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Author Topic: Max Full Speed Control EP Polling Rate?  (Read 13074 times)

USBVIDPID

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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
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Barry Twycross

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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 »
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