Inside Apple's iPad 2 A5: fast LPDDR2 RAM, costs 66% more than Tegra 2 - 未名空间MITBBS历史存档

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Inside Apple's iPad 2 A5: fast LPDDR2 RAM, costs 66% more than Tegra 2

Inside Apple's iPad 2 A5: fast LPDDR2 RAM, costs 66% more than Tegra 2# Apple - 家有苹果

l*a2011-03-14 07:03

1 楼

老公J1，准备申请J1豁免。
我J2，打算马上回国。
请教：
1. 我回国前还是回国后老公申请J1豁免合适？还是没有影响？
2. 如果我要再次来美国，而那时候老公J1豁免已获批，我是否可以申请B签证来美国？

e*o2011-03-14 07:03

2 楼

4天前提交的申请. 第二天信用卡就扣钱了. 但是到现在都没有收到确认信. 请问一下
这种情况正常吗?谢谢.

r*y2011-03-14 07:03

3 楼

http://www.appleinsider.com/articles/11/03/13/inside_apples_ipa
_than_tegra_2.html
The new A5 processor used by iPad 2 incorporates Samsung's new 46nm Low
Power DDR2 memory, uses a
variable clock speed and costs about $25, a significant premium over NVIDIA'
s competing Tegra 2.
According to research performed by UBM TechInsights, Apple's larger A5 (12.
1mmx10.1mm, compared to
the 7.3mmx7.3mm A4) costs about $25 to build, making it $10 more expensive
than similar dual core
chips such as the Tegra 2 used by the Motorola Xoom.
Even so, the firm estimates the iPad 2 total Bill Of Materials costs about $
270, compared to its BOM
estimate of the Xoom, which weighs in at $288 (both numbers compare 32GB 3G
versions).
Cheaper by the million dozen
"To help with their margins," UBM engineer and technical marketing manager
Allan Yogasingam told
AppleInsider, "this basically guarantees the A5 will be in most next
generation Apple products like the
iPhone 5 and the iPod Touch. It will help bring the costs down to the $15
range of their competition -
especially if they have a plan in place to ramp up production through
another fab like TSMC."
Yogasingam noted that despite rumors that Apple may be working with TSMC to
build A5 chips, "the A5 in
our possession is definitely manufactured by Samsung using their 45nm
process."
"Our first inclination that this could be a Samsung manufactured processor
was the similarity in word mark
between this font and the font in the Apple A4," the Yogasingam stated (
below, A4 wordmark is in the inset
image.)
The A5 up close, really close
UBM TechInsights also said it "used optical die and SEM cross-section images
to analyze features such as
die edge seal, metal 1 pitch, logic and SRAM transistor gate measurements.
These features were then
compared to other manufacturers in our database, including other Samsung
45nm parts," indicating that
the A5, like the previous generation Apple A4 processor, was built using
Samsung’s 45nm process.
Yogasingam provided a full scale die photo of the Apple A5 Processor (above)
. A side view image of the A5
processor reveals the package-on-package of the processor and low-power DDR2
DRAM (below).
A SEM (Scanning Electron Microscopy) cross-section image showing the SRAM
transistors in the Apple A5
processor (below).
Evolution of Apple's APL chips
Apple has used a series of Applications Processors in its iPhone, iPod touch
and iPad models since 2007.
Initial versions of the chips were designated as 8900B series, while later
versions were labeled in an APL
series. Only last year did Apple begin naming its processor as "the A4," a
step similar to the company's
previous branding of third, fourth, and fifth generations of PowerPC chips
the G3, G4 and G5.
In addition to much faster graphics based on the dual core SGX543MP2
graphics technology licensed from
Imagination Technologies, the A5 also boasts dual processing cores based on
ARM Cortex A9, with a
dynamically set clock speed.
Dynamic clock, faster RAM
"While the A4 clock speed was steady at 1 GHz," Yogasingam said, "the A5
clock speed varies depending on
the application being run. This would indicate an advanced power management
circuitry controlling the
clock speeds of the cores—something new for the A5 and may explain the use
of a different power
management IC from Dialog Semiconductor."
Also notable in the A5 is the use of fast new Low Power DDR2 DRAM memory. "
What is also interesting is
that teardowns performed at two UBM TechInsights locations (in Austin and
Ottawa) revealed two different
LPDDR2 DRAM from two different manufacturers (Samsung and Elpida). The
Samsung K4P2G324EC LPDDR2
die is the first time we’ve seen Samsung’s new 46nm LPDDR2 memory. This
also tells us that Apple is fully
prepared to package multiple LPDDR2 offerings."

j*g2011-03-14 07:03

4 楼

你什么时候回国对你老公的豁免没有影响。
你当然可以申请B签证来美国

z*r2011-03-14 07:03

5 楼

我前些天也是，而且MyCIC帐号显示的我的online application的状态是in progress.
所以我就又提交了一次申请，并且又交了一次申请费，比较背吧～。
你可以先查下你申请的状态。也可以发信 C********************[email protected] 问问你
的申请，再决定要不要重新提交。

【在 e******o 的大作中提到】

: 4天前提交的申请. 第二天信用卡就扣钱了. 但是到现在都没有收到确认信. 请问一下
: 这种情况正常吗?谢谢.

e*o2011-03-14 07:03

6 楼

谢谢回复.
我查了一下, 我的申请显示在Completed那一栏下面, 有一个V开头加9为数字的App #.
这算是成功提交了还是没有啊?

.

【在 z**********r 的大作中提到】

: 我前些天也是，而且MyCIC帐号显示的我的online application的状态是in progress.
: 所以我就又提交了一次申请，并且又交了一次申请费，比较背吧～。
: 你可以先查下你申请的状态。也可以发信 C********************[email protected] 问问你
: 的申请，再决定要不要重新提交。

z*r2011-03-14 07:03

7 楼

应该是提交了吧。
不行的话，你可以发邮件问问，附上你说的那个App #

.

【在 e******o 的大作中提到】

: 谢谢回复.
: 我查了一下, 我的申请显示在Completed那一栏下面, 有一个V开头加9为数字的App #.
: 这算是成功提交了还是没有啊?
:
: .