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--=-=-= Content-Transfer-Encoding: quoted-printable Peter Clifton <pcjc2 AT cam DOT ac DOT uk> writes: > On Fri, 2014-06-27 at 15:14 -0600, Bdale Garbee wrote: > >> Real-world blind and buried vias always connect a range of layers from N >> to M. The tricky bit in my experience in large-layer-count boards was >> always when there were multiple buried vias with the same X-Y >> coordinate. In other words, something like layers 2-3 and 6-7 connected >> in an 8-layer board. > > Hmm, turns out there is such a thing as a layer1-3 skip via. Interesting, but it's hard for me to see how it's practically different From=20a layer 1-3 via with a keep-out around the via on layer 2? The question I guess is what info does the fab need to make such a structure? From a design standpoint, it seems to be mostly about allowing different annular ring diameters per layer? Bdale --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBU648xDqTYZbAldlBAQoV2A/8ClLlmq+ods1mo8tscOSzTG3ISNAQOYpg W9Z5LCCWhBZdqt30nU3qHP/+BkKnlsRoKQXqZLc1SOWQ/6ZT7G3FAykxZvX9sU3D DGsWgkl+MdhDaNBPNAmC0THIJ9z9ZuVc2NQN/OZFwzaWIrJAi83EUae5qUC1Rsbn 4mXsNE4lPlfEd70B19Qg+znxDHEPWPNsk9pb/psOsTAW4LO7UHtImLxqIQwnSF9j WY5rVbMf29lrVBlYOFsULNRDMWKdolYMAxeVQcWjeY99FcQWw+7FnmMn4YL//fXd E+K8RnvlDiS2z3c21peUIxqoZd7DIw/wX9CcKtvrZVPbv36VXRpVLY9ivXE8FuwD 6jwQzOjb3VtjGxM71eexzm3NQcf6xs2+B+d1BWJJsOitM8avfY5CKzQTq7Cpmiq1 t2R+XDNXqvrtNAKcTq4bowoVIjz5bDqiAjjMC2zFRMTxYYdHVQzhMgtkfAR2287L vpuJDrC9wJvfIpdj/A6jmyz43f+WkpkrfjneN9dUQAC+SA06wNowz6yl+RUBvq74 QkyV/+JlzV5YC/eyjifmyjbhyGVz254hicSN9LD+Hqvxa+d9ZJgywA22iplj5KC+ +xRpy/3lItdQNREQy604LKOqMjpvwiU4HsVObFr/nvQQ0viPsI26FKHpDa8Jm7Zm +IjXjYpqiUg= =CIom -----END PGP SIGNATURE----- --=-=-=--
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