初学CPLD,编个接收1553B数据的小程序。前面综合,翻译都通过了,就是到映射过不去,编译的结果总是报同样的错误,如下:Mapping a total of 236 equation into 16 function blocks Error:CPLD:892 Cannot place signal init_reg<1>.Consider reducing the collapsing input limit or the product term limit to prevent the fitter from creating high input and / or high product term functions.
CPLD:868 Cannot fit the design into any of the soecified devices with the selected implementation options.