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 Moderated by: jk, Page:    1  2  3  Next Page Last Page  
Adapter SD card to XQD slot.  Rate Topic 
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Posted: Tue Aug 28th, 2018 17:45 $report_button
   
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jk



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I am sure it must be possible to build an SD card to XQD slot alternative so we can use our XQD card slot cameras with regular SD cards.



SD card pinout.

Attachment: 9192FBC1-1D19-419F-91E2-2C5473801754.png (Downloaded 30 times)



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Posted: Tue Aug 28th, 2018 17:46 $report_button
   
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jk



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XQD card pinout.

XQD card is a memory card format primarily developed for flash memory cards. It uses PCI Express as a data transfer interface.

At 7 September 2016, the CFA announced the successor of XQD, CFexpress. This new standard uses the same form-factor and interface but uses the NVMe protocol for higher speeds, lower latencies and lower power consumption.

This url has a lot of information.
http://pinouts.ru/Slots/pci_express_pinout.shtml

PCI-E is a serial bus which uses two low-voltage differential LVDS pairs, at 2.5Gb/s in each direction [one transmit, and one receive pair]. PCI Express supports 1x [2.5Gbps], 2x, 4x, 8x, 12x, 16x, and 32x bus widths [transmit / receive pairs].

The differential pins [Lanes] listed in the pin out table above are LVDS which stands for: Low Voltage Differential Signaling.

PCI-Express 1x Connector Pin-Out


Pin
Side B Connector

Side A Connector

# Name Description Name Description
1 +12v +12 volt power PRSNT#1 Hot plug presence detect
2 +12v +12 volt power +12v +12 volt power
3 +12v +12 volt power +12v +12 volt power
4 GND Ground GND Ground
5 SMCLK SMBus clock JTAG2 TCK
6 SMDAT SMBus data JTAG3 TDI
7 GND Ground JTAG4 TDO
8 +3.3v +3.3 volt power JTAG5 TMS
9 JTAG1 +TRST# +3.3v +3.3 volt power
10 3.3Vaux 3.3v volt power +3.3v +3.3 volt power
11 WAKE# Link Reactivation PWRGD Power Good
Mechanical Key

12 RSVD Reserved GND Ground
13 GND Ground REFCLK+ Reference Clock
Differential pair
14 HSOp(0) Transmitter Lane 0,
Differential pair REFCLK-
15 HSOn(0) GND Ground
16 GND Ground HSIp(0) Receiver Lane 0,
Differential pair
17 PRSNT#2 Hotplug detect HSIn(0)
18 GND Ground GND Ground


Attachment: 64EEDC30-3FF9-41A2-93FE-D6A99E89F022.jpeg (Downloaded 21 times)



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Posted: Tue Aug 28th, 2018 18:03 $report_button
   
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My electronics knowledge is not good enough to know how difficult it is to build an adapter interface to allow SD cards in an XQD slot.
I am sure it must be possible.



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Posted: Tue Aug 28th, 2018 18:15 $report_button
   
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Looking at this I wonder if this is the beast.

https://www.ebay.co.uk/itm/SD-SDHC-TF-MMC-Memory-Card-to-laptop-Mini-PCI-e-reader-adapter-as-SSD/253228525382?hash=item3af598a746:g:TRwAAOSwUwFZ8rDU

I will need to compare the pinouts of an XQD card and this card.



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Posted: Tue Aug 28th, 2018 18:19 $report_button
   
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I am sure it must be possible to build an SD card to XQD slot alternative so we can use our XQD card slot cameras with regular SD cards.



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Posted: Wed Aug 29th, 2018 02:52 $report_button
   
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Reposted from Mirrorless camera thread.

My understanding is SD and XQD are fundamentally different types of data transmission protocols.

I don't believe that are simply the same thing with different physical interfaces.

From what I can gather the XQD cards use a variation of PCIe, where SD cards use a variation of SATA and CF cards are an implementation of ATA (IDE) protocols. PCIe data transmission is very much faster than SATA and is used to directly access the CPU with bulk data without the intervention of controllers. An example being M2 drives which can transmit data at extremely high data rates like ~2000MB/sec directly to the PCIe bus. The XQD cards may be a variation of the M2 storage in a different form, in which case they are the future.

My (simplistic) understanding is the SD card system in a camera includes a controller to assemble the bit groups into an orderly, managed procession of data. The XQD communication is MUCH simpler and just dumps the raw data from the camera on the host (computer) and lets the potentially more powerful host sort things out to create the appropriate final storage device protocol.

An 'adaptor' would not just be physical, it would need powerful and sophisticated circuitry to control and order the data output to the SD card. This task is normally carried out by an SD card equipped camera.

The underlying reliability and speed of the XQD card would seem to me to rely on relieving the camera from detailed data control tasks, which speeds things up, saves power and is more efficient, tasking the receiving host (computer) to order, control and assemble the data for storage. A task which it's obviously much better equipped, having powerful processors and controllers. It seems this is how the XQD card saves time and can absorb data much quicker because less processing takes place at this stage because it's at PCIe bus level, direct processor, unrefined data.

http://www.dvxuser.com/V6/archive/index.php/t-328503.html

'AtticusLake' seems to know what he (she?) is talking about.



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Posted: Wed Aug 29th, 2018 03:01 $report_button
   
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jk wrote:
Looking at this I wonder if this is the beast.

https://www.ebay.co.uk/itm/SD-SDHC-TF-MMC-Memory-Card-to-laptop-Mini-PCI-e-reader-adapter-as-SSD/253228525382?hash=item3af598a746:g:TRwAAOSwUwFZ8rDU

I will need to compare the pinouts of an XQD card and this card.

That appears to be an adaptor from the M2 PCIe interface to allow an SD card to act as the data storage medium.

There are different M2 keys, I am not yet clear what the differences are, I suspect they are voltage related.

To be honest I haven't absorbed the content of this thread yet since I have just researched and written up the above post for the previous entry in the mirrorless thread.



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Posted: Wed Aug 29th, 2018 03:26 $report_button
   
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Thanks Robert that is a really useful post. Always good to find out new technology stuff.



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Posted: Wed Aug 29th, 2018 03:40 $report_button
   
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While I can see and sympathise with your aims, an indignant response to being forced to adopt a storage medium which is far better than you feel you need, I really don't see the proposal working in practice.

It isn't just about speed, an XQD camera has been relieved of the hardware and firmware which ordered the data into a form the SD (or CF) card could store. This speeds up the storage process and saves energy, reduces battery consumption.

The move to PCIe storage is becoming universal, speed and reduced energy consumption are the result. How often do you use a spinning CF card? LOL Economy of scale will eventually come into play once everybody adopts the new medium.

I am now running my Mac Pro on PCIe cards with directly mounted SSDs and the difference is amazing. Eventually I will move onto an M2 for the OS. I have tried one but it's been flashed for PC format and refused to be flashed back to Mac. I am seeing speeds of well over 1000MB/sec, even my external striped RAID G-drive was passing 400+MB/sec yesterday. PCIe SSD booting from chime to signing in is a mere 23 seconds. SATA SSD booting was over a minute. With spinning drive it was ... go have a cuppa! LOL



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Posted: Wed Aug 29th, 2018 04:52 $report_button
   
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Just finished reading the link you posted and been considering the technical reading around.

XQD it is! I just need to accept the change as being a longer term improvement.
Same thing happened with CF to SD. Just do it.
If you can afford the camera then you need to afford the media. I already have D850, D500 that use XQD so Z7 is just one more.



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