« previous next »
Pages: [1]

Author Topic: Max Full Speed Control EP Polling Rate?  (Read 13076 times)

USBVIDPID

  • Member
  • ***
  • Posts: 24
Max Full Speed Control EP Polling Rate?
« on: August 22, 2012, 03:40:22 pm »
What is the maximum polling rate allowed for a full speed control endpoint using EHCI Host?

Thx, jmw
Logged

Barry Twycross

  • Frequent Contributor
  • ****
  • Posts: 263
Re: Max Full Speed Control EP Polling Rate?
« Reply #1 on: August 22, 2012, 05:27:13 pm »
I just noticed you said control endpoint. You could possibly do it several times a ms. Table 5.2 of the spec tells you the maximum number of control requests you could possibly do depends on the transfer size, but is 32 for 1 byte transfers.

I'm not sure a real world EHCI controller could manage that though.
« Last Edit: August 22, 2012, 05:31:22 pm by Barry Twycross »
Logged
Pages: [1]
« previous next »