-chain Enable
+  input D, // Data Input
+  input SI, // Scan-chain input
+  output Q // Q output
+);
+//------------Internal Variables--------
+reg q_reg;
+
+//-------------Code Starts Here---------
+always @ ( posedge CK or posedge RST)
+if (RST) begin
+  q_reg <= 1'b0;
+end else if (SE) begin
+  q_reg <= SI;
+end else begin
+  q_reg <= D;
+end
+
+assign Q = q_reg;
+
+endmodule //End Of Module
+
 //-----------------------------------------------------
 // Function    : D-type flip-flop with 
 //               - asynchronous active high reset