1、一般这是什么错误：ise9.1i ERROR:Xst:528 - Multi-source in Unit <ram_ctrl> on signal <EN>
Sources are:
Signal <ram_ctrl_inst/EN> is assigned to logic
Signal <ram_ctrl_inst/WE> in Unit <ram_ctrl> is assigned to GND
Signal <ram_ctrl_inst/EN> in Unit <ram_ctrl> is assigned to GND 多源是什么意思呀，大家有遇到过这样的问题吗 2、我想用FPGA内部的RAM资源，但是生成的核不能实例化，在仿真顶层文件时它总是报错： # ** Error: (vsim-3033) make_data_top.v(22): Instantiation of 'ram' failed. The design unit was not found.
# Region: /make_data_tb_v/uut
# Searched libraries:
# C:\Modeltech_5.8a\win32\XilinxCoreLib_ver
# C:\Modeltech_5.8a\win32\unisims_ver
# work 这是什么原因，我装modelsim时生成过xilinx核，大家帮帮忙，谢谢哦 | 
