The purpose of aligning ET spec is to open the gate for most of the ISI slivers to build into Drive and validate. There are two(2) ET parameters that HGA PPE proposed to do the spec alignment (to avoid 0.76% ET yield impact) so that ISI slivers won't be killed by current ET spec, as below:
align MIN_CTQ_AMP spec from 4800uV to 2000uV
align MIN_SNR spec from 16 min to 12.3 min