JTAG: Is it still up to snuff?

摘要

Given the advancement in board-level science, and the changes in board-level test requirements; and the fact that the 1149.1 TAP is more being used for "in-chip" control than for static interconnect testing, but with inadequate sequences and bandwidth capability; and given that other standards are being developed to replace some of the missing or inadequate functionality - the question has been asked, "Is the original 1149.1 standard irrelevant, outdated, outmoded, or redundant?"