Author Topic: USB3.0 real max speed is 400MB/s....  (Read 13090 times)

kbs1439

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USB3.0 real max speed is 400MB/s....
« on: July 26, 2013, 09:27:11 pm »
Hello.

I have one question..


I know that USB3.0 real max speed is 400MB/s.

How calculate the speed of 400 MB?

As far as I know, Bulk transfer of the data packet size is 1044 bytes.(DPH 16 DPP 1024 + CRC 4)

And Size is the total 12Byte framing.(DPH 4 DPP 8 )

So the size of one packet is 1056 bytes.

But 400MB/s has to be, one must have 1280 bytes per packet.

Link flow control is not calculated.  Is it because it?

So how do I calculate?



Jan Axelson

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Re: USB3.0 real max speed is 400MB/s....
« Reply #1 on: July 26, 2013, 09:53:51 pm »

Barry Twycross

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Re: USB3.0 real max speed is 400MB/s....
« Reply #2 on: July 27, 2013, 12:25:00 am »
I know that USB3.0 real max speed is 400MB/s.
The implementation I worked on had an actual measured transfer rate of over 460MB/s. (463 I seem to remember.)

kbs1439

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Re: USB3.0 real max speed is 400MB/s....
« Reply #3 on: July 27, 2013, 04:25:54 am »
Thank you for answer me.

Um. I dont know how solve 400MB in USB3.0 Spec.

But... Its all right.

Thank you . Thank you.

Jan Axelson

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Re: USB3.0 real max speed is 400MB/s....
« Reply #4 on: July 27, 2013, 09:49:07 am »
The implementation I worked on had an actual measured transfer rate of over 460MB/s. (463 I seem to remember.)

Impressive!