From: Joshua Wise <jwise@andrew.cmu.edu>
Date: Sat, 19 Feb 2011 07:26:36 +0000 (-0500)
Subject: initial commit
X-Git-Url: http://git.joshuawise.com/poslink.git/commitdiff_plain/93bedefa68ceca39d07560819537f768c9538bf5

initial commit
---

93bedefa68ceca39d07560819537f768c9538bf5
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..84031f7
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,76 @@
+TARGET = POSLink
+VLOGS = POSLink.v
+VLOGS_ALL = $(VLOGS)
+
+all: fpga_target
+
+scancodes.unshifted.hex: scancodes.txt
+	cut -f3 -d, scancodes.txt > scancodes.unshifted.hex
+
+scancodes.shifted.hex: scancodes.txt
+	cut -f4 -d, scancodes.txt > scancodes.shifted.hex
+
+BITGEN_OPTS = \
+	-w \
+	-g DebugBitstream:No \
+	-g Binary:no \
+	-g CRC:Enable \
+	-g ConfigRate:1 \
+	-g ProgPin:PullUp \
+	-g DonePin:PullUp \
+	-g TckPin:PullUp \
+	-g TdiPin:PullUp \
+	-g TdoPin:PullUp \
+	-g TmsPin:PullUp \
+	-g UnusedPin:PullDown \
+	-g UserID:0xFFFFFFFF \
+	-g DCMShutdown:Disable \
+	-g StartUpClk:CClk \
+	-g DONE_cycle:4 \
+	-g GTS_cycle:5 \
+	-g GWE_cycle:6 \
+	-g LCK_cycle:NoWait \
+	-g Security:None \
+	-g DonePipe:No \
+	-g DriveDone:No
+
+fpga_target: $(TARGET).svf
+
+$(TARGET).ngc: $(TARGET).xst $(VLOGS_ALL)
+	@mkdir -p xst/projnav.tmp
+	@echo work > $(TARGET).lso
+	@rm -f $(TARGET).prj
+	@for i in $(VLOGS); do echo verilog work '"'$$i'"' >> $(TARGET).prj; done
+	xst -ifn $(TARGET).xst -ofn $(TARGET).syr
+
+$(TARGET).ngd: $(TARGET).ngc $(TARGET).ucf
+	ngdbuild -dd _ngo -uc $(TARGET).ucf -nt timestamp -p xc3s1200e-fg320-5 "$(TARGET).ngc" $(TARGET).ngd
+
+$(TARGET)_map.ncd: $(TARGET).ngd
+	map -p xc3s1200e-fg320-5 -cm area -pr off -k 4 -c 100 -o $(TARGET)_map.ncd $(TARGET).ngd $(TARGET).pcf
+
+$(TARGET).ncd: $(TARGET)_map.ncd
+	par -w -ol std -t 1 $(TARGET)_map.ncd $(TARGET).ncd $(TARGET).pcf
+
+$(TARGET).twr: $(TARGET)_map.ncd
+	trce -e 3 -s 5 -xml $(TARGET) $(TARGET).ncd -o $(TARGET).twr $(TARGET).pcf -ucf $(TARGET).ucf
+
+$(TARGET).bit: $(TARGET).ncd
+	bitgen $(BITGEN_OPTS) $(TARGET).ncd
+
+$(TARGET).svf: $(TARGET).bit impact.cmd
+	sed -e s/XXX/$(subst .bit,,$<)/ < impact.cmd > tmp.cmd
+	impact -batch tmp.cmd
+
+clean:
+	rm -f $(TARGET).bgn $(TARGET).ngc $(TARGET).svf $(TARGET).ngd $(TARGET).bit $(TARGET).twr $(TARGET).ncd $(TARGET)_map.ncd $(TARGET)_map.*
+	rm -f $(TARGET).bld $(TARGET).drc $(TARGET)_ngdbuild.xrpt $(TARGET)_pad.* $(TARGET).pad $(TARGET).par $(TARGET)_par.xrpt $(TARGET).ngr
+	rm -f $(TARGET).pcf $(TARGET)_summary.xml $(TARGET).unroutes $(TARGET)_usage.xml $(TARGET)_xst.xrpt $(TARGET).syr $(TARGET).ptwx $(TARGET).xpi
+	rm -rf xst
+	rm -rf xlnx_auto_*
+	rm -rf _ngo
+	rm -f tmp.cmd
+	rm -f _impactbatch.log
+	rm -f $(TARGET).prj
+	rm -f $(TARGET).lso
+
diff --git a/POSLink.ucf b/POSLink.ucf
new file mode 100644
index 0000000..456487b
--- /dev/null
+++ b/POSLink.ucf
@@ -0,0 +1,14 @@
+NET "xtal" LOC="b8";
+
+NET "tos_inputs_e2<0>" LOC="H16";
+NET "tos_inputs_e2<1>" LOC="G13";
+NET "tos_inputs_e2<2>" LOC="J16";
+NET "tos_output"       LOC="G15";
+NET "leds<0>"          LOC="J14";
+NET "leds<1>"          LOC="J15";
+NET "leds<2>"          LOC="K15";
+NET "leds<3>"          LOC="K14";
+NET "sw<0>"            LOC="G18";
+NET "sw<1>"            LOC="H18";
+NET "sw<2>"            LOC="K18";
+NET "sw<3>"            LOC="K17";
diff --git a/POSLink.v b/POSLink.v
new file mode 100644
index 0000000..3dc9576
--- /dev/null
+++ b/POSLink.v
@@ -0,0 +1,72 @@
+module POSLink(
+	input xtal,
+	input [2:0] tos_inputs_e2,
+	input [3:0] sw,
+	output reg [3:0] leds,
+	output reg tos_output);
+	
+	reg [2:0] tos_inputs_e;
+	reg [2:0] tos_inputs;
+	wire [2:0] tos_good;
+	
+	always @(posedge xtal) begin
+		tos_inputs_e <= tos_inputs_e2;
+		tos_inputs <= tos_inputs_e;
+	end
+	
+	/* 100ns -> 1000ns */
+	
+	always @(*) begin
+		leds[3:0] = 4'h0;
+		
+		if (sw[2] || (tos_good[2] && ~sw[1] && ~sw[0])) begin
+			tos_output = tos_inputs[2];
+			leds[2] = 1;
+		end else if (sw[1] | (tos_good[1] && ~sw[0])) begin
+			tos_output = tos_inputs[1];
+			leds[1] = 1;
+		end else if (sw[0] | tos_good[0]) begin
+			tos_output = tos_inputs[0];
+			leds[0] = 1;
+		end else
+			tos_output = sw[3];
+		leds[3] = tos_output;
+	end
+	
+	TOS_Detect detect[2:0](.xtal(xtal), .tos_input(tos_inputs), .tos_good(tos_good));
+endmodule
+
+/* xtal: 50MHz (==20ns)
+ * Minimum: 100ns (we'll allow 60ns for good measure)
+ *          5 cycles (we'll allow 3 for good measure)
+ * Maximum: 1000ns (we'll allow 1200ns for good measure)
+ *          50 cycles (we'll allow 60 for good measure)
+ */
+module TOS_Detect(
+	input xtal,
+	input tos_input,
+	output reg tos_good = 0);
+	
+	reg tos_input_1a = 0;
+	always @(posedge xtal)
+		tos_input_1a <= tos_input;
+	wire transition = tos_input ^ tos_input_1a;
+	
+	reg [5:0] lasttx = 0;
+	always @(posedge xtal) begin
+		if (transition) begin
+			if (lasttx < 3) /* Too soon! */
+				tos_good <= 0;
+			else if (lasttx > 60) /* Too late! */
+				tos_good <= 0;
+			else /* OK by me. */
+				tos_good <= 1;
+			lasttx <= 0;
+		end else begin
+			if (lasttx != 63)
+				lasttx <= lasttx + 1;
+			else
+				tos_good <= 0;
+		end
+	end
+endmodule
diff --git a/POSLink.xst b/POSLink.xst
new file mode 100644
index 0000000..67af972
--- /dev/null
+++ b/POSLink.xst
@@ -0,0 +1,57 @@
+set -tmpdir "xst/projnav.tmp"
+set -xsthdpdir "xst"
+run
+-ifn POSLink.prj
+-ifmt mixed
+-ofn POSLink
+-ofmt NGC
+-p xc3s500e-5-fg320
+-top POSLink
+-opt_mode Speed
+-opt_level 1
+-iuc NO
+-lso POSLink.lso
+-keep_hierarchy NO
+-netlist_hierarchy as_optimized
+-rtlview Yes
+-glob_opt AllClockNets
+-read_cores YES
+-write_timing_constraints NO
+-cross_clock_analysis NO
+-hierarchy_separator /
+-bus_delimiter <>
+-case maintain
+-slice_utilization_ratio 100
+-bram_utilization_ratio 100
+-verilog2001 YES
+-fsm_extract YES -fsm_encoding Auto
+-safe_implementation No
+-fsm_style lut
+-ram_extract Yes
+-ram_style Auto
+-rom_extract Yes
+-mux_style Auto
+-decoder_extract YES
+-priority_extract YES
+-shreg_extract YES
+-shift_extract YES
+-xor_collapse YES
+-rom_style Auto
+-auto_bram_packing NO
+-mux_extract YES
+-resource_sharing YES
+-async_to_sync NO
+-mult_style auto
+-iobuf YES
+-max_fanout 500
+-bufg 24
+-register_duplication YES
+-register_balancing No
+-slice_packing YES
+-optimize_primitives NO
+-use_clock_enable Yes
+-use_sync_set Yes
+-use_sync_reset Yes
+-iob auto
+-equivalent_register_removal YES
+-slice_utilization_ratio_maxmargin 5
diff --git a/impact.cmd b/impact.cmd
new file mode 100644
index 0000000..752fa2b
--- /dev/null
+++ b/impact.cmd
@@ -0,0 +1,7 @@
+setMode -bs
+setCable -port svf -file "XXX.svf"
+addDevice -p 1 -file "XXX.bit"
+addDevice -p 2 -part xcf04s
+Program -p 1 -defaultVersion 0
+quit
+