Early iPhone 7 Teardowns: Intel & Qualcomm Modems, TSMC SoC, 2 to 3 GB of RAMby Ryan Smith on September 16, 2016 10:15 AM EST
- Posted in
- iPhone 7
- iPhone 7 Plus
Today is launch date for Apple’s new iPhone 7 models, and as is tradition every year, the teardowns have already begun. Both the Chipworks/TechInsights team and iFixit have completed their respective initial teardowns of the iPhone 7 and 7 Plus, tearing part some of the first phones to go on sale. These teardowns are preliminary – there’s a lot of work left to do in deciphering the many cryptic identification numbers of the various components – but right off the bat it confirms a few things about each of the phones.
We’ll start off with the Chipworks teardown of an iPhone 7, which they have already earnestly begun identifying chips on. One of their immediate findings is that for the first time in a while, Apple is using a non-Qualcomm modem. On Chipworks’ GSM phone, they have found an Intel baseband processor with the model number PMB9943. They believe this to be part of Intel’s XMM 7360 modem, which was announced back in 2015.
The XMM 7360 is a high-end LTE Advanced modem design that offers up to Category 10 performance (450 Mbps down). This is achieved in part through the use of 3x carrier aggregation, which allows the modem to use up to 60Mhz of wireless spectrum. The modem does not support CDMA, and as the iFixit team has turned up a Qualcomm Snapdragon X12 (Cat 12) modem in their unit, Apple is clearly using modems from multiple vendors. It’s not clear how this breakdown works – if Apple is using the Qualcomm modem in some GSM phones as well – but at a minimum the Qualcomm modem will have to be in all of the CDMA-capable models.
Meanwhile for Intel’s modem group, this is a significant win, as the company has not seen too many high-profile device wins in recent years. Though historically speaking, this is actually something of a return to form. The original iPhone used a modem from the group’s predecessor, Infineon’s wireless unit, whom Intel purchased in 2010.
Moving on, we have of course the A10 Fusion SoC. Chipworks has yet to get a die shot in, but they have already confirmed that the SoC is produced by TSMC. This is presumably another 16nm FinFET SoC, but the Chipworks team will be working to confirm that. So far there is no evidence to indicate that Apple is dual-sourcing SoCs on the iPhone 7 like they did the iPhone 6s, but this is again preliminary information.
Given that Apple doesn’t get a major new manufacturing process to use this generation, I had been wondering if and how Apple would instead compromise on die size, and we now have a rough answer. Chipworks estimates the A10 die to be roughly 125mm2 in size. This is 20.5mm2 (~20%) larger than the A9 TSMC die. The good news for Apple is that yields should be much better in 2016 than they were in 2015, so chip manufacturing costs should be down, helping to offset the higher costs of the larger chip. And while there are ways to improve performance without increasing the die size, any kind of significant improvement would have to entail a larger die, which is exactly what we’re seeing here. If nothing else, Apple would need more room for the new high-efficiency CPU cores the chip packs in.
Speaking of packing, Chipworks’ teardown also hints that the A10 may have been packaged using TSMC’s new Integrated Fan Out (InFO) technique, which is meant to allow for thinner chip packages. InFO saves space, in part, by eliminating the organic substrate that logic dies have traditionally been mounted on.
Lastly with the A10, Chipworks’ teardown of their iPhone 7 confirms that it has 2GB of RAM, specifically Samsung LPDDR4. Besides confirming that the memory capacity on the iPhone 7 hasn’t increased versus the iPhone 6s, this is notable because iFixit has found something different with their iPhone 7 Plus. In the case of the larger phone, there is 3GB of RAM. Apple has never before equipped the Plus with more memory than the base model, so this is a first. And while there has always been some performance stratification between the two phones due to the Plus model’s larger size – allowing better heat dissipation, and therefore slightly better performance – I wonder if this means we’re going to see an increase in the stratification between the two phone models. If nothing else, I suspect this comes as a consequence of the Plus’s higher resolution screen: all other factors being held equal, the Plus needs a bit more RAM for its larger GPU frame buffers.
Update: The Chipworks crew has their die shot and floor plan back, so let's take a look.
As Apple already disclosed the number of GPU clusters, there's not a whole lot left to doubt in terms of basic construction.The GPU cores, SRAM caches, and the performance CPU cores are all easy enough to find, with the latter block now about 16mm2, versus 13mm2 in the A9. The big question here is where the two smaller, high-efficiency cores are. Chipworks postulates three thories: 1) They're in the same block as the high performance cores (and hence labeled as a quad core CPU), they're to the left of the die, or they're to the bottom left of the die.
It is likely - but not guaranteed - that they're close to the high-performance cores. However both alternative locations do have pairs of identical blocks, which is what you'd be looking for in a secondary set of CPU cores. So although those options are less likely, without additional information it's difficult to rule out those options entirely.
Finally, one interesting aspect of the Chipworks report is that they unexpectedly found a third audio amplifier. Chipworks was expecting to find two – one for each of the speakers – but came up with a third. The firm believes that the third amp may be for headphones, which in turn would mean that Apple has significantly revised the Lightning port specification for the iPhone 7. Previously Lightning has only carried digital audio, which doesn’t require an amp in the phone itself. In the initial iPhone 7 announcement I had speculated that Apple put the DAC (and amp) inside their 3.5mm adapter – which would be consistent with how Lightning has worked over the last 4 years – but this casts doubt on that idea. If Apple has revised the specification to allow analog audio over the port, then this greatly simplifies how headphones and adapters will work. But it also would raise a number of questions about peripheral compatibility, especially what happens if you plug something like the Lightning EarPods into an older device like the iPhone 5s.
On that note, the Chipworks and iFixit teardowns also show us what’s gone in the place of the now-absent headphone jack: Apple has placed a taptic engine (linear actuator) for the solid state home button, and an unusual plastic bumper.
Wrapping things up, Chipworks’ reports that they already have the A10 SoC in their lab for further work, including confirming the manufacturing process and, of course, a die shot. The latter should prove to be very interesting, as it will be the first look we get at Apple’s new high-efficiency CPU cores. And in the meantime on our end we also have our iPhone samples in-house, so we’re diligently working on putting together a review for later this month. So be sure to stay tuned for that.
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Synomenon - Friday, September 16, 2016 - linkInterested to see whether the 7 and 7 Plus have the same camera sensor for the main camera. There were people posting before that the 7 had a slightly larger sensor for its camera than the 7 Plus.
Samus - Friday, September 16, 2016 - linkAlso interesting about the DAC for the lightning port. Makes me feel a little different about the whole 3.5mm jack being removed, but still kind of turned off none the less. I use square to take credit cards for my business, a digital 3.5mm thermometer when I travel, and occasionally a micro boom 3.5mm microphone when recording video of my daughter playing hockey, etc.
I guess the revised lightning port to emulate a 3.5mm jack explains why all these accessories, at least according to square and some other manufactures, continue to work even with the adapter, because the adapter isn't really emulating anything it's just bringing the signal down from the port...
thope - Friday, September 16, 2016 - linklooks like lightning port was highly programmable. just tried with 5C and audio dongle. On IOS 9 i get and error saying accessory not supported and in iOS 10 it works. I have compared the sound and it seems identical on both the jack and the adapter.
Constructor - Saturday, September 17, 2016 - linkAnd that is why it needs to contain a DAC in the adapter. It could not work with the old devices otherwise, which have always required peripheral DACs for Lightning audio.
And, wouldn't you know, Cirrus has just the exactly matching special chip for precisely this purpose, namely interfacing with Lightning on one side and headphones on the other (it's also almost certainly built into the Lightning earbuds): http://www.cirrus.com/en/applications/app/detail/A...
Constructor - Saturday, September 17, 2016 - linkSo when will anybody finally crack their Lightning adapter open to check? iFixit hasn't bothered, which is a severe omission.
londedoganet - Tuesday, September 20, 2016 - linkGood news: A Vietnamese site known for its iPhone leaks has torn one apart.
Spoiler: There's a DAC from Cirrus Logic inside the adapter, exactly as you said, because of course there was, and everyone else theorizing about secret changes to the Lightning specification was just being silly.
Constructor - Wednesday, September 21, 2016 - linkWell, at least very speculative...
But it was an interesting theory nevertheless!
thope - Monday, September 19, 2016 - linkYou are forgetting that lightning headphones always worked with iPhone 5/5c. If the adapter had a dac it would not matter if the software was iOS 9/10. I am convinced that lightning port always had the capability to send analog audio. I am sure the cable has apples authentication chip to inform the phone of what accessory is connected. Also, Given the size of the adapter it is highly unlikely that there is a dac in there. Also, there is still a cirrus headphone amp/dac present onboard. I have the audeze sine cipher cable and it has an active dac. The remote part itself is much bigger that the dongle.
Constructor - Wednesday, September 21, 2016 - linkIt just has to be a new kind of device with special driver needs even while it's similar to existing ones in order to require an iOS upgrade, and it looks as if it's just that.
HunterKlynn - Friday, September 16, 2016 - linkPhil Schiller explicitly said they're identical, so I'd be surprised if they're not.