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我是用的是xilinx  ise 11.1套件进行设计的。 前面的语法综合都没有问题。但到ucf文件时就出现如下问题：

我在Edit Constraints （text）输入以下代码：
NET "clk"  LOC="C9"|IOSTANDARD=LVTTL;
NET "reset" LOC="L13"|IOSTANDARD=LVTTL|pullup|DRIVE=2;

NET "LCD_rs" LOC="L18"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "LCD_rw" LOC="L17"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "LCD_e" LOC="M18"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "LCD_d<0>" LOC="R15"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "LCD_d<1>" LOC="R16"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "LCD_d<2>" LOC="P17"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "LCD_d<3>" LOC="M15"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "flash_oe" LOC="C18"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "flash_ce" LOC="D16"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;
NET "flash_we" LOC="D17"|IOSTANDARD=LVTTL|SLEW=SLOW|DRIVE=2;


但进行到Implement Design 时出现以下错误：
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(2): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(5): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(6): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(7): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(8): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(9): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(10): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(11): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(12): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(13): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.
WARNING:ConstraintSystem - In file: oklcd_ucf.ucf(14): Syntax error.  Ensure that the previous constraint specification was terminated with ';'.

麻烦哪位高手给指点一下，到底问题出现在哪里~~不胜感激！