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AuthorTopic: iPad - PA Semi Inside?  (Read 1726 times)

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Offline bloodline

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Re: iPad - PA Semi Inside?
« Reply #15 on: April 16, 2010, 12:29:58 PM »
Quote from: Karlos;553824
I don't really get why the designers being PASemi preclude the A4 being an ARM based CPU.

Whatever hardware design principles they used in the design of their ultra low power PPC processor could equally be applied to an ARM processor, surely?
We should also remember that PASemi was actually founded by the chief architect for the StrongARM project.

But, from the SDK, it is clear the iPad is the same family of hardware (CPU and gfx cores) as the iPhone. Apple isn't psychotic enough to have a third architecture on the go.

Offline jj

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Re: iPad - PA Semi Inside?
« Reply #16 on: April 16, 2010, 12:32:04 PM »
Quote from: bloodline;553829
We should also remember that PASemi was actually founded by the chief architect for the StrongARM project.
 
But, from the SDK, it is clear the iPad is the same family of hardware (CPU and gfx cores) as the iPhone. Apple isn't psychotic enough to have a third architecture on the go.

 
Sorry all this talk of getting semi inside ( is this possible) and Strong arm :)
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Offline bloodline

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Re: iPad - PA Semi Inside?
« Reply #17 on: April 16, 2010, 12:32:04 PM »
Quote from: Karlos;553825
Indeed :)

Say, does your co-developer know about this sordid history? What's it worth to keep schtum?
Actually the game does have a sock related easter egg :) you just have to find it!

She knows my sordid past... There is no "hiding the sock" from your other half :lol:

Offline bloodline

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Re: iPad - PA Semi Inside?
« Reply #18 on: April 16, 2010, 12:33:03 PM »
Quote from: JJ;553832
Sorry all this talk of getting semi inside ( is this possible) and Strong arm :)
:lol:

Touché!

Offline Karlos

Re: iPad - PA Semi Inside?
« Reply #19 on: April 16, 2010, 12:39:01 PM »
To quote Finnbar Saunders, "yip! yip!"
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Re: iPad - PA Semi Inside?
« Reply #20 on: April 16, 2010, 12:59:35 PM »
And would your Personel Assistant approve :)
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Offline Hattig

Re: iPad - PA Semi Inside?
« Reply #21 on: April 16, 2010, 02:28:53 PM »
Quote from: Karlos;553732
It's an ARM based CPU designed by the people formerly of PASemi, which apple bought up for 278M USD a few years ago.

I don't imagine those guys would have any problem designing ARM based processors any more than they did PPC ones.


Actually the CPU is a 45nm shrink of the 65nm 3GS CPU, although it has more L2 cache. It is made by Samsung. It's probably an Intrinsity design, as Intrinsity developed the 3GS SoC for Samsung, and Apple bought them recently.

http://www.chipworks.com/A4_is_Samsung_45nm.aspx

"What we found was an APL0398 chip, presumably the next-generation processor from the APL0298 that we found in the iPhone 3GS. "

You don't replace an ARM Cortex A8 with a PowerPC core, and then redo all the internal hardware and buses to account for the different architecture, and them keep the product code virtually the same.

Also there's no evidence of an emulator.

The performance increase is perfectly explained by the faster CPU and extra L2 cache.
 

Offline persia

Re: iPad - PA Semi Inside?
« Reply #22 on: April 16, 2010, 03:17:47 PM »
Very, very sneaky indeed, they replace the whole internals with incompatible hardware and then wrote an emulator to hide the fact.  It's a conspiracy I tell you, and they're all in on it.


Quote from: Hattig;553858


You don't replace an ARM Cortex A8 with a PowerPC core, and then redo all the internal hardware and buses to account for the different architecture, and them keep the product code virtually the same.

Also there's no evidence of an emulator.

The performance increase is perfectly explained by the faster CPU and extra L2 cache.
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