QuartussII 11.0 与modelsim 进行功能仿真时正常， 但使用时序仿真时出错，
modelsim 显示的错误内容如下：
# vsim -t 1ps +transport_int_delays +transport_path_delays -sdftyp /NA=test_pwm_vhd.sdo -L maxii -L gate_work -L work -voptargs="+acc" tb_pwm
# vsim +transport_int_delays +transport_path_delays -L maxii -L gate_work -L work -voptargs=\"+acc\" -sdftyp /NA=test_pwm_vhd.sdo -t 1ps tb_pwm
** Warning: (vopt-2216) Cannot find instance 'NA' specified in sdf.
#
# ** Error: (vopt-1943) Command line SDF instance pathname "/NA" cannot be resolved.
#
# Optimization failed
# Error loading design
# Error: Error loading design
# Pausing macro execution
# MACRO ./test_pwm_run_msim_gate_vhdl.do PAUSED at line 21
modelsim 换了一个软件，之前是SE版本的，现在换成了 altera-modelsim6d 结果还是一样的错误
这该怎么搞呢？
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