if we look on the memory benchmark the bus have to be more than 20. or iam wrong?
we can look at it and use octokoppler with this tools the hardware of the cam isn´t in danger.the 550d supports sdxc.the only true question is how fast is the busspeed 25 or 50..
I've managed to find a couple of pics which I've been looking at:
http://www.hansonphotodesign.com/canon-550d-repair/hB61A13E#h1dfa5a1e <-- a 550D tear-down
http://www.ebay.com/itm/SD-BOARD-PCB-ASSY-FOR-CANON-EOS-550D-REBEL-T2i-NEW-/121119790044?pt=Digital_Camera_Accessories&hash=item1c334d53dc <-- ebay link to sd controller for 550D
i personely can't read this out but i have a friend who maybe can... i write him and send him the benchmarks.iam waiting on his answer.
iam reading about sd host controllers...those this can be operation in many modes.so if the mode is set to sdxc highspeed the limit of the controller is 25mb/s thats theis the case on 550d i think.but there are to more modes one up to 50mb/s and one up to 105mb/s for the sdxc standard...
Good luck chasing the unicorn ;)
Good luck chasing the unicorn ;)Not to mention you can kiss any remainder of a warranty you have buh-bye
Not to mention you can kiss any remainder of a warranty you have buh-bye
Would it help to pull apart the camera and take detailed photos of the chips? And write down the numbers?
550D
Magic Lantern has a spec sheet for the stereo CODEC and it looks like it has some impressive stuff in it http://wiki.magiclantern.fm/_media/ak4646.pdf |
600D detail photos: http://g3gg0.de/gallery/600D_closeup/
btw - i want a datasheet of this device.
anyone who can find out more about this device?
its not listed anywhere, just some internal lifetime lists from Analog Devices accessible from the web.
it seems its a custom chip, not disclosed anywhere. :((
i expect this to be the ADTG with a lot of CMOS readout timings and AD converter integrated.
(https://www.magiclantern.fm/forum/proxy.php?request=http%3A%2F%2Fg3gg0.de%2Fgallery%2F600D_closeup%2Fpicfolio%2Fmidnails%2FIMG_3825_corr.jpg&hash=3d80dcbbb8d3893f2fd5f63accc3dc02)
600D detail photos: http://g3gg0.de/gallery/600D_closeup/
btw - i want a datasheet of this device.
anyone who can find out more about this device?
its not listed anywhere, just some internal lifetime lists from Analog Devices accessible from the web.
it seems its a custom chip, not disclosed anywhere. :((
i expect this to be the ADTG with a lot of CMOS readout timings and AD converter integrated.
(https://www.magiclantern.fm/forum/proxy.php?request=http%3A%2F%2Fg3gg0.de%2Fgallery%2F600D_closeup%2Fpicfolio%2Fmidnails%2FIMG_3825_corr.jpg&hash=3d80dcbbb8d3893f2fd5f63accc3dc02)
Has anyone thought about using the USB port in camera to hook up to an external SSD?You cannot use usb because it is too slow
You would certainly need separate power for the drive, and an SSD that would provide sufficient write speed is affordable, but would it be possible to direct the camera to write to the hard drive through the USB interface rather than the SD card?
Is this issue dead? I hope we can find a way...
Not sure what you mean by is the issue dead, it will always be an issue.
There is just no electrical hardware engineers to spend their time on it,
That's if it is even possible.
You cannot use usb because it is too slow
I could have sworn there was mention somewhere here of the theoretical possibility of the camera's USB interface reaching UHS-1 speeds...
Also - "USB 2.0: Released in April 2000. Added higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s)" - too slow? Unless of course the camera's interface is made to be incapable of such speeds.
And maybe, just maybe - http://en.wikipedia.org/wiki/USB_On-The-Go
Yes, it requires changing the file format.
The same trick can be used on 5D3 (recording on CF and SD at the same time, with a 20MB/s theoretical speed boost).
I feel like we should get a kickstarter started for donations towards a 6D for the testing to be done on.I'm guessing you own the 6D as to mention it. The way to help would be to tear it apart, which I am sure nobody is willing to do to their cameras.
Is this anything like a possibility? ;D
And is there anything I can do to be helpful?
See above!!
Actually, I was referring to the notion of using the USB interface as a supplement to the SD...should have been more specific, sorry.
Catching the Unicorn
1) there is probably a bandwidth bottleneck....as in data can only be SENT so fast to the SD card slot/port anyway
2) LiveRam....imagine a stick of DDR3 ram, powered by a battery, aka liveram
3) Create a high speed data cable that terminates in the shape of an SD card ( with appropriate protocol and ID )
In theory data could be sucked out of the camera at several Gigabytes (not bits) a second.
Perhaps a simpler way is to RAID up 2,3,or 4 SD cards....have them suck out the data alternately in parallel
List of device bit rates
http://en.wikipedia.org/wiki/List_of_device_bit_rates
LiveRam is the ultimate bandwidth solution. It would be like a class 10,000 SD card :-p
Point of interest, i actually bought a 100mbs class 10 U1 SDHC card before i decided what camera to get, there are faster cards than that. A fast card you buy today would solve many speed issues. Very high frame rate video still going to be an issue though if its also at high resolution.Have you actually read any of this post. You could have a kabillion MB/s card and it won't help, there's a bottle neck in the SD controller in the camera that limits it to 20MB/s
Q what kind of speeds are needed, reliable and burst speeds ?...solve one bottle neck and you quickly find the next !If it is found how to overcome the sd card controller bottle neck then the next bottleneck would be the SD card. Speeds that are needed at 100MB/s, whatever the fastest SD speed there is to come along.
Fast SD cards will help, but we are only talking by a few % if the bottleneck is further upstream and if the SD card is already twice the speedA card that can manage 40MB/s write speed won't be any faster than a card that can manage 30MB/s, the bottleneck is 21MB/s.
With video becoming a must have feature, or at least a top selling point this will drive the need for much faster processors and bandwidth pipelines. Its a bit like how computer games drove the development of graphics and sound cards.
Talking of bandwidth i actually crashed my computer yesterday BSOD trying to play a 4k video taken by a Smart phone.
Things are moving fast, give it another 5 years and most of the video related kinks will be ironed out....bit frustrating but i guess thats just the way it is. Solving 'Video' is an order of magnitude more difficult than solving Still pics. Start saving the pennies i guess.