MODELSIM仿真错误

Question

错误提示是这样的：我做的是MODELSIM下实现DDS仿真。。这是源程序，还没有做TESTBENCH。。麻烦高手指导一下啊。。很迷茫。。
vcom -work work -2002 -explicit -vopt F:/examples/mydds.vhd
Model Technology ModelSim SE vcom 6.2b Compiler 2006.07 Jul 31 2006
-- Loading package standard
** Error: F:/examples/mydds.vhd(1): near "timescal":
** Warning: [4] F:/examples/mydds.vhd(1): (vcom-1207) An abstract literal and an identifier must have a separator between them.
** Error: F:/examples/mydds.vhd(1): VHDL Compiler exiting

Answer 1

数字和后边的单位要加空格