The rumors of 5S and iPad 5 have been circulated. Not too much, but it is true. It is very likely that the two machines will use A7 and A7X processors respectively. This means that unless Apple no longer designs custom chips, it chooses Intel products. This is not our assumption, but some people say it, even on Wall Street.
At the end of November last year, RBC Capital Markets analyst Doug Friedman said that if Apple's iPad is replaced by Intel's processor, Intel will OEM Apple's processor for Apple. He even suggested that Apple's own application processor was only used for a while, until there was a better chip. Now let's take a look at Apple's "A-series processors." Think about the evolution of these products, and then look at the evidence of Apple's semiconductor design, which seems to be the perfect footnote.
Before our assumptions go too far, let's consider the A6 and A6X processors. With the release of the iPhone 5 at the same time, this is exactly the rumor and conjecture of all iPhone and A series processors.
However, more than 40 days ago, the A6X that appeared with the iPad 4 was completely unexpected. It seems like a halfway to kill a bite of gold, so far has made the prophet confused.
Chipworks first released the bare crystal picture of the A6 and A6X chips, and we have an explanation below. One of the most surprising features of the two chips is that they are all self-produced. Further, it is a customized design, the layout design is tailored, rather than the general automated "place and route" approach. In the discussion about A6, ChipWorks says this:
“This design is more expensive and time consuming. However, it produces a faster maximum clock frequency and sometimes a higher chip density.â€
They also said: "In fact, in addition to Intel's CPU, this is one of the first custom digital cores we have seen in recent years."
Apple is very serious about their design capabilities and has made a lot of investment, which is beyond doubt. So, without considering the reasons for their custom design, the following assumption is very reliable: Apple will not produce chips when it is waiting for Intel processors.
In the first discussion of the A6X processor in November, Chipworks provided some comparison data for A6 and A6X. The chip area of ​​the A6X is 124 square millimeters, which is 28% larger than the A6's 96.7 square millimeters.
The CPUs of both processors account for 15 square millimeters, the A6's triple-core GPUs account for 16 square millimeters, and the A6X processors' quad-core CPUs account for 35 square millimeters.
From the above figures, it is likely that in this extra 19 square millimeters, the A6X's extra GPUs account for a large area of ​​10 square millimeters. It doesn't seem to be that much, but its actual area is larger than a single GPU area.
Based on this extra area, we would like to believe that the A6X that Chipworks calls doubles the SDRAM interface width and adds some new interface modules. They also saw that a few PLLs in the A6X accounted for a few square millimeters.
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