# Constraints for Digilent XC3S200 board.
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# Constraints for Digilent XC3S200 board.
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# Board clock, 50 MHz = 20 ns nominal, - 2 ns margin = 18 ns
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# Board clock, 50 MHz = 20 ns nominal, - 2 ns margin = 18 ns
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NET "clk50" TNM_NET = "clk50" ;
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NET "clk50" TNM_NET = "clk50" ;
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TIMESPEC "TS_clk" = PERIOD "clk50" 18.0 ns ;
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TIMESPEC "TS_clk" = PERIOD "clk50" 18.0 ns ;
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# Paths between fastclk and sysclk must be constrained to fastclk period.
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# Paths between fastclk and sysclk must be constrained to fastclk period.
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# fastclk = 200 MHz = 5 ns = 3 ns delay + 2 ns skew
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# fastclk = 200 MHz = 5 ns = 4 ns delay + 1 ns margin
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NET "sysclk" TNM_NET = "sysclk" | MAXSKEW = 1 ns;
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NET "sysclk" TNM_NET = "sysclk" ;
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NET "fastclk" TNM_NET = "fastclk" | MAXSKEW = 1 ns;
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NET "fastclk" TNM_NET = "fastclk" ;
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TIMESPEC "TS_fast_to_sys" = FROM "fastclk" TO "sysclk" 3 ns DATAPATHONLY ;
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TIMESPEC "TS_fast_to_sys" = FROM "fastclk" TO "sysclk" 4 ns DATAPATHONLY ;
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TIMESPEC "TS_sys_to_fast" = FROM "sysclk" TO "fastclk" 3 ns DATAPATHONLY ;
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TIMESPEC "TS_sys_to_fast" = FROM "sysclk" TO "fastclk" 4 ns DATAPATHONLY ;
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TIMESPEC "TS_sync" = FROM FFS("*/syncdff_ff1") TO FFS("*/syncdff_ff2") 2 ns ;
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NET "clk50" LOC = "T9" ;
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NET "clk50" LOC = "T9" ;
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NET "led(0)" LOC = "K12" | DRIVE = 6 ;
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NET "led(0)" LOC = "K12" | DRIVE = 6 ;
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NET "led(1)" LOC = "P14" | DRIVE = 6 ;
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NET "led(1)" LOC = "P14" | DRIVE = 6 ;
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NET "led(2)" LOC = "L12" | DRIVE = 6 ;
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NET "led(2)" LOC = "L12" | DRIVE = 6 ;
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NET "led(3)" LOC = "N14" | DRIVE = 6 ;
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NET "led(3)" LOC = "N14" | DRIVE = 6 ;
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NET "led(4)" LOC = "P13" | DRIVE = 6 ;
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NET "led(4)" LOC = "P13" | DRIVE = 6 ;
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NET "led(5)" LOC = "N12" | DRIVE = 6 ;
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NET "led(5)" LOC = "N12" | DRIVE = 6 ;
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NET "led(6)" LOC = "P12" | DRIVE = 6 ;
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NET "led(6)" LOC = "P12" | DRIVE = 6 ;
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NET "led(7)" LOC = "P11" | DRIVE = 6 ;
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NET "led(7)" LOC = "P11" | DRIVE = 6 ;
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NET "button(0)" LOC = "M13" ;
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NET "button(0)" LOC = "M13" ;
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NET "button(1)" LOC = "M14" ;
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NET "button(1)" LOC = "M14" ;
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NET "button(2)" LOC = "L13" ;
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NET "button(2)" LOC = "L13" ;
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NET "button(3)" LOC = "L14" ;
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NET "button(3)" LOC = "L14" ;
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NET "switch(0)" LOC = "F12" ;
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NET "switch(0)" LOC = "F12" ;
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NET "switch(1)" LOC = "G12" ;
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NET "switch(1)" LOC = "G12" ;
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NET "switch(2)" LOC = "H14" ;
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NET "switch(2)" LOC = "H14" ;
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NET "switch(3)" LOC = "H13" ;
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NET "switch(3)" LOC = "H13" ;
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NET "switch(4)" LOC = "J14" ;
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NET "switch(4)" LOC = "J14" ;
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NET "switch(5)" LOC = "J13" ;
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NET "switch(5)" LOC = "J13" ;
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NET "switch(6)" LOC = "K14" ;
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NET "switch(6)" LOC = "K14" ;
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NET "switch(7)" LOC = "K13" ;
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NET "switch(7)" LOC = "K13" ;
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NET "spw_di_p" LOC = "B5" ; # | IOSTANDARD = LVDS_25;
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NET "spw_di_p" LOC = "B5" ; # | IOSTANDARD = LVDS_25;
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NET "spw_di_n" LOC = "C5" ; # | IOSTANDARD = LVDS_25;
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NET "spw_di_n" LOC = "C5" ; # | IOSTANDARD = LVDS_25;
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NET "spw_si_p" LOC = "D6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_si_p" LOC = "D6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_si_n" LOC = "E6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_si_n" LOC = "E6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_do_p" LOC = "B6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_do_p" LOC = "B6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_do_n" LOC = "C6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_do_n" LOC = "C6" ; # | IOSTANDARD = LVDS_25;
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NET "spw_so_p" LOC = "D7" ; # | IOSTANDARD = LVDS_25;
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NET "spw_so_p" LOC = "D7" ; # | IOSTANDARD = LVDS_25;
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NET "spw_so_n" LOC = "E7" ; # | IOSTANDARD = LVDS_25;
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NET "spw_so_n" LOC = "E7" ; # | IOSTANDARD = LVDS_25;
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