[Arm-netbook] USB3.1 pinout

[Internet]

Hey there!

I was wondering about the USB3.1 pinout in the EOMA68 standard. In my
research on the USB Type C connector I found out that USB3.1
(Superspeed+) has only two differential signal pairs (one for receiving,
one for transmitting) but on elinux.org there are four differential
pairs for only one USB interface. Are the other two pairs meant to be
used by the second USB port or did I miss something?

Thank you very much!
Julius Lehmann


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[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

Post by Internet
Hey there!
I was wondering about the USB3.1 pinout in the EOMA68 standard. In my
research on the USB Type C connector I found out that USB3.1
(Superspeed+) has only two differential signal pairs (one for receiving,
one for transmitting)

http://pinoutguide.com/Slots/usb-type-c_pinout.shtml

two for receiving, two for transmitting, each 5gbit/s for a total of
10gb/sec. the connector and thus the pinouts are rotatable by 180
degrees so the pinouts on the first 12 pins (top row) are *identical*
layout to the second 12 pins (bottom row) except in the reverse order.
D+ and D- (the USB2 pins) are *missing* on one row of the receptacle
so that you don't connect them up twice (which would be bad).

you *may* be thinking of USB 3.0 which is connector-compatible with
USB 2.0 and is what you find on most laptops and desktop computers
these days:

http://pinoutguide.com/Slots/usb_3_0_connector_pinout.shtml

that is *only* one set of (5gbit/sec) tx-rx differential pairs.

scared me for a minute that i'd messed it up... :)

l.

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[zap]

I just wanted to say, congratulations on reaching 200k. on your campaign
funding :)

Post by Luke Kenneth Casson Leighton
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

Post by Internet
Hey there!
I was wondering about the USB3.1 pinout in the EOMA68 standard. In my
research on the USB Type C connector I found out that USB3.1
(Superspeed+) has only two differential signal pairs (one for receiving,
one for transmitting)

http://pinoutguide.com/Slots/usb-type-c_pinout.shtml
two for receiving, two for transmitting, each 5gbit/s for a total of
10gb/sec. the connector and thus the pinouts are rotatable by 180
degrees so the pinouts on the first 12 pins (top row) are *identical*
layout to the second 12 pins (bottom row) except in the reverse order.
D+ and D- (the USB2 pins) are *missing* on one row of the receptacle
so that you don't connect them up twice (which would be bad).
you *may* be thinking of USB 3.0 which is connector-compatible with
USB 2.0 and is what you find on most laptops and desktop computers
http://pinoutguide.com/Slots/usb_3_0_connector_pinout.shtml
that is *only* one set of (5gbit/sec) tx-rx differential pairs.
scared me for a minute that i'd messed it up... :)
l.
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[Luke Kenneth Casson Leighton]

Post by zap
I just wanted to say, congratulations on reaching 200k. on your campaign
funding :)

thanks :) it'll go higher in a big jump once the cards are shipping.
i would like the rk3288 ready and proven and the second campaign
underway just *before* that happens.

i worked with my friend to assemble the first passthrough prototypes
yesterday. lots more to do to finish them off prior to testing.

l.

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[zap]

Post by zap
I just wanted to say, congratulations on reaching 200k. on your campaign
funding :)
thanks :) it'll go higher in a big jump once the cards are shipping.
i would like the rk3288 ready and proven and the second campaign
underway just *before* that happens.

4gb of ram is available for the rk3288 right? if so then I don't blame
you. That will sell pretty well I bet. :)

Post by zap
i worked with my friend to assemble the first passthrough prototypes
yesterday. lots more to do to finish them off prior to testing.
l.

I am sure you will get it done easily enough. I read though from some of
the other people you are sick though...

I hope you feel better.

Post by zap
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[Allan Mwenda]

4GB RAM and 32GB storage? I'm throwing money at the screen why isn't it working?
Seriously though how much are we looking at for campaign season?

Post by zap

Post by zap
I just wanted to say, congratulations on reaching 200k. on your

campaign

Post by zap
funding :)

thanks :) it'll go higher in a big jump once the cards are shipping.
i would like the rk3288 ready and proven and the second campaign
underway just *before* that happens.
i worked with my friend to assemble the first passthrough prototypes
yesterday. lots more to do to finish them off prior to testing.
l.
_______________________________________________
http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook

[Internet]

Regarding USB C you are right that there are four differential pairs on
the connector. However, for communication only two pairs are used
because the USB 3.1 protocol only uses two. On the device that has a
USB C connector you need a dedicated controller that manages the
orientation of the plug. Then the two data lines are connected to the
right pins on the connector through a multiplexer. The other two pairs
on the connector are for no use in USB mode but if you want to use USB
C in alternate mode (e.g. DisplayPort), signals can be rerouted.
You can find all the information on usb.org (zip archive with full
specification).
This basically means that the EOMA68 standard has two differential
pairs that are not used for USB but if your intention was to make it
available for USB C, an internal multiplexer would be needed.
Kind regards
Julius Lehmann
On Feb 5, 2017, 14:20, at 14:20, Luke Kenneth Casson Leighton

Post by Internet
---

https://www.crowdsupply.com/eoma68

Post by Internet

Post by Internet
Hey there!
I was wondering about the USB3.1 pinout in the EOMA68 standard. In

my

Post by Internet

Post by Internet
research on the USB Type C connector I found out that USB3.1
(Superspeed+) has only two differential signal pairs (one for

receiving,

Post by Internet
one for transmitting)

http://pinoutguide.com/Slots/usb-type-c_pinout.shtml
two for receiving, two for transmitting, each 5gbit/s for a total of
10gb/sec. the connector and thus the pinouts are rotatable by 180
degrees so the pinouts on the first 12 pins (top row) are *identical*
layout to the second 12 pins (bottom row) except in the reverse order.
D+ and D- (the USB2 pins) are *missing* on one row of the receptacle
so that you don't connect them up twice (which would be bad).
you *may* be thinking of USB 3.0 which is connector-compatible with
USB 2.0 and is what you find on most laptops and desktop computers
http://pinoutguide.com/Slots/usb_3_0_connector_pinout.shtml
that is *only* one set of (5gbit/sec) tx-rx differential pairs.
scared me for a minute that i'd messed it up... :)
l.
_______________________________________________
http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook

[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

Regarding USB C you are right that there are four differential pairs on

the connector. However, for communication only two pairs are used because
the USB 3.1 protocol only uses two. On the device that has a USB C
connector you need a dedicated controller that manages the orientation of
the plug. Then the two data lines are connected to the right pins on the
connector through a multiplexer. The other two pairs on the connector are
for no use in USB mode but if you want to use USB C in alternate mode (e.g.
DisplayPort), signals can be rerouted.
You can find all the information on usb.org
<http://t224.mjt.lu/lnk/AEUAHWykN94AAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYl5lfeaEfW2hMTR63ZGLMHX5RrAAGAjk/1/ZviPu0ichkU-Gm4llF2oBw/aHR0cDovL3VzYi5vcmc>
(zip archive with full specification).
This basically means that the EOMA68 standard has two differential pairs
that are not used for USB but if your intention was to make it available
for USB C, an internal multiplexer would be needed.

argh! no, it was a misunderstanding. ha. very funny. it means i
accidentally made room for 4 extra wires... which could be used to upgrade
the *second* USB port to USB3.1 as well.

that's frickin hilarious.

l.

[Internet]

I'm glad to hear the standrd itself is correct. The only thing I would still like to know is the mapping of the two USB ports. So, which superspeed wires correspond to which usb 2.0 wires?

Julius Lehmann

Post by Luke Kenneth Casson Leighton
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

Regarding USB C you are right that there are four differential pairs

on

the connector. However, for communication only two pairs are used

because

the USB 3.1 protocol only uses two. On the device that has a USB C
connector you need a dedicated controller that manages the

orientation of

the plug. Then the two data lines are connected to the right pins on

the

connector through a multiplexer. The other two pairs on the

connector are

for no use in USB mode but if you want to use USB C in alternate

mode (e.g.

DisplayPort), signals can be rerouted.
You can find all the information on usb.org

<http://t224.mjt.lu/lnk/AEUAHWykN94AAAAAAAAAAGbE2wkAASHlFNUAAAAAAAZHgABYl5lfeaEfW2hMTR63ZGLMHX5RrAAGAjk/1/ZviPu0ichkU-Gm4llF2oBw/aHR0cDovL3VzYi5vcmc>

(zip archive with full specification).
This basically means that the EOMA68 standard has two differential

pairs

that are not used for USB but if your intention was to make it

available

for USB C, an internal multiplexer would be needed.

argh! no, it was a misunderstanding. ha. very funny. it means i
accidentally made room for 4 extra wires... which could be used to upgrade
the *second* USB port to USB3.1 as well.
that's frickin hilarious.
l.
------------------------------------------------------------------------
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[Luke Kenneth Casson Leighton]

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

Post by Internet
I'm glad to hear the standrd itself is correct.

it's not!!! it just doesn't affect the current cards.

Post by Internet
The only thing I would still like to know is the mapping of the two USB
ports.

me too

Post by Internet
So, which superspeed wires correspond to which usb 2.0 wires?

i'll have to revise the standard.

l.

[Nick Hardiman]

A standard that provides for two USB3.1 ports is a good thing. Isn’t it?

In fact, USB3.1 availability might be unique in this small board world. I watched a long presentation where Jon Hall said he couldn’t find one (OpenHours #32 - 96Boards discussion with Jon "maddog” Hall).

No idea what standard revision and chain of components is required to make this work, so I’ve got no idea how to help here. Sorry.

Thanks, Nick

Post by Internet
I'm glad to hear the standrd itself is correct.
it's not!!! it just doesn't affect the current cards.
The only thing I would still like to know is the mapping of the two USB ports.
me too
So, which superspeed wires correspond to which usb 2.0 wires?
i'll have to revise the standard.

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[Luke Kenneth Casson Leighton]

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On Mon, Feb 6, 2017 at 10:21 AM, Nick Hardiman

Post by Nick Hardiman
A standard that provides for two USB3.1 ports is a good thing. Isn’t it?

yeah it is :)

Post by Nick Hardiman
In fact, USB3.1 availability might be unique in this small board world.

well there first has to actually *be* a SoC that has USB 3.1!

Post by Nick Hardiman
I watched a long presentation where Jon Hall said he couldn’t find one (OpenHours #32 - 96Boards discussion with Jon "maddog” Hall).

mmm... not a fan of 96boards after their spectacular failure to
respond publicly to my questions about their incompetence in designing
the standard *without consulting anybody*

big fan of jon hall though.

Post by Nick Hardiman
No idea what standard revision and chain of components is required to make this work, so I’ve got no idea how to help here. Sorry.

it's ok i just need to make a decision and document it. it'll be
along the lines of "what would a typical SoC have as pinouts and how
can PCB track cross-overs be minimised under the circumstances".

i _should_ have placed the pins for the SStx/rx next door to each of
their respective USB2 tracks... but that's not possible, now.

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