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Message
From: pranav_c_java@y...<pranav_c_java@y...>
Date: Mon Aug 16 09:09:39 CEST 2004
Subject: [usb] timeout
hisorry,I made a mistake. The delay specified to each is 7.5 bit times, hence a total of 15bit
times, plus a delay of 2 bit times give a total of 17 bit times, Hence
there is a delay of not more than 18bit times was specified.
Hence the specification is 7.5 bit times only and this will reflect the
same for the High speed.
The SEO to J transistion is for EOP and not for resetting, but i couldnot
properly connect your question with the SE0 to J tansistion.
pranav
----- Original Message -----
From: rtl2gds@S...<rtl2gds@S...>
To:
Date: Tue Jun 29 22:58:14 CEST 2004
Subject: [usb] timeout
> Hi,
>
> I would like to ask about timeout values in usb 2.0 core, why these
> are
> 622 ns FS(7.5b times) and 400 ns HS (192b times)?
> Shouldn't these be 18 bit times in FS and 816 bit times in HS as
> stated
> in 7.1.18 of usb spec (end to end delay)?
> And how timeout is checked? Is timeout counter started when
> linestate
> enters squelch level (or SE0 to J transition for FS) and reset when
> linestate leaves squelch (or J to K transition for FS), when device
> waits
> for data or response from usb host)?
>
>
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