Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
Page 1 / 3   >   >>
Noko0
User Rank
Author
Fingerprint data storage
Noko0   10/5/2013 10:08:53 AM
Fully in line...look for NVM not for SRAM. so rather look into M7 (which has both large quantity of embedded flash, and encryption capability). PS: it would be worth to have floor plan analysis of M7 as well, and get evaluation of technology used and embedded flash size.

jamescpwang
User Rank
Author
Re: The 3MB SRAM may be an image data buffer for GPUs
jamescpwang   10/2/2013 10:45:31 PM
Apple and tsmc rescue Apple iPhone 5S fingerprint identification chip.

The article was published in DigiTimes on August 12, 2013 in Chinese and the partial abstract is translated in English and listed below for your reference:

1)      Fingerprint ID chip production was not ready until July, 2013 by assembly issues in Xintec. The original mass production schedule of the ID chip was in May, 2013.

2)      Apple sent technical people to Taiwan and work with tsmc engineers to solve assembly and test issues in Xintec (wholly own OSAT by tsmc).

3)      Apple iPhone 5S fingerprint ID chip gets 30,000 8" wafer per month capacity from tsmc.

4)      The schedule delay may be related to a) the incompatibility between IOS7 software and ID chip hardware; b) ID chip is interfered by Sapphire blue paint and c) the new assembly methodology that results in very low yield.

5)      Both Apple and tsmc have confidence that the low yield problem will be solved and the mass production will be started by the end of August.

This may imply that the 3MB SRAM is not for storing fingerprint data and the separated fingerprint ID chip may have EEPROM on 8" wafer.

rick merritt
User Rank
Author
Re: The 3MB SRAM may be an image data buffer for GPUs
rick merritt   10/1/2013 3:44:20 PM
One engineer with a background at mobile SpoC companies told me today its closer to a 4 Mbyte block than 3MB. He also said he believes its a L3 cache.

wave.forest
User Rank
Author
The 3MB SRAM may be an image data buffer for GPUs
wave.forest   10/1/2013 7:57:02 AM
It may not be the GPU cache since to support cache mechanism, a cache controller is needed. This big SRAM may be an image buffer, say, to be used as ping-pong buffer, to process HD videos.

In addition, I agree it doesn't look like an L3 - not only too far away from CPU, but also no controller connected.

rick merritt
User Rank
Author
Re: Fingerprint data storage
rick merritt   9/30/2013 8:13:47 PM
Agreed, this ~3 MByte block is probably a GPU cache

Frank Eory
User Rank
Author
Re: Fingerprint data storage
Frank Eory   9/30/2013 4:01:12 PM
Bastian, that -- GPU cache -- is the most logical argument yet.

Bastian.Schick
User Rank
Author
Re: Large on-chip RAM
Bastian.Schick   9/30/2013 3:53:39 PM
They do not store the fingerprint itself. Rather they store a hash value which is smaller than the actual scan data.

Bastian.Schick
User Rank
Author
Re: Fingerprint data storage
Bastian.Schick   9/30/2013 3:50:44 PM
I have to say, that I doubt it is 3rd level cache. For one, it is to far away from the 2nd level cache. Second (correct me if I am wrong), I never saw an ARM architecture with 3rd level cache.

Also, I doubt it is GPU framebuffer, as it is far to small.But I think it is a GPU cache. It is directly between the GPU-SDRAM interface and the GPU..

rick merritt
User Rank
Author
Re: Fingerprint data storage
rick merritt   9/30/2013 12:14:23 AM
I'm guessing the 3MByte is L3 cache or perhaps a private frame buffer memory for the quad core GPU.

wilber_xbox
User Rank
Author
Re: Fingerprint data storage
wilber_xbox   9/29/2013 1:00:15 PM
Apple patented the fingerdata verification techinique for mobiles in very recently infact in 2012 they filed for the patent. I do not know where they store this information but 3MB looks rather too much for just few fingerprint.

Page 1 / 3   >   >>


Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

ESC Boston 2015 Sneak Peek! Embedded Systems That Glow in the Dark
Max Maxfield
Post a comment
Some time ago, I asked my mom what she knew about radiation. She replied that she didn't know much about it at all; all she did know was that she didn't want to be in the same room as ...

Chris Wiltz, Managing Editor, Design News

10 Greatest Hoaxes in the History of Engineering
Chris Wiltz, Managing Editor, Design News
4 comments
You'll probably be reading your fair share of fake headlines on April 1, but phony tech news - both for scams and humor - aren't anything new. The history of science and technology is rife ...

Bernard Cole

A Book For All Reasons
Bernard Cole
3 comments
Robert Oshana's recent book "Software Engineering for Embedded Systems (Newnes/Elsevier)," written and edited with Mark Kraeling, is a 'book for all reasons.' At almost 1,200 pages, it ...

latest comment mjlinden Thanks for your input!
Martin Rowe

Leonard Nimoy, We'll Miss you
Martin Rowe
5 comments
Like many of you, I was saddened to hear the news of Leonard Nimoy's death. His Star Trek character Mr. Spock was an inspiration to many of us who entered technical fields.

Special Video Section
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Radio
LATEST ARCHIVED BROADCAST
EE Times Senior Technical Editor Martin Rowe will interview EMC engineer Kenneth Wyatt.
Flash Poll