SpinalHDL（一）：此CHISEL非彼Chisel
https://zhuanlan.zhihu.com/p/89249985
scala sbt使用阿里雲的maven repository https://www.jianshu.com/p/3427c702d443
在中國，sbt訪問maven-central很慢，可以改用阿里雲的maven repository，或者jcenter作爲備選
在.sbt目錄下，新建或修改repositories文件
[repositories]
local
aliyun: http://maven.aliyun.com/nexus/content/groups/public
jcenter: http://jcenter.bintray.com
typesafe: http://repo.typesafe.com/typesafe/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext], bootOnly