From 5b5756b91ee6b514021afbe857135801f3cdcc33 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Fri, 27 Sep 2019 12:49:57 -0700
Subject: [PATCH] Add LDCE/LDPE sim library, remove from *cells_xtra.{v,py}

---
 techlibs/xilinx/cells_sim.v       | 44 +++++++++++++++++++++++++++++++
 techlibs/xilinx/cells_xtra.py     |  4 +--
 techlibs/xilinx/xc6s_cells_xtra.v | 30 ---------------------
 techlibs/xilinx/xc6v_cells_xtra.v | 30 ---------------------
 techlibs/xilinx/xc7_cells_xtra.v  | 30 ---------------------
 techlibs/xilinx/xcu_cells_xtra.v  | 30 ---------------------
 6 files changed, 46 insertions(+), 122 deletions(-)

diff --git a/techlibs/xilinx/cells_sim.v b/techlibs/xilinx/cells_sim.v
index 0b6341938..258999f18 100644
--- a/techlibs/xilinx/cells_sim.v
+++ b/techlibs/xilinx/cells_sim.v
@@ -384,6 +384,50 @@ module FDPE_1 (
   always @(negedge C, posedge PRE) if (PRE) Q <= 1'b1; else if (CE) Q <= D;
 endmodule
 
+module LDCE (
+  output reg Q,
+  (* invertible_pin = "IS_CLR_INVERTED" *)
+  input CLR,
+  input D,
+  (* invertible_pin = "IS_G_INVERTED" *)
+  input G,
+  input GE
+);
+  parameter [0:0] INIT = 1'b0;
+  parameter [0:0] IS_CLR_INVERTED = 1'b0;
+  parameter [0:0] IS_G_INVERTED = 1'b0;
+  parameter MSGON = "TRUE";
+  parameter XON = "TRUE";
+  initial Q = INIT;
+  wire clr = CLR ^ IS_CLR_INVERTED;
+  wire g = G ^ IS_G_INVERTED;
+  always @*
+    if (clr) Q = 1'b0;
+    else if (GE && g) Q = D;
+endmodule
+
+module LDPE (
+  output reg Q,
+  input D,
+  (* invertible_pin = "IS_G_INVERTED" *)
+  input G,
+  input GE,
+  (* invertible_pin = "IS_PRE_INVERTED" *)
+  input PRE
+);
+  parameter [0:0] INIT = 1'b1;
+  parameter [0:0] IS_G_INVERTED = 1'b0;
+  parameter [0:0] IS_PRE_INVERTED = 1'b0;
+  parameter MSGON = "TRUE";
+  parameter XON = "TRUE";
+  initial Q = INIT;
+  wire g = G ^ IS_G_INVERTED;
+  wire pre = PRE ^ IS_PRE_INVERTED;
+  always @*
+    if (pre) Q = 1'b1;
+    else if (GE && g) Q = D;
+endmodule
+
 module RAM32X1D (
   // Max delay from: https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLM_R.sdf#L957
   (* abc_arrival=1153 *)
diff --git a/techlibs/xilinx/cells_xtra.py b/techlibs/xilinx/cells_xtra.py
index 561a61943..13dbc0e14 100644
--- a/techlibs/xilinx/cells_xtra.py
+++ b/techlibs/xilinx/cells_xtra.py
@@ -108,8 +108,8 @@ XC6S_CELLS = [
     # Cell('FDRE'),
     # Cell('FDSE'),
     Cell('IDDR2', port_attrs={'C0': ['clkbuf_sink'], 'C1': ['clkbuf_sink']}),
-    Cell('LDCE'),
-    Cell('LDPE'),
+    # Cell('LDCE'),
+    # Cell('LDPE'),
     Cell('ODDR2', port_attrs={'C0': ['clkbuf_sink'], 'C1': ['clkbuf_sink']}),
 
     # Slice/CLB primitives.
diff --git a/techlibs/xilinx/xc6s_cells_xtra.v b/techlibs/xilinx/xc6s_cells_xtra.v
index 014e73df0..f8dcce81d 100644
--- a/techlibs/xilinx/xc6s_cells_xtra.v
+++ b/techlibs/xilinx/xc6s_cells_xtra.v
@@ -1793,36 +1793,6 @@ module IDDR2 (...);
     input S;
 endmodule
 
-module LDCE (...);
-    parameter [0:0] INIT = 1'b0;
-    parameter [0:0] IS_CLR_INVERTED = 1'b0;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    (* invertible_pin = "IS_CLR_INVERTED" *)
-    input CLR;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-endmodule
-
-module LDPE (...);
-    parameter [0:0] INIT = 1'b1;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter [0:0] IS_PRE_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-    (* invertible_pin = "IS_PRE_INVERTED" *)
-    input PRE;
-endmodule
-
 module ODDR2 (...);
     parameter DDR_ALIGNMENT = "NONE";
     parameter [0:0] INIT = 1'b0;
diff --git a/techlibs/xilinx/xc6v_cells_xtra.v b/techlibs/xilinx/xc6v_cells_xtra.v
index 263bcc69d..b228e404d 100644
--- a/techlibs/xilinx/xc6v_cells_xtra.v
+++ b/techlibs/xilinx/xc6v_cells_xtra.v
@@ -2648,36 +2648,6 @@ module IDDR_2CLK (...);
     input S;
 endmodule
 
-module LDCE (...);
-    parameter [0:0] INIT = 1'b0;
-    parameter [0:0] IS_CLR_INVERTED = 1'b0;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    (* invertible_pin = "IS_CLR_INVERTED" *)
-    input CLR;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-endmodule
-
-module LDPE (...);
-    parameter [0:0] INIT = 1'b1;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter [0:0] IS_PRE_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-    (* invertible_pin = "IS_PRE_INVERTED" *)
-    input PRE;
-endmodule
-
 module ODDR (...);
     parameter DDR_CLK_EDGE = "OPPOSITE_EDGE";
     parameter INIT = 1'b0;
diff --git a/techlibs/xilinx/xc7_cells_xtra.v b/techlibs/xilinx/xc7_cells_xtra.v
index 817932e9f..0d16f81c3 100644
--- a/techlibs/xilinx/xc7_cells_xtra.v
+++ b/techlibs/xilinx/xc7_cells_xtra.v
@@ -5149,36 +5149,6 @@ module IDDR_2CLK (...);
     input S;
 endmodule
 
-module LDCE (...);
-    parameter [0:0] INIT = 1'b0;
-    parameter [0:0] IS_CLR_INVERTED = 1'b0;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    (* invertible_pin = "IS_CLR_INVERTED" *)
-    input CLR;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-endmodule
-
-module LDPE (...);
-    parameter [0:0] INIT = 1'b1;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter [0:0] IS_PRE_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-    (* invertible_pin = "IS_PRE_INVERTED" *)
-    input PRE;
-endmodule
-
 module ODDR (...);
     parameter DDR_CLK_EDGE = "OPPOSITE_EDGE";
     parameter INIT = 1'b0;
diff --git a/techlibs/xilinx/xcu_cells_xtra.v b/techlibs/xilinx/xcu_cells_xtra.v
index 2d331a221..4523b5210 100644
--- a/techlibs/xilinx/xcu_cells_xtra.v
+++ b/techlibs/xilinx/xcu_cells_xtra.v
@@ -10731,36 +10731,6 @@ module IDDRE1 (...);
     input R;
 endmodule
 
-module LDCE (...);
-    parameter [0:0] INIT = 1'b0;
-    parameter [0:0] IS_CLR_INVERTED = 1'b0;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    (* invertible_pin = "IS_CLR_INVERTED" *)
-    input CLR;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-endmodule
-
-module LDPE (...);
-    parameter [0:0] INIT = 1'b1;
-    parameter [0:0] IS_G_INVERTED = 1'b0;
-    parameter [0:0] IS_PRE_INVERTED = 1'b0;
-    parameter MSGON = "TRUE";
-    parameter XON = "TRUE";
-    output Q;
-    input D;
-    (* invertible_pin = "IS_G_INVERTED" *)
-    input G;
-    input GE;
-    (* invertible_pin = "IS_PRE_INVERTED" *)
-    input PRE;
-endmodule
-
 module ODDRE1 (...);
     parameter [0:0] IS_C_INVERTED = 1'b0;
     parameter [0:0] IS_D1_INVERTED = 1'b0;
-- 
2.30.2