感谢rtfm的提醒，
这应该属于材料工艺的范畴。。。10nm级(1xnm,1ynm,1znm)20nm级(2xnm,2ynm,2znm)Beyond 20nm, the DRAM is expected to scale two or three iterations in the 1xnm regime, which is referred to as 1xnm, 1ynm and 1znm. “1xnm is anything between 16nm to 19nm. 1ynm is defined as 14nm to 16nm. 1znm is defined by 12nm to 14nm,” said Er-Xuan Ping, managing director of memory and materials within the Silicon Systems Group at Applied Materials.
我的大概理解：就是一个工艺等级的表示，x，y，z 表示精密度依次提高，如果2xnm 代表29nm 那么 2ynm 大概是25nm左右 2z就是20nm左右。
根据已查到的资料来看，不同厂家对此定义也略有区别
PS：目前查到的资料有限，欢迎各位提供权威资料
[ 此帖被techon在2017-07-07 11:22重新编辑 ]
