Merge pull request #1524 from pepijndevos/gowindffinit

Gowin: add and test DFF init values

2 files changed, 270 insertions, 112 deletions

diff --git a/techlibs/gowin/cells_map.v b/techlibs/gowin/cells_map.v
index 9845e56a7..aee912256 100644
--- a/techlibs/gowin/cells_map.v
+++ b/techlibs/gowin/cells_map.v
@@ -1,133 +1,282 @@
+`default_nettype none
 //All DFF* have INIT, but the hardware is always initialised to the reset
 //value regardless. The parameter is ignored.
 
-// DFFN      D Flip-Flop with Negative-Edge Clock
-module  \$_DFF_N_ (input D, C, output Q); DFFN _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C)); endmodule
-// DFF       D Flip-Flop
-module  \$_DFF_P_ (input D, C, output Q); DFF _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C)); endmodule
+// DFFN			 D Flip-Flop with Negative-Edge Clock
+module	\$_DFF_N_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, output Q);
+	generate
+		if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+			DFFNS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(1'b0));
+		else
+			DFFN _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C));
+	endgenerate
+	wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// DFF			 D Flip-Flop
+module	\$_DFF_P_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, output Q);
+	generate
+		if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+			DFFS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(1'b0));
+		else
+			DFF _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C));
+	endgenerate
+	wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
 
-// DFFE      D Flip-Flop with Clock Enable
-module  \$_DFFE_PP_ (input D, C, E, output Q); DFFE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(E)); endmodule
-module  \$_DFFE_PN_ (input D, C, E, output Q); DFFE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(!E)); endmodule
+// DFFE			 D Flip-Flop with Clock Enable
+module	\$_DFFE_PP_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, E, output Q);
+	generate
+		if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+			DFFSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(E), .SET(1'b0));
+		else
+			DFFE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(E));
+	endgenerate
+	wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+module	\$_DFFE_PN_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, E, output Q);
+	generate
+		if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+			DFFSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(!E), .SET(1'b0));
+		else
+			DFFE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(!E));
+	endgenerate
+	wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
 
-// DFFNE     D Flip-Flop with Negative-Edge Clock and Clock Enable
-module  \$_DFFE_NP_ (input D, C, E, output Q); DFFNE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(E)); endmodule
-module  \$_DFFE_NN_ (input D, C, E, output Q); DFFNE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(!E)); endmodule
+// DFFNE		 D Flip-Flop with Negative-Edge Clock and Clock Enable
+module	\$_DFFE_NP_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, E, output Q);
+	generate
+		if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+			DFFNSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(E), .SET(1'b0));
+		else
+			DFFNE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(E));
+	endgenerate
+	wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+module	\$_DFFE_NN_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, E, output Q);
+	generate
+		if (_TECHMAP_WIREINIT_Q_ === 1'b1)
+			DFFNSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(!E), .SET(1'b0));
+		else
+			DFFNE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CE(!E));
+	endgenerate
+	wire _TECHMAP_REMOVEINIT_Q_ = 1;
+endmodule
+
+// DFFR			 D Flip-Flop with Synchronous Reset
+module	\$__DFFS_PN0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFR      D Flip-Flop with Synchronous Reset
-module  \$__DFFS_PN0_ (input D, C, R, output Q); DFFR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R)); endmodule
-module  \$__DFFS_PP0_ (input D, C, R, output Q); DFFR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R)); endmodule
+module	\$__DFFS_PP0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFNR     D Flip-Flop with Negative-Edge Clock and Synchronous Reset
-module  \$__DFFS_NN0_ (input D, C, R, output Q); DFFNR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R)); endmodule
-module  \$__DFFS_NP0_ (input D, C, R, output Q); DFFNR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R)); endmodule
+// DFFNR		 D Flip-Flop with Negative-Edge Clock and Synchronous Reset
+module	\$__DFFS_NN0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
+module	\$__DFFS_NP0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNR _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFRE     D Flip-Flop with Clock Enable and Synchronous Reset
-module  \$__DFFSE_PN0 (input D, C, R, E, output Q); DFFRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R), .CE(E)); endmodule
-module  \$__DFFSE_PP0 (input D, C, R, E, output Q); DFFRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R), .CE(E)); endmodule
+// DFFRE		 D Flip-Flop with Clock Enable and Synchronous Reset
+module	\$__DFFSE_PN0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
+module	\$__DFFSE_PP0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFNRE    D Flip-Flop with Negative-Edge Clock,Clock Enable, and Synchronous Reset
-module  \$__DFFNSE_PN0 (input D, C, R, E, output Q); DFFNRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R), .CE(E)); endmodule
-module  \$__DFFNSE_PP0 (input D, C, R, E, output Q); DFFNRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R), .CE(E)); endmodule
+// DFFNRE		 D Flip-Flop with Negative-Edge Clock,Clock Enable, and Synchronous Reset
+module	\$__DFFSE_NN0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
+module	\$__DFFSE_NP0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNRE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .RESET(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFS      D Flip-Flop with Synchronous Set
-module  \$__DFFS_PN1_ (input D, C, R, output Q); DFFS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R)); endmodule
-module  \$__DFFS_PP1_ (input D, C, R, output Q); DFFS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R)); endmodule
+// DFFS			 D Flip-Flop with Synchronous Set
+module	\$__DFFS_PN1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$__DFFS_PP1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFNS     D Flip-Flop with Negative-Edge Clock and Synchronous Set
-module  \$__DFFS_NN1_ (input D, C, R, output Q); DFFNS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R)); endmodule
-module  \$__DFFS_NP1_ (input D, C, R, output Q); DFFNS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R)); endmodule
+// DFFNS		 D Flip-Flop with Negative-Edge Clock and Synchronous Set
+module	\$__DFFS_NN1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$__DFFS_NP1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNS _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFSE     D Flip-Flop with Clock Enable and Synchronous Set
-module  \$__DFFSE_PN1 (input D, C, R, E, output Q); DFFSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R), .CE(E)); endmodule
-module  \$__DFFSE_PP1 (input D, C, R, E, output Q); DFFSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R), .CE(E)); endmodule
+// DFFSE		 D Flip-Flop with Clock Enable and Synchronous Set
+module	\$__DFFSE_PN1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$__DFFSE_PP1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFNSE    D Flip-Flop with Negative-Edge Clock,Clock Enable,and Synchronous Set
-module  \$__DFFSE_NN1 (input D, C, R, E, output Q); DFFNSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R), .CE(E)); endmodule
-module  \$__DFFSE_NP1 (input D, C, R, E, output Q); DFFNSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R), .CE(E)); endmodule
+// DFFNSE		 D Flip-Flop with Negative-Edge Clock,Clock Enable,and Synchronous Set
+module	\$__DFFSE_NN1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$__DFFSE_NP1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNSE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .SET(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFP      D Flip-Flop with Asynchronous Preset
-module  \$_DFF_PP1_ (input D, C, R, output Q); DFFP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R)); endmodule
-module  \$_DFF_PN1_ (input D, C, R, output Q); DFFP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R)); endmodule
+// DFFP			 D Flip-Flop with Asynchronous Preset
+module	\$_DFF_PP1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$_DFF_PN1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFNP     D Flip-Flop with Negative-Edge Clock and Asynchronous Preset
-module  \$_DFF_NP1_ (input D, C, R, output Q); DFFNP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R)); endmodule
-module  \$_DFF_NN1_ (input D, C, R, output Q); DFFNP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R)); endmodule
+// DFFNP		 D Flip-Flop with Negative-Edge Clock and Asynchronous Preset
+module	\$_DFF_NP1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$_DFF_NN1_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNP _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFC      D Flip-Flop with Asynchronous Clear
-module  \$_DFF_PP0_ (input D, C, R, output Q); DFFC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R)); endmodule
-module  \$_DFF_PN0_ (input D, C, R, output Q); DFFC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R)); endmodule
+// DFFC			 D Flip-Flop with Asynchronous Clear
+module	\$_DFF_PP0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
+module	\$_DFF_PN0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFNC     D Flip-Flop with Negative-Edge Clock and Asynchronous Clear
-module  \$_DFF_NP0_ (input D, C, R, output Q); DFFNC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R)); endmodule
-module  \$_DFF_NN0_ (input D, C, R, output Q); DFFNC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R)); endmodule
+// DFFNC		 D Flip-Flop with Negative-Edge Clock and Asynchronous Clear
+module	\$_DFF_NP0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
+module	\$_DFF_NN0_ #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, output Q);
+	DFFNC _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFPE     D Flip-Flop with Clock Enable and Asynchronous Preset
-module  \$__DFFE_PP1 (input D, C, R, E, output Q); DFFPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R), .CE(E)); endmodule
-module  \$__DFFE_PN1 (input D, C, R, E, output Q); DFFPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R), .CE(E)); endmodule
+// DFFPE		 D Flip-Flop with Clock Enable and Asynchronous Preset
+module	\$__DFFE_PP1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$__DFFE_PN1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFNPE    D Flip-Flop with Negative-Edge Clock,Clock Enable, and Asynchronous Preset
-module  \$__DFFE_NP1 (input D, C, R, E, output Q); DFFNPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R), .CE(E)); endmodule
-module  \$__DFFE_NN1 (input D, C, R, E, output Q); DFFNPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R), .CE(E)); endmodule
+// DFFNPE		 D Flip-Flop with Negative-Edge Clock,Clock Enable, and Asynchronous Preset
+module	\$__DFFE_NP1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
+module	\$__DFFE_NN1 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNPE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .PRESET(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b0;
+endmodule
 
-// DFFCE     D Flip-Flop with Clock Enable and Asynchronous Clear
-module  \$__DFFE_PP0 (input D, C, R, E, output Q); DFFCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R), .CE(E)); endmodule
-module  \$__DFFE_PN0 (input D, C, R, E, output Q); DFFCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R), .CE(E)); endmodule
+// DFFCE		 D Flip-Flop with Clock Enable and Asynchronous Clear
+module	\$__DFFE_PP0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
+module	\$__DFFE_PN0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
-// DFFNCE    D Flip-Flop with Negative-Edge Clock,Clock Enable and Asynchronous Clear
-module  \$__DFFE_NP0 (input D, C, R, E, output Q); DFFNCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R), .CE(E)); endmodule
-module  \$__DFFE_NN0 (input D, C, R, E, output Q); DFFNCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R), .CE(E)); endmodule
+// DFFNCE		 D Flip-Flop with Negative-Edge Clock,Clock Enable and Asynchronous Clear
+module	\$__DFFE_NP0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
+module	\$__DFFE_NN0 #(parameter _TECHMAP_WIREINIT_Q_ = 1'bx) (input D, C, R, E, output Q);
+	DFFNCE _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C), .CLEAR(!R), .CE(E));
+	wire _TECHMAP_REMOVEINIT_Q_ = _TECHMAP_WIREINIT_Q_ !== 1'b1;
+endmodule
 
 
 module \$lut (A, Y);
-  parameter WIDTH = 0;
-  parameter LUT = 0;
-
-  input [WIDTH-1:0] A;
-  output Y;
-
-  generate
-    if (WIDTH == 1) begin
-      LUT1 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
-        .I0(A[0]));
-    end else
-    if (WIDTH == 2) begin
-      LUT2 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
-        .I0(A[0]), .I1(A[1]));
-    end else
-    if (WIDTH == 3) begin
-      LUT3 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
-        .I0(A[0]), .I1(A[1]), .I2(A[2]));
-    end else
-    if (WIDTH == 4) begin
-      LUT4 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
-        .I0(A[0]), .I1(A[1]), .I2(A[2]), .I3(A[3]));
-    end else
-    if (WIDTH == 5) begin
-      wire f0, f1;
-      \$lut #(.LUT(LUT[15: 0]), .WIDTH(4)) lut0 (.A(A[3:0]), .Y(f0));
-      \$lut #(.LUT(LUT[31:16]), .WIDTH(4)) lut1 (.A(A[3:0]), .Y(f1));
-      MUX2_LUT5 mux5(.I0(f0), .I1(f1), .S0(A[4]), .O(Y));
-    end else
-    if (WIDTH == 6) begin
-      wire f0, f1;
-      \$lut #(.LUT(LUT[31: 0]), .WIDTH(5)) lut0 (.A(A[4:0]), .Y(f0));
-      \$lut #(.LUT(LUT[63:32]), .WIDTH(5)) lut1 (.A(A[4:0]), .Y(f1));
-      MUX2_LUT6 mux6(.I0(f0), .I1(f1), .S0(A[5]), .O(Y));
-    end else
-    if (WIDTH == 7) begin
-      wire f0, f1;
-      \$lut #(.LUT(LUT[63: 0]), .WIDTH(6)) lut0 (.A(A[5:0]), .Y(f0));
-      \$lut #(.LUT(LUT[127:64]), .WIDTH(6)) lut1 (.A(A[5:0]), .Y(f1));
-      MUX2_LUT7 mux7(.I0(f0), .I1(f1), .S0(A[6]), .O(Y));
-    end else
-    if (WIDTH == 8) begin
-      wire f0, f1;
-      \$lut #(.LUT(LUT[127: 0]), .WIDTH(7)) lut0 (.A(A[6:0]), .Y(f0));
-      \$lut #(.LUT(LUT[255:128]), .WIDTH(7)) lut1 (.A(A[6:0]), .Y(f1));
-      MUX2_LUT8 mux8(.I0(f0), .I1(f1), .S0(A[7]), .O(Y));
-    end else begin
-      wire _TECHMAP_FAIL_ = 1;
-    end
-  endgenerate
+	parameter WIDTH = 0;
+	parameter LUT = 0;
+
+	input [WIDTH-1:0] A;
+	output Y;
+
+	generate
+		if (WIDTH == 1) begin
+			LUT1 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
+				.I0(A[0]));
+		end else
+		if (WIDTH == 2) begin
+			LUT2 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
+				.I0(A[0]), .I1(A[1]));
+		end else
+		if (WIDTH == 3) begin
+			LUT3 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
+				.I0(A[0]), .I1(A[1]), .I2(A[2]));
+		end else
+		if (WIDTH == 4) begin
+			LUT4 #(.INIT(LUT)) _TECHMAP_REPLACE_ (.F(Y),
+				.I0(A[0]), .I1(A[1]), .I2(A[2]), .I3(A[3]));
+		end else
+		if (WIDTH == 5) begin
+			wire f0, f1;
+			\$lut #(.LUT(LUT[15: 0]), .WIDTH(4)) lut0 (.A(A[3:0]), .Y(f0));
+			\$lut #(.LUT(LUT[31:16]), .WIDTH(4)) lut1 (.A(A[3:0]), .Y(f1));
+			MUX2_LUT5 mux5(.I0(f0), .I1(f1), .S0(A[4]), .O(Y));
+		end else
+		if (WIDTH == 6) begin
+			wire f0, f1;
+			\$lut #(.LUT(LUT[31: 0]), .WIDTH(5)) lut0 (.A(A[4:0]), .Y(f0));
+			\$lut #(.LUT(LUT[63:32]), .WIDTH(5)) lut1 (.A(A[4:0]), .Y(f1));
+			MUX2_LUT6 mux6(.I0(f0), .I1(f1), .S0(A[5]), .O(Y));
+		end else
+		if (WIDTH == 7) begin
+			wire f0, f1;
+			\$lut #(.LUT(LUT[63: 0]), .WIDTH(6)) lut0 (.A(A[5:0]), .Y(f0));
+			\$lut #(.LUT(LUT[127:64]), .WIDTH(6)) lut1 (.A(A[5:0]), .Y(f1));
+			MUX2_LUT7 mux7(.I0(f0), .I1(f1), .S0(A[6]), .O(Y));
+		end else
+		if (WIDTH == 8) begin
+			wire f0, f1;
+			\$lut #(.LUT(LUT[127: 0]), .WIDTH(7)) lut0 (.A(A[6:0]), .Y(f0));
+			\$lut #(.LUT(LUT[255:128]), .WIDTH(7)) lut1 (.A(A[6:0]), .Y(f1));
+			MUX2_LUT8 mux8(.I0(f0), .I1(f1), .S0(A[7]), .O(Y));
+		end else begin
+			wire _TECHMAP_FAIL_ = 1;
+		end
+	endgenerate
 endmodule
diff --git a/techlibs/gowin/synth_gowin.cc b/techlibs/gowin/synth_gowin.cc
index 3c1426414..6cf058f29 100644
--- a/techlibs/gowin/synth_gowin.cc
+++ b/techlibs/gowin/synth_gowin.cc
@@ -67,6 +67,9 @@ struct SynthGowinPass : public ScriptPass
 		log("    -nowidelut\n");
 		log("        do not use muxes to implement LUTs larger than LUT4s\n");
 		log("\n");
+		log("    -noiopads\n");
+		log("        do not emit IOB at top level ports\n");
+		log("\n");
 		log("    -abc9\n");
 		log("        use new ABC9 flow (EXPERIMENTAL)\n");
 		log("\n");
@@ -77,7 +80,7 @@ struct SynthGowinPass : public ScriptPass
 	}
 
 	string top_opt, vout_file;
-	bool retime, nobram, nodram, flatten, nodffe, nowidelut, abc9;
+	bool retime, nobram, nodram, flatten, nodffe, nowidelut, abc9, noiopads;
 
 	void clear_flags() YS_OVERRIDE
 	{
@@ -90,6 +93,7 @@ struct SynthGowinPass : public ScriptPass
 		nodram = false;
 		nowidelut = false;
 		abc9 = false;
+		noiopads = false;
 	}
 
 	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -144,6 +148,10 @@ struct SynthGowinPass : public ScriptPass
 				abc9 = true;
 				continue;
 			}
+			if (args[argidx] == "-noiopads") {
+				noiopads = true;
+				continue;
+			}
 			break;
 		}
 		extra_args(args, argidx, design);
@@ -208,7 +216,7 @@ struct SynthGowinPass : public ScriptPass
 		if (check_label("map_ffs"))
 		{
 			run("dffsr2dff");
-			run("dff2dffs");
+			run("dff2dffs -match-init");
 			run("opt_clean");
 			if (!nodffe)
 				run("dff2dffe -direct-match $_DFF_* -direct-match $__DFFS_*");
@@ -236,8 +244,9 @@ struct SynthGowinPass : public ScriptPass
 			run("techmap -map +/gowin/cells_map.v");
 			run("setundef -undriven -params -zero");
 			run("hilomap -singleton -hicell VCC V -locell GND G");
-			run("iopadmap -bits -inpad IBUF O:I -outpad OBUF I:O "
-				"-toutpad TBUF OEN:I:O -tinoutpad IOBUF OEN:O:I:IO", "(unless -noiopads)");
+			if (!noiopads || help_mode)
+				run("iopadmap -bits -inpad IBUF O:I -outpad OBUF I:O "
+					"-toutpad TBUF OEN:I:O -tinoutpad IOBUF OEN:O:I:IO", "(unless -noiopads)");
 			run("clean");
 
 		}