PORTS Forum

Ports and Interfaces => USB => Topic started by: chrisUSB on July 12, 2010, 09:54:54 am

Title: Maximum Guaranteed Packets / Interval (USB complete 4th)
Post by: chrisUSB on July 12, 2010, 09:54:54 am

Hallo,
i read in the USB complete book on p.77 about the maximum guaranteed packets /interval.
I do not get the table. How is the second column to be recognized?
I mean the data packet size in high speed.
First row 1-1024,second row 513-1024,third row 683-1024. How could i find out the real value for example for packetsize 700?

Regards,
Chris

EDIT:btw, thanks for the great book that really helps me a lot developing applications for USB

Title: Re: Maximum Guaranteed Packets / Interval (USB complete 4th)
Post by: Jan Axelson on July 12, 2010, 10:17:32 am

wMaxPacketSize in the endpoint descriptor specifies a value in the range. The three high-speed rows indicate valid values for endpoints that request 1, 2, or 3 packets/microframe.

I'm glad to hear you've found USB Complete useful!

Jan