Re: Low-cost low-pin count MCU with USB Host support

From	rickman <gnuarm@gmail.com>
Newsgroups	comp.arch.embedded
Subject	Re: Low-cost low-pin count MCU with USB Host support
Date	2016-06-15 10:48 -0400
Organization	A noiseless patient Spider
Message-ID	<njrps0$3dk$1@dont-email.me> (permalink)
References	(3 earlier) <nj74c6$o32$1@dont-email.me> <njoqeb$g1t$1@news.mixmin.net> <njph9a$r9p$1@dont-email.me> <njporh$p0j$2@dont-email.me> <a0336e64-0c9e-4c01-a439-912a240fd4b8@googlegroups.com>

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On 6/15/2016 7:19 AM, raimond.dragomir@gmail.com wrote:
> marți, 14 iunie 2016, 23:19:02 UTC+3, rickman a scris:
>> On 6/14/2016 2:09 PM, Simon Clubley wrote:
>>> On 2016-06-14, Espo <spam@spam.com> wrote:
>>>> Xmega is interesting too, and cheaper than SAM.
>>>> 8 bit CPU, but rich and powerful peripherals.  I've been using it
>>>>  recently and it's quite nice.
>>>>
>>>> By the way, just a quick warning: "Full speed" USB2.0 is not
>>>>  actually full speed but only 12Mbps.  I got caught out by this at
>>>>  first.
>>>
>>> Yes, that can be confusing if you are not used to the fact the USB
>>> standards group redefined the meaning of the word "full" in the
>>> presence of 480Mbps USB. When the latter came along they called it
>>> high speed USB and kept the full speed description for 12Mbps USB.
>>>
>>> I remember comments at the time saying people would find it confusing.
>>
>> Yeah, I found it confusing.  But it is a name and names are not always
>> descriptive.  It would have been more confusing if they called 480 Mbps
>> "full" speed.  I suppose they could have given it some other name like
>> "not quite full speed" or "a bit less than full speed".  ;-)
>>
>> --
>>
>> Rick C
>
> I don't know why it is confusing.
> "Full speed" always refers to 12Mbps.
> "High speed" always refers to 480Mbps.
> It's quite clear, noone says full speed to 480Mbps, or high speed to 12Mbps..
> Maybe "USB2.0" is confusing, because sometimes a manufacturer doesn't
> support high speed, only full speed, but it may still say "USB2.0".
> However, they specify the max. speed, for example "USB2.0 full speed" :)

I was referring to when 2.0 came out.  Calling the mid speed "full 
speed" is of course confusing if you take the term at all at its face 
value.

-- 

Rick C

Thread

Low-cost low-pin count MCU with USB Host support pozz <pozzugno@gmail.com> - 2016-06-07 00:00 +0200
  Re: Low-cost low-pin count MCU with USB Host support Tim Wescott <seemywebsite@myfooter.really> - 2016-06-06 18:11 -0500
    Re: Low-cost low-pin count MCU with USB Host support pozz <pozzugno@gmail.com> - 2016-06-07 09:04 +0200
      Re: Low-cost low-pin count MCU with USB Host support Jack <jack4747@gmail.com> - 2016-06-07 05:49 -0700
        Re: Low-cost low-pin count MCU with USB Host support pozz <pozzugno@gmail.com> - 2016-06-07 22:59 +0200
      Re: Low-cost low-pin count MCU with USB Host support Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2016-06-07 18:39 +0000
        Re: Low-cost low-pin count MCU with USB Host support Espo <spam@spam.com> - 2016-06-14 21:39 +1000
          Re: Low-cost low-pin count MCU with USB Host support Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2016-06-14 18:09 +0000
            Re: Low-cost low-pin count MCU with USB Host support rickman <gnuarm@gmail.com> - 2016-06-14 16:18 -0400
              Re: Low-cost low-pin count MCU with USB Host support raimond.dragomir@gmail.com - 2016-06-15 04:19 -0700
                Re: Low-cost low-pin count MCU with USB Host support Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP> - 2016-06-15 12:57 +0000
                Re: Low-cost low-pin count MCU with USB Host support Grant Edwards <invalid@invalid.invalid> - 2016-06-15 13:24 +0000
                Re: Low-cost low-pin count MCU with USB Host support raimond.dragomir@gmail.com - 2016-06-15 07:28 -0700
                Re: Low-cost low-pin count MCU with USB Host support Robert Wessel <robertwessel2@yahoo.com> - 2016-06-15 17:46 -0500
                Re: Low-cost low-pin count MCU with USB Host support Grant Edwards <invalid@invalid.invalid> - 2016-06-16 04:59 +0000
                Re: Low-cost low-pin count MCU with USB Host support Robert Wessel <robertwessel2@yahoo.com> - 2016-06-16 11:27 -0500
                Re: Low-cost low-pin count MCU with USB Host support Clifford Heath <no.spam@please.net> - 2016-06-17 09:14 +1000
                Re: Low-cost low-pin count MCU with USB Host support rickman <gnuarm@gmail.com> - 2016-06-16 20:13 -0400
                Re: Low-cost low-pin count MCU with USB Host support Robert Wessel <robertwessel2@yahoo.com> - 2016-06-16 22:57 -0500
                Re: Low-cost low-pin count MCU with USB Host support rickman <gnuarm@gmail.com> - 2016-06-15 10:48 -0400
          Re: Low-cost low-pin count MCU with USB Host support pozz <pozzugno@gmail.com> - 2016-06-15 08:39 +0200

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