Breaking News
Comments
Newest First | Oldest First | Threaded View
Page 1 / 2   >   >>
krisi
User Rank
Author
Re: power savings?
krisi   7/12/2013 10:54:14 AM
NO RATINGS
Every CMOS design has different transistor sizes (W and L)...what I thought you mean by your comment was that minimum channel length in both cores is different, and that surprised me

Warren3
User Rank
Author
Re: power savings?
Warren3   7/11/2013 7:47:29 PM
NO RATINGS
Nope. Transistors designed to be high performance tend to be large and leaky while those designed for low power tend towards low capacitance (small self-size, small distances and gates to drive) and lowest possible leakage. 

krisi
User Rank
Author
Re: power savings?
krisi   7/8/2013 12:26:13 PM
NO RATINGS
different transistor sizes for both cores??? why? it is not like one is analog and the other digital

Sheetal.Pandey
User Rank
Author
Re: power savings?
Sheetal.Pandey   7/8/2013 6:59:06 AM
NO RATINGS
Its great to see Fujitsu is bringing something interesting on the table. Performance and power has been always contesting factors in chip development.

Warren3
User Rank
Author
Re: power savings?
Warren3   7/7/2013 11:57:37 PM
NO RATINGS
[Responding to Krisi 7/3 6:00 posting] Transistor sizing choices and flop staging choices would suggest not mixing the cores together. Maybe even regionalized process applications could be made? Merging of cores [also] feels like it goes counter to SOC design phylosophy generally.

krisi
User Rank
Author
Re: power savings?
krisi   7/4/2013 11:57:21 AM
NO RATINGS
thank you Max...I have the same impression, for this to make sense both processors have to be integrated on one die...otherwise chip to chip IO communications will negate most of the gains...Kris

Max The Magnificent
User Rank
Author
Re: power savings?
Max The Magnificent   7/4/2013 11:38:33 AM
NO RATINGS
@krisi: why not integrate the two dice into one big+ device?

I may be wrong, but I thought the idea was to build an SoC using the two Big-Little processors on the same die -- I don't recall hearing about them being presented on seperate dice.

krisi
User Rank
Author
Re: power savings?
krisi   7/4/2013 9:59:13 AM
NO RATINGS
thank you Olaf...that makes sense

Peter Clarke
User Rank
Author
Re: power savings?
Peter Clarke   7/4/2013 6:30:43 AM
NO RATINGS
Yes

This only applies to the SoC.

What is being compared is a Cortex-A15 core against a big-little combination of Cortex-A15-plus-Cortex A7. Or more likely four Cortex-A15s against a 4 plus 4 design.

The A15 provides high single-thread performance but burns a lot more power while the A7 is optimized for power consumption but only achieves about one third of the peak performance at about one quarter of the power consumption.

According to information shown to me by ARM: when working on a mix of Bbench web browsing benchmark plus mp3 audio streaming on a 4+4 system, big-little saves about 50 percent of the energy compared with four Cortex-A15s at the same performance level.

Where a low-level load such as MP3 playback alone does not need to wake up the Cortex-A15 at all, the energy used can be one quarter of that on an A15, In other words a big-little energy saving of 75 percent.

 

 

 

 

 

 

 

 

 

 

Olaf Barheine
User Rank
Author
Re: power savings?
Olaf Barheine   7/4/2013 2:47:20 AM
NO RATINGS
I believe with 70% they mean only the power consumption of their micro-controller. But for example in a tablet computer for industrial applications the display and other parts like SSDs or WLAN controllers need the most electric power. In other words: It is just marketing.

Page 1 / 2   >   >>


Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Radio
LATEST ARCHIVED BROADCAST

What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.

Brought to you by:

Like Us on Facebook
Special Video Section
The LTC2380-24 is a versatile 24-bit SAR ADC that combines ...
In this short video we show an LED light demo to ...
02:46
Wireless Power enables applications where it is difficult ...
07:41
LEDs are being used in current luxury model automotive ...
With design sizes expected to increase by 5X through 2020, ...
01:48
Linear Technology’s LT8330 and LT8331, two Low Quiescent ...
The quality and reliability of Mill-Max's two-piece ...
LED lighting is an important feature in today’s and future ...
05:27
The LT8602 has two high voltage buck regulators with an ...
05:18
Silego Technology’s highly versatile Mixed-signal GreenPAK ...
The quality and reliability of Mill-Max's two-piece ...
01:34
Why the multicopter? It has every thing in it. 58 of ...
Security is important in all parts of the IoT chain, ...
Infineon explains their philosophy and why the multicopter ...
The LTC4282 Hot SwapTM controller allows a board to be ...
This video highlights the Zynq® UltraScale+™ MPSoC, and sho...
Homeowners may soon be able to store the energy generated ...
The LTC®6363 is a low power, low noise, fully differential ...
See the Virtex® UltraScale+™ FPGA with 32.75G backplane ...
Vincent Ching, applications engineer at Avago Technologies, ...