From f0050b851d3a88eceb84e159ca6d3ee73adfd51c Mon Sep 17 00:00:00 2001
From: Kevin Liao <kliao@quicklogic.com>
Date: Tue, 26 Jan 2021 09:43:53 -0800
Subject: [PATCH] QuickLogic physical ccff

---
 HDL/common/ql_ccff.v | 55 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 HDL/common/ql_ccff.v

diff --git a/HDL/common/ql_ccff.v b/HDL/common/ql_ccff.v
new file mode 100644
index 0000000..aabf908
--- /dev/null
+++ b/HDL/common/ql_ccff.v
@@ -0,0 +1,55 @@
+`timescale 1ns/1ps
+
+//-----------------------------------------------------
+// Function    : An embedded I/O with
+//               - An I/O isolation signal to set 
+//                 the I/O in input mode. This is to avoid
+//                 any unexpected output signals to damage
+//                 circuits outside the FPGA due to configurable
+//                 memories are not properly initialized
+//                 This feature may not be needed if the configurable
+//                 memory cell has a built-in set/reset functionality
+//               - Internal protection circuitry to ensure
+//                 clean signals at all the SOC I/O ports
+//                 This is to avoid 
+//                   - output any random signal
+//                     when the I/O is in input mode, also avoid
+//                   - driven by any random signal
+//                     when the I/O is output mode
+//
+// Note: This cell is built with Standard Cells from HD library
+//       It is already technology mapped and can be directly used
+//       for physical design
+//-----------------------------------------------------
+module QL_CCFF (
+  input RESET_B,   
+  input SE, 
+  input CFGE, 
+  input D, 
+  input SI, 
+  output Q, 
+  output CFGQN, 
+  output CFGQ, 
+  input CLK 
+);
+
+  sky130_fd_sc_hd__nand2_1 NAND2_CFGQN 	(
+                                        .A(Q),
+	  				.B(CFGE),
+                                        .X(CFGQN)
+                                        );
+  sky130_fd_sc_hd__inv_1 INV_CFGQN	(
+	  				.A(CFGQN),
+					.Y(CFGQ)
+					);
+  sky130_fd_sc_hd__sdfrtp SDFRTP (
+        .Q(Q),
+        .CLK(CLK),
+        .D(D),
+        .SCD(SI),
+        .SCE(SE),
+        .RESET_B(RESET_B)
+  );
+
+endmodule
+