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339S00458 is much likely WiFi/BT module.
It is BCM4375 from Broadcom. But, it should be in the WiFi/BT module made by Murata KM8D03042.
It is not PoP package(Package-on-Package) . From the photo of A12X, it should not be PoP package(processor is next to two memory chips). Is that TSMC’s InFo or CoWos package technology?
HBM can provide higher BW. But, from power consumption, most likely, it can not be. LPDDR4x can provide lower power consumption menory solution for mobile devices, such as iPad.
Qualcomm chip provides GNSS(GPS) feature. It is not necessary to use discrete chip for GPS.
Not DDR3 but LPDDR3. It is limited by intel processor which supports LPDDR3 and DDR4 only. intel processor does not support LPDDR4x.
Dialog used to provide PMIC for Apple iPhone, iPad, Apple TV and iPod. Apple processor-based system always uses Dialog’s PMIC solution. But, from iPhone XS Max, seems, Apple starts to uses its own design on PMIC just as Dialog said that before. refer to https://www.eetimes.com/document.asp?doc...
Is 338S00540 (XS Max) WiFi/Bluetooth module from Murata?
intel modem supports GNSS feature. It won’t have discrete GNSS chip in the iPhone XS.
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