--- /dev/null
+# Synplicity, Inc. constraint file
+# /home/jiri/ibm/vhdl/grlib/boards/gr-xc3s-1500/default.sdc
+# Written on Thu May 11 15:07:16 2006
+# by Synplify Pro, 7.1.1 Scope Editor
+
+#
+# Clocks
+#
+#define_clock -name {clk} -freq 50.000 -route 5.0 -clockgroup default_clkgroup
+define_clock -name {rxclki} -freq 100.000 -route 2.0 -clockgroup rxclki_clkgroup
+define_clock -name {txclk} -freq 100.000 -route 2.0 -clockgroup txclk_clkgroup
+define_clock -name {erx_clk} -freq 25.000 -route 5.0 -clockgroup erx_clkgroup
+define_clock -name {etx_clk} -freq 25.000 -route 5.0 -clockgroup etx_clkgroup
+define_clock -name {usb_clkout} -freq 60.000 -route 4.0 -clockgroup usb_clkgroup
+define_clock -name {clk50} -freq 50.000 -route 4.0 -clockgroup vga_clkgroup
+define_clock -name {ethclk} -freq 25.000 -route 4.0 -clockgroup eth_clkgroup
+define_clock -name {clk3} -freq 25.000 -route 2.0 -clockgroup eth_clkgroup
+define_clock -name {leon3mp|video_clk} -freq 50.000 -route 2.0 -clockgroup video_clkgroup
+
+#
+# Inputs/Outputs
+#
+define_clock_delay -rise {clk3} -rise {vga_clkgen|clkgen65.clk0B_derived_clock} -false
+define_clock_delay -rise {vga_clkgen|clkgen65.clk0B_derived_clock} -rise {clk3} -false
+define_clock_delay -rise {leon3mp|clkgen0.xc3s_v.clk0B_derived_clock} -rise {leon3mp|clk50} -false
+define_clock_delay -rise {leon3mp|clk50} -rise {leon3mp|clkgen0.xc3s_v.clk0B_derived_clock} -false
+
+define_output_delay -disable -default 10.00 -improve 0.00 -route 0.00 -ref clk:r
+define_input_delay -disable -default 10.00 -improve 0.00 -route 0.00 -ref clk:r
+define_output_delay 8.00 -improve 0.00 -route 0.00 -ref {usb_clkout:r}
+define_input_delay 8.00 -improve 0.00 -route 0.00 -ref {usb_clkout:r}
+
+#
+# Registers
+#
+
+#
+# Multicycle Path
+#
+
+#
+# False Path
+#
+
+#
+# Attributes
+#
+define_global_attribute syn_useioff {1}
+
+#
+# Other Constraints
+#