-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: > Andy Green wrote: >> VB_SYS has no decoupling at all on our design. > > Nice catch !
Thanks! >> This is a real problem that is going to require manual rework before >> ship, but that should be possible neatly from the VB_SYS end of the >> recently added 10K resistors for EXTON[1..3] to 0V on C1764. > > We're very lucky :-) What sucks is that VB_SYS isn't easily accessible > in any of the older designs, so reworking any pre-v5 hardware will be > fun ... Well soon there will be plenty of A5s so the old GTA02 will be deprecated. But it is a whole new ballgame debugging these kinds of boards where many chips have underside interconnect and there isn't any outer layer tracking to speak of. And laser vias :-O It was a problem since GTA02 A1 where we changed to the PCF50633... it can explain a long list of unstable PMU behaviour -- including the "turning on the GSM unit kills a lot of phones" thing, "some phones won't play with USB-only" and so on. The rework is probably going to make a headache but this is great news if we killed a bunch of pretty scary monsters all at once. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFHqCo/OjLpvpq7dMoRAiKaAKCWLCO1hiYngjHJj/e4kjdxsobw2wCfXX8c 5nrYx0HOvJT7o1DfPzosXMA= =cffF -----END PGP SIGNATURE-----
