Nan Yang
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Not every country have the skills to manufacture 7n using DUV at high yield. There is a learning curve. The more you make the more you learn.but..but..looky here aren't you forgetting something...ASML already said it could be done.
Nov 5, 2020
ASML demonstrates DUV mask aligner for 7nm processes in China - CnTechPost
The mask aligner manufacturing giant ASML is present at the ongoing 3rd China Import Expo, and is exhibiting the DUV mask aligner at its own booth, Chinese media reported.cntechpost.com
Then..shhh..then make sure to tell Huawei that they were stupid to be out of the market for so long when they could have been making 7nm chips years ago cheaper with the DUV machines China already has instead of waiting for expensive EUV machines. All those years of lost revenue for nothing. Incompetent upper management.
It takes a while to tune the process and and to upgrade the DUV 1980i to 1980fi.
So Huawei and SMIC kept this secret from Raimondo all these years.
ASML also disinform Raimondo about its DUV capability. Tell Raimondo to ban the 2000 series but allow the upgraded 1980fi DUV to be exported.