# Constraints for reference design 'LCD_IF'.
#
# Revision C of the Spartan-3E Starter Kit.
#
# Kahraman Akdemir -- Fall 2006
#
# Period constraint for 50MHz operation
#
NET "clk" PERIOD = 20 ns HIGH 50 %;

# soldered 50MHz Clock.
NET "clk" LOC = C9;
NET "clk" IOSTANDARD = LVTTL;

# LCD display
# Very slow so can use lowest drive strength. 
#
NET "lcd_rs" LOC = L18;
NET "lcd_rs" IOSTANDARD = LVTTL;
NET "lcd_rs" DRIVE = 2;
NET "lcd_rs" SLEW = SLOW;
NET "lcd_rw" LOC = L17;
NET "lcd_rw" IOSTANDARD = LVTTL;
NET "lcd_rw" DRIVE = 2;
NET "lcd_rw" SLEW = SLOW;
NET "lcd_e" LOC = M18;
NET "lcd_e" IOSTANDARD = LVTTL;
NET "lcd_e" DRIVE = 2;
NET "lcd_e" SLEW = SLOW;
NET "lcd_d[4]" LOC = R15;
NET "lcd_d[4]" IOSTANDARD = LVTTL;
NET "lcd_d[4]" DRIVE = 2;
NET "lcd_d[4]" SLEW = SLOW;
NET "lcd_d[5]" LOC = R16;
NET "lcd_d[5]" IOSTANDARD = LVTTL;
NET "lcd_d[5]" DRIVE = 2;
NET "lcd_d[5]" SLEW = SLOW;
NET "lcd_d[6]" LOC = P17;
NET "lcd_d[6]" IOSTANDARD = LVTTL;
NET "lcd_d[6]" DRIVE = 2;
NET "lcd_d[6]" SLEW = SLOW;
NET "lcd_d[7]" LOC = M15;
NET "lcd_d[7]" IOSTANDARD = LVTTL;
NET "lcd_d[7]" DRIVE = 2;
NET "lcd_d[7]" SLEW = SLOW;
#
# Strata Flash (need to disable to use LCD display) 
#
NET "strataflash_oe" LOC = C18;
NET "strataflash_oe" IOSTANDARD = LVTTL;
NET "strataflash_oe" DRIVE = 2;
NET "strataflash_oe" SLEW = SLOW;
NET "strataflash_ce" LOC = D16;
NET "strataflash_ce" IOSTANDARD = LVTTL;
NET "strataflash_ce" DRIVE = 2;
NET "strataflash_ce" SLEW = SLOW;
NET "strataflash_we" LOC = D17;
NET "strataflash_we" IOSTANDARD = LVTTL;
NET "strataflash_we" DRIVE = 2;
NET "strataflash_we" SLEW = SLOW;

# End of File


NET "din[7]" LOC = N17;
NET "din[6]" LOC = H18;
NET "din[5]" LOC = L14;
NET "din[4]" LOC = L13;
NET "din[3]" LOC = A6;
NET "din[2]" LOC = B6;
NET "din[0]" LOC = F7;
NET "din[1]" LOC = E7;
NET "dout[7]" LOC = F9;
NET "dout[6]" LOC = E9;
NET "dout[5]" LOC = D11;
NET "dout[4]" LOC = C11;
NET "dout[3]" LOC = F11;
NET "dout[2]" LOC = E11;
NET "dout[1]" LOC = E12;
NET "dout[0]" LOC = F12;
NET "speed" LOC = B4;


NET "dout[7]" IOSTANDARD = LVTTL;
NET "dout[6]" IOSTANDARD = LVTTL;
NET "dout[5]" IOSTANDARD = LVTTL;
NET "dout[4]" IOSTANDARD = LVTTL;
NET "dout[3]" IOSTANDARD = LVTTL;
NET "dout[2]" IOSTANDARD = LVTTL;
NET "dout[1]" IOSTANDARD = LVTTL;
NET "dout[0]" IOSTANDARD = LVTTL;


NET "comms_watch" LOC = D7;


NET "comms_watch" IOSTANDARD = LVTTL;

# PlanAhead Generated physical constraints 

NET "ready_to_transmit" LOC = A4;