# clock pin for Atlys rev C board
NET "clk"   LOC = "L15" | IOSTANDARD = LVCMOS33 ;

# 100 MHz
NET "clk"   TNM_NET = "clk" ;
TIMESPEC "TS_clk" = PERIOD "clk" 10 ns HIGH 50% ;

# Reset button
NET "resetn"  LOC = "T15" | IOSTANDARD = LVCMOS18 ;

# LEDs
NET "led<0>"  LOC = "U18" | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
NET "led<1>"  LOC = "M14" | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
NET "led<2>"  LOC = "N14" | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
NET "led<3>"  LOC = "L14" | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
NET "led<4>"  LOC = "M13" | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
NET "led<5>"  LOC = "D4"  | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
NET "led<6>"  LOC = "P16" | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
NET "led<7>"  LOC = "N12" | IOSTANDARD = LVCMOS33 | SLEW = QUIETIO ;
 
# USB serial port J17
NET "uartrx"    LOC = "A16" | IOSTANDARD = LVCMOS33 ;
NET "uarttx"    LOC = "B16" | IOSTANDARD = LVCMOS33 ;

# Audio
NET "ac97_bitclk"   LOC = "L13" | IOSTANDARD = LVCMOS33 ;
NET "ac97_sdi"      LOC = "T18" | IOSTANDARD = LVCMOS33 ;
NET "ac97_sdo"      LOC = "N16" | IOSTANDARD = LVCMOS33 ;
NET "ac97_sync"     LOC = "U17" | IOSTANDARD = LVCMOS33 ;
NET "ac97_rst"      LOC = "T17" | IOSTANDARD = LVCMOS33 ;

# Constrain bitclk to 20 MHz (actual frequency is 12.288 MHz)
NET "ac97_bitclk"   PERIOD = 50 ns HIGH 50% ;

OFFSET = IN  10 ns VALID 20 ns BEFORE "ac97_bitclk" FALLING ;
OFFSET = OUT 15 ns AFTER "ac97_bitclk" RISING ;