PORTS Forum

Ports and Interfaces => USB => Topic started by: kbs1439 on July 26, 2013, 09:27:11 pm

Title: USB3.0 real max speed is 400MB/s....
Post by: kbs1439 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?

Title: Re: USB3.0 real max speed is 400MB/s....
Post by: Jan Axelson on July 26, 2013, 09:53:51 pm

Here is one explanation:

http://www.tomshardware.com/reviews/usb-3-uas-turbo,3215-2.html

Title: Re: USB3.0 real max speed is 400MB/s....
Post by: Barry Twycross on July 27, 2013, 12:25:00 am

Quote from: kbs1439 on July 26, 2013, 09:27:11 pm

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.)

Title: Re: USB3.0 real max speed is 400MB/s....
Post by: kbs1439 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.

Title: Re: USB3.0 real max speed is 400MB/s....
Post by: Jan Axelson on July 27, 2013, 09:49:07 am

Quote from: Barry Twycross on July 27, 2013, 12:25:00 am

The implementation I worked on had an actual measured transfer rate of over 460MB/s. (463 I seem to remember.)

Impressive!