Merge pull request #157 from azonenberg/master

Added GP_ABUF cell, support for tri-state I/O buffers in GreenPak

techlibs/greenpak4/Makefile.inc

@@ -2,6 +2,7 @@
 OBJS += techlibs/greenpak4/synth_greenpak4.o
 OBJS += techlibs/greenpak4/greenpak4_counters.o
 
+$(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/cells_extract.v))
 $(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/cells_map.v))
 $(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/cells_sim.v))
 $(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/gp_dff.lib))

techlibs/greenpak4/cells_extract.v

@@ -0,0 +1,15 @@
+//Wrapper module to patch up output of iopadmap
+module GP_IOBUF(input IN, output OUT, input OE, inout IO);
+
+	GP_IBUF ibuf(
+		.IN(IO),
+		.OUT(OUT)
+	);
+	
+	$_TBUF_ tbuf(
+		.A(IN),
+		.E(OE),
+		.Y(OUT)
+	);
+
+endmodule

techlibs/greenpak4/cells_map.v

@@ -24,6 +24,15 @@ module GP_DFFR(input D, CLK, nRST, output reg Q);
 	);
 endmodule
 
+module GP_OBUFT(input IN, input OE, output OUT);
+	GP_IOBUF _TECHMAP_REPLACE_ (
+		.IN(IN),
+		.OE(OE),
+		.IO(OUT),
+		.OUT()
+	);
+endmodule
+
 module \$lut (A, Y);
   parameter WIDTH = 0;
   parameter LUT = 0;

techlibs/greenpak4/cells_sim.v

@@ -13,6 +13,14 @@ module GP_4LUT(input IN0, IN1, IN2, IN3, output OUT);
 	assign OUT = INIT[{IN3, IN2, IN1, IN0}];
 endmodule
 
+module GP_ABUF(input wire IN, output wire OUT);
+	
+	assign OUT = IN;
+	
+	//cannot simulate mixed signal IP
+	
+endmodule
+
 module GP_ACMP(input wire PWREN, input wire VIN, input wire VREF, output reg OUT);
 
 	parameter BANDWIDTH = "HIGH";
@@ -126,6 +134,15 @@ module GP_DFFSR(input D, CLK, nSR, output reg Q);
 	end
 endmodule
 
+module GP_IBUF(input IN, output OUT);
+	assign OUT = IN;
+endmodule
+
+module GP_IOBUF(input IN, input OE, output OUT, inout IO);
+	assign OUT = IO;
+	assign IO = OE ? IN : 1'bz;
+endmodule
+
 module GP_INV(input IN, output OUT);
 	assign OUT = ~IN;
 endmodule
@@ -153,6 +170,14 @@ module GP_LFOSC(input PWRDN, output reg CLKOUT);
 	
 endmodule
 
+module GP_OBUF(input IN, output OUT);
+	assign OUT = IN;
+endmodule
+
+module GP_OBUFT(input IN, input OE, output OUT);
+	assign OUT = OE ? IN : 1'bz;
+endmodule
+
 module GP_PGA(input wire VIN_P, input wire VIN_N, input wire VIN_SEL, output reg VOUT);
 
 	parameter GAIN = 1;

techlibs/greenpak4/synth_greenpak4.cc

@@ -176,6 +176,8 @@ struct SynthGreenPAK4Pass : public ScriptPass
 		if (check_label("map_cells"))
 		{
 			run("shregmap -tech greenpak4");
+			run("iopadmap -bits -inpad GP_IBUF OUT:IN -outpad GP_OBUF IN:OUT -inoutpad GP_IBUF OUT:IN");
+			run("extract -map +/greenpak4/cells_extract.v -verbose");
 			run("dfflibmap -liberty +/greenpak4/gp_dff.lib");
 			run("techmap -map +/greenpak4/cells_map.v");
 			run("dffinit -ff GP_DFF Q INIT");